| susceptibility of a line of dolphin kidney cell culture to several herpesviruses. | a cell line was established from cell cultures of kidney cortex of a pantropical spotted dolphin, stenella attenuate. the replication of 6 strains of herpesviruses was studied in the cells. five strains of them, herpes simplex virus type i and type ii, equine rhinopneumonitis virus, infectious bovine rhinotracheitis virus and aujeszky's disease virus, were grown fairly well in showing clear cytopathic effects and plaques under agar overlay medium. | 1992 | 1460566 |
| observations of vaginal calculi in dolphins. | vaginal calculi have been described from the common (delphinus delphis), pacific white-sided (lagenorhynchus obliquidens) and spotted (stenella attenuata) dolphins. we describe additional calculi found in six sexually mature d. delphis from southern california. three calculi were large (ca. 7 x 5 cm), exhibited concentric layer crystallization, and were unique from previously published descriptions. one calculus described previously and one in our sample appeared to be a fetal skeleton and skull ... | 1991 | 1920661 |
| [hydrodynamic performance of porpoises (stenella attenuata)]. | two specimens of stenella attenuata, trained to chase a winchtowed lure, reached a top speed of 11.03 meters per second (21.4 knots) in 2.0 seconds. the maximum power output, occurring 1.5 seconds after the start, was calculated from measured values of acceleration and drag coefficient. the maximum power output per unit body weight was 50 percent greater than for human athletes. the measured drag coefficient, obtained from periods of coasting, was approximately the same as that of an equivalent ... | 1966 | 5910195 |
| the lateral enamel lamina--component of tooth primordia in selected mammalian species. | the lateral enamel lamina (lel) is a part of the enamel organ, which is probably not involved in tooth formation. it represents, besides the "stalk" of the tooth primordium, a second interconnection between enamel organ and oral epithelium or vestibular lamina. we detected the lel in the sheep (ovis aries), the dolphin (stenella attenuata), and the vole (microtus agrestis) by light microscopy and computer-aided three-dimensional reconstruction. the lel could be found in cap to bell stage tooth p ... | 2002 | 12494916 |
| heart development in the spotted dolphin (stenella attenuata). | marine mammals show many deviations from typical mammalian characteristics due to their high degree of specialization to the aquatic environment. in cetaceans, some of the features of limbs and dentition resemble very ancestral patterns. in some species, hearts with a clearly bifid apex (a feature normally present during mammalian embryogenesis prior to completion of ventricular septation) have been described. however, there is a scant amount of data regarding heart development in cetaceans, and ... | 2003 | 12845705 |
| distributive and phagocytic characteristics of hepatic macrophages in five cetaceans belonging to delphinidae and ziphiidae. | details of morphology and distribution of hepatic macrophages in cetaceans were investigated using the immunohistochemistry with an antibody (sra-e5) generated against human macrophage scavenger receptor antigen. liver samples were obtained from five species of cetaceans (baird's beaked whales, short-finned pilot whales, risso's dolphins, bottlenose dolphins, and pantropical spotted dolphins). except for two species of whales, the number of sra-e5-positive kupffer cells was greatest in the periv ... | 2004 | 15240942 |
| total mercury, methyl mercury, and selenium levels in the red meat of small cetaceans sold for human consumption in japan. | we surveyed the total mercury (t-hg) and methyl mercury (m-hg) levels in red meat products (n = 160) from small cetacean species sold for human consumption in markets throughout japan from 2000 to 2003. genetic identification showed that the red meat products originated from nine species: false killer whale, bottlenose dolphin, short-finned pilot whale, striped dolphin, rough-toothed dolphin, risso's dolphin, pantropical spotted dolphin, baird's beaked whale, and dall's porpoise. t-hg and m-hg c ... | 2005 | 16124305 |
| patterns of cetacean sighting distribution in the pacific exclusive economic zone of costa rica based on data collected from 1979-2001. | nineteen species of cetaceans (families balaenopteridae, kogiidae, physeteridae, ziphiidae and delphinidae) occur in the costa rican pacific exclusive economic zone (eez). based on data recorded from the eez by the southwest fisheries service center, cascadia research collective, and cimar between 1979-2001, we mapped the distribution of 18 cetacean species. our results suggest that the majority of the cetacean species use primarily oceanic waters, particularly those species within the families ... | 2005 | 17354438 |
| parasites of cetaceans stranded on the pacific coast of costa rica. | information regarding parasitic fauna of cetaceans from costa rica is provided for the first time. a total of 25 stranded dolphins and whales were examined between 2001 and 2009, including striped dolphin (stenella coeruleoalba) (n=19), pantropical spotted dolphin (s. attenuata) (n=2), spinner dolphin (s. longirostris) (n=1), bottlenose dolphin (tursiops truncatus) (n=1), dwarf sperm whale (kogia sima) (n=1) and cuvier's beaked whale (ziphius cavirostris) (n=1). pathological findings associated ... | 2011 | 21665367 |
| historical and current records of aquarium cetaceans in china. | the number of cetaceans housed in aquariums in china is increasing. detailed information on the historical and current population status has not been reported, despite its importance for successful breeding and population management. questionnaires were conducted between december 2006 and may 2009, and the information was used to construct studbooks. our survey showed that 10 species had been introduced to aquariums since 1978, including 26 (with 15 in the current population) finless porpoises ( ... | 2011 | 21674602 |
| cdna-derived amino acid sequences of myoglobins from nine species of whales and dolphins. | we determined the myoglobin (mb) cdna sequences of nine cetaceans, of which six are the first reports of mb sequences: sei whale (balaenoptera borealis), bryde's whale (balaenoptera edeni), pygmy sperm whale (kogia breviceps), stejneger's beaked whale (mesoplodon stejnegeri), longman's beaked whale (indopacetus pacificus), and melon-headed whale (peponocephala electra), and three confirm the previously determined chemical amino acid sequences: sperm whale (physeter macrocephalus), common minke w ... | 2006 | 16962803 |
| automatic classification of delphinids based on the representative frequencies of whistles. | classification of odontocete species remains a challenging task for passive acoustic monitoring. classifiers that have been developed use spectral features extracted from echolocation clicks and whistle contours. most of these contour-based classifiers require complete contours to reduce measurement errors. therefore, overlapping contours and partially detected contours in an automatic detection algorithm may increase the bias for contour-based classifiers. in this study, classification was cond ... | 2015 | 26328716 |
| diffusion tensor imaging of dolphin brains reveals direct auditory pathway to temporal lobe. | the brains of odontocetes (toothed whales) look grossly different from their terrestrial relatives. because of their adaptation to the aquatic environment and their reliance on echolocation, the odontocetes' auditory system is both unique and crucial to their survival. yet, scant data exist about the functional organization of the cetacean auditory system. a predominant hypothesis is that the primary auditory cortex lies in the suprasylvian gyrus along the vertex of the hemispheres, with this po ... | 2015 | 26156774 |
| head morphology in perinatal dolphins: a window into phylogeny and ontogeny. | in this paper on the ontogenesis and evolutionary biology of odontocete cetaceans (toothed whales), we investigate the head morphology of three perinatal pantropical spotted dolphins (stenella attenuata) with the following methods: computer-assisted tomography, magnetic resonance imaging, conventional x-ray imaging, cryo-sectioning as well as gross dissection. comparison of these anatomical methods reveals that for a complete structural analysis, a combination of modern imaging techniques and co ... | 2006 | 17051542 |
| the effect of recording and analysis bandwidth on acoustic identification of delphinid species. | because many cetacean species produce characteristic calls that propagate well under water, acoustic techniques can be used to detect and identify them. the ability to identify cetaceans to species using acoustic methods varies and may be affected by recording and analysis bandwidth. to examine the effect of bandwidth on species identification, whistles were recorded from four delphinid species (delphinus delphis, stenella attenuata, s. coeruleoalba, and s. longirostris) in the eastern tropical ... | 2004 | 15603163 |
| rotation of middle ear ossicles during cetacean development. | cetacean middle ears are unique among mammals in that they have an elongated tympanic membrane, a greatly reduced manubrium mallei, and an incudal crus longum that is shorter than the crus breve. elongation of the tympanic membrane and reduction of the manubrium is thought to be related to an evolutionary rotation of the incus and malleus out of the plane of the tympanic membrane. we examined if rotation also occurs during ontogeny by comparing the middle ears of two species of dolphins (delphin ... | 2001 | 11466740 |
| prenatal development of the integument in delphinidae (cetacea: odontoceti). | the prenatal development of epidermis, dermis, and hypodermis was studied in embryos of different age of two delphinid species (stenella attenuata, delphinus delphis), using light and transmission electron microscopical methods. the delphinid embryo is covered by a multilayered tissue formed by four different epidermal generations (periderm, stratum intermedium-i, str. intermedium-ii, str. spinosum) produced by the str. basale. the first layer appears at about 40-50 mm of body length, the second ... | 1995 | 7714905 |
| vaginal calculi in the dolphin. | examination of the reproductive tract of a mature spotted dolphin, stenella attenuata , revealed 13 vaginal calculi, composed primarily of calcium phosphate compounds. vaginal calculi also were found in two mature lagenorhynchus obliquidens and in six mature delphinus delphis . | 1977 | 24228951 |
| role of crassicauda sp. in natural mortality of pantropical spotted dolphins stenella attenuata: a reassessment. | evaluating the effect of parasites on population size is essential for designing management and conservation plans of wild animal populations. although knowledge in this area is scarce in cetaceans, current evidence suggests that species of the nematode genus crassicauda may play an important regulatory role in some populations. in the present study, a semiparametric regression technique was applied to a previously published dataset to re-examine the role of crassicauda sp. in natural mortality ... | 2014 | 24492057 |
| annotated checklist and fisheries interactions of cetaceans in togo, with evidence of antarctic minke whale in the gulf of guinea. | based on strandings and captures, 9 cetacean species, including 6 odontocetes and 3 mysticetes, are documented (photos and specimens) in togo's coastal waters (newly-recorded species marked with an asterisk): antarctic minke whale (balaenoptera bonaerensis*), bryde's whale (balaenoptera brydei or b. edeni), humpback whale (megaptera novaeangliae), sperm whale (physeter macrocephalus), pygmy sperm whale (kogia breviceps*), short-finned pilot whale (globicephala macrorhynchus*), pantropical spotte ... | 2014 | 24447657 |
| trophic relationships and habitat preferences of delphinids from the southeastern brazilian coast determined by carbon and nitrogen stable isotope composition. | to investigate the foraging habitats of delphinids in southeastern brazil, we analyzed stable carbon (δ(13)c) and nitrogen (δ(15)n) isotopes in muscle samples of the following 10 delphinid species: sotalia guianensis, stenella frontalis, tursiops truncatus, steno bredanensis, pseudorca crassidens, delphinus sp., lagenodelphis hosei, stenella attenuata, stenella longirostris and grampus griseus. we also compared the δ(13)c and δ(15)n values among four populations of s. guianensis. variation in ca ... | 2013 | 24358155 |
| cytochrome p4501a1 expression in blubber biopsies of endangered false killer whales (pseudorca crassidens) and nine other odontocete species from hawai'i. | odontocetes (toothed whales) are considered sentinel species in the marine environment because of their high trophic position, long life spans, and blubber that accumulates lipophilic contaminants. cytochrome p4501a1 (cyp1a1) is a biomarker of exposure and molecular effects of certain persistent organic pollutants. immunohistochemistry was used to visualize cyp1a1 expression in blubber biopsies collected by non-lethal sampling methods from 10 species of free-ranging hawaiian odontocetes: short-f ... | 2014 | 25134676 |
| histological, immunohistochemical and pathological features of the pituitary gland of odontocete cetaceans from the western gulf of mexico. | pituitary glands were recovered from dolphins and small whales found stranded along the texas coast of the gulf of mexico over a 15-year period (1991-2006). one hundred animals of 14 species were found to be suitable for inclusion in this study. of these, 72 were atlantic bottlenose dolphins (tursiops truncatus). other species included were the melon-headed whale (peponocephala electra), spinner dolphin (stenella longirostris), striped dolphin (stenella coeruleoalba), pantropical spotted dolphin ... | 2008 | 18621384 |
| a tool for real-time acoustic species identification of delphinid whistles. | the ability to identify delphinid vocalizations to species in real-time would be an asset during shipboard surveys. an automated system, real-time odontocete call classification algorithm (rocca), is being developed to allow real-time acoustic species identification in the field. this matlab-based tool automatically extracts ten variables (beginning, end, minimum and maximum frequencies, duration, slope of the beginning and end sweep, number of inflection points, number of steps, and presence/ab ... | 2007 | 17614515 |
| morphologic characteristics of pulmonary macrophages in cetaceans: particular reference to pulmonary intravascular macrophages as a newly identified type. | we examined the morphologic characteristics of pulmonary macrophages in 42 specimens of odontoceti (globicephala macrorhynchus, grampus griseus, tursiops truncatus, stenella attenuata, stenella coeruleoalba, berardius bairdii), using light and electron microscopes as well as immunohistochemistry with sra-e5. sra-e5-positive alveolar macrophages and pulmonary interstitial macrophages contained graphitic soots, indicating the clearance of airborne, aspirated foreign bodies. pulmonary intravascular ... | 2004 | 15557077 |
| morphology of the complex laryngeal gland in the atlantic bottlenose dolphin, tursiops truncatus. | a complex lymphoepithelial gland is a constant feature in the larynx of atlantic bottlenose dolphins, tursiops truncatus, based on study of 56 animals. larynges were removed from fresh, non-decomposed beach-stranded animals for gross examination and histological sampling. a large lymphoepithelial gland occurs in the rostro-ventral mucosa of the larynx, overlying the cricoid cartilage. it presents as a well-defined, elevated, and heavily trabeculated area. histological examination reveals a pseud ... | 1999 | 9892423 |
| melanin granules melanophages and a fully-melanized epidermis are common traits of odontocete and mysticete cetaceans. | the cellular mechanisms used to counteract or limit damage caused by exposure of marine vertebrates to solar ultraviolet (uv) radiation are poorly understood. cetaceans are vulnerable because they lack protective skin appendages and are obliged to surface continuously to breathe, thus being exposed repeatedly to uv light. although molecular mechanisms of photoprotection of cetaceans have been studied, there is limited knowledge about their epidermal structure and photoprotective effectors. | 2017 | 27943433 |
| investigation of trophic level and niche partitioning of 7 cetacean species by stable isotopes, and cadmium and arsenic tissue concentrations in the western pacific ocean. | a total of 24 stranded or bycatch cetaceans, including balaenoptera omurai, lagenodelphis hosei, kogia sima, stenella attenuata, grampus griseus, neophocaena phocaenoides, and sousa chinensis, were collected from 2001 to 2011 in taiwan. using the muscular δ(13)c and δ(15)n data, three ecological groups were identified as the oceanic baleen whale, the neritic, and the coastal toothed whale groups, coinciding with their taxonomy, feeding habits and geographical distribution. a horizontal inshore t ... | 2015 | 25684592 |
| accumulation of organotin compounds in tissues and organs of dolphins from the coasts of thailand. | the concentration of organotin (ot) in seven species of dolphin (bottlenose dolphin, finless porpoise, indo-pacific humpbacked dolphin, long-beaked common dolphin, pantropical spotted dolphin, spinner dolphin, and striped dolphin), which were stranded on the coasts of thailand, were measured. butyltin (bt) and phenyltin (pt) compounds in tissues and organs of the dolphins were in the range of 16-1,152 microg kg(-1) and <1-62 microg kg(-1), respectively. the highest concentration of tributyltin ( ... | 2008 | 17687583 |
| complete amino acid sequence of the myoglobin from the pacific spotted dolphin, stenella attenuata graffmani. | the complete amino acid sequence of the major component myoglobin from the pacific spotted dolphin, stenella attenuata graffmani, was determined by the automated edman degradation of several large peptides obtained by specific cleavage of the protein. the acetimidated apomyoglobin was selectively cleaved at its two methionyl residues with cyanogen bromide and at its three arginyl residues by trypsin. by subjecting four of these peptides and the apomyoglobin to automated edman degradation, over 8 ... | 1979 | 454657 |
| tissue concentrations of four taiwanese toothed cetaceans indicating the silver and cadmium pollution in the western pacific ocean. | muscle, lung, kidney and liver tissues of 45 bycatch and stranded cetaceans, including 14 grampus griseus (gg), 7 kogia simus (ks), 10 lagenodelphis hosei (lh), and 14 stenella attenuata (sa), were collected in the waters off taiwan from 1994 to 1995, and from 2001 to 2012. baseline concentrations (in μgg(-1) dry weight) of the cetaceans were lung (<0.05)=muscle (<0.05)<kidney (0.08±0.04)<liver (0.43±0.28) for ag, and muscle (0.03±0.03)=lung (0.22±0.19)<liver (3.82±3.50)<kidney (16.22±18.81) for ... | 2017 | 28442199 |
| delphinid echolocation click detection probability on near-seafloor sensors. | the probability of detecting echolocating delphinids on a near-seafloor sensor was estimated using two monte carlo simulation methods. one method estimated the probability of detecting a single click (cue counting); the other estimated the probability of detecting a group of delphinids (group counting). echolocation click beam pattern and source level assumptions strongly influenced detectability predictions by the cue counting model. group detectability was also influenced by assumptions about ... | 2016 | 27914405 |
| mercury, organic-mercury and selenium in small cetaceans in taiwanese waters. | total hg (sigmahg), organic-hg (o-hg) and se bioaccumulations in small cetaceans distributed in taiwanese waters of the taiwan strait and the southwestern pacific have been investigated for the first time. the results could represent the baseline metal concentrations of marine mammals in the southwestern pacific, where volcanic activities are possibly the major source of mercury to the environments. muscle samples of four species of small cetaceans were collected from animals accidentally caught ... | 2002 | 12398391 |
| cytochrome p450 1a1 expression in cetacean skin biopsies from the indian ocean. | the study describes cytochrome p450 1a1 (cypa1) expression in the skin of different cetacean species (megaptera novaeangliae, n=15; stenella attenuata, n=7 and stenella longirostris, n=24) from the mozambique channel island of mayotte. immunohistochemical examination was performed with a monoclonal antibody against scup cytochrome cypa1. the sex was determined using a molecular approach consisting in the genotyping sex-specific genes. cypa1 was detected at the junction between epidermis and blub ... | 2011 | 21565363 |
| [inshore cetaceans from the north and south pacific coast of costa rica]. | twenty nine cetacean species occur in costa rican waters but extensive research has been conducted only for three species. the latter shows there is a lack of general and local information about these mammals, even when the country, has shown a remarkable growth in whale watching activities. the increasing use of marine resources in coastal areas has also developed the need to determine the occurrence of cetaceans in areas showing high tourist presence, in order to propose sound conservation mea ... | 2011 | 21516651 |
| multiple populations of pantropical spotted dolphins in hawaiian waters. | understanding gene flow and dispersal patterns is important for predicting effects of natural events and anthropogenic activities on animal populations. in hawaii, most species of odontocetes are managed as single populations. recent exceptions include false killer whales, spinner dolphins, and common bottlenose dolphins, for which studies have shown fidelity to individual islands or groups of islands. our study focused on pantropical spotted dolphins. we analyzed mitochondrial control region an ... | 2014 | 25124812 |
| whistle characteristics and daytime dive behavior in pantropical spotted dolphins (stenella attenuata) in hawai'i measured using digital acoustic recording tags (dtags). | this study characterizes daytime acoustic and dive behavior of pantropical spotted dolphins (stenella attenuata) in hawai'i using 14.58 h of data collected from five deployments of digital acoustic recording tags (dtag3) in 2013. for each tagged animal, the number of whistles, foraging buzzes, dive profiles, and dive statistics were calculated. start, end, minimum, and maximum frequencies, number of inflection points and duration were measured from 746 whistles. whistles ranged in frequency from ... | 2016 | 27475166 |
| resumption of traditional drive hunting of dolphins in the solomon islands in 2013. | the 'drive hunting' of dolphins has a long history in the solomon islands, specifically at the island of malaita. in 2010, the most active village, fanalei, suspended hunting in exchange for financial compensation from an international non-governmental organization but resumed hunting again in early 2013. here, we report on a visit to fanalei in march 2013 to document the species and number of dolphins killed in the renewed hunting. detailed records for the 2013 hunting, up to the time of our vi ... | 2015 | 26064656 |
| development of the skull of the pantropical spotted dolphin (stenella attenuata). | we describe the bony and cartilaginous structures of five fetal skulls of stenella attenuata (pantropical spotted dolphin) specimens. the specimens represent early fetal life as suggested by the presence of rostral tactile hairs and the beginnings of skin pigmentation. these specimens exhibit the developmental order of ossification of the intramembranous and endochondral elements of the cranium as well as the functional and morphological development of specific cetacean anatomical adaptations. d ... | 2011 | 21901843 |
| cranial variation in the pantropical spotted dolphin, stenella attenuata , in the pacific ocean. | cranial variation in 129 pantropical spotted dolphins (stenella attenuata) from the western and eastern tropical pacific was investigated morphometrically. this study revealed significant sexual dimorphism in the dolphin skulls. differences between the genders were mostly recorded in the rostrum and braincase, which are wider and more robust in males. this sexual variation was interpreted in terms of differences in behavioral and life-history strategies between genders. geographical variation am ... | 2008 | 19267651 |
| a morphological and histological examination of the pan-tropical spotted dolphin (stenella attenuata) and the spinner dolphin (stenella longirostris) adrenal gland. | the morphology and histology of the cetacean adrenal gland are poorly understood. therefore, this study examined 32 pairs of adrenal glands from 18 pan-tropical spotted dolphins (stenella attenuata) and 14 spinner dolphins (stenella longirostris). in both species, the cortex was pseudolobulated and contained a typical mammalian zonation. medullary protrusions (0-3 per section) and a medullary band were identified in both species. for s. attenuata, no statistical differences were found in the cor ... | 2008 | 18070242 |
| [distribution and environmental conditions related to the behavior in the bottlenose dolphin (tursiops truncatus) and the spotted dolphin (stenella attenuata) (cetacea: delphinidae) in golfo dulce, costa rica]. | habitat characteristics influencing behavior in animal species vary locally. the influence that a particular environmental characteristic can have on a species depends not only on other variables, but on morphological, physiological and social conditions of that species. in this study, developed from june 1996 to july 1997, i studied whether specific behaviors are related to particular distribution areas and environmental factors in the bottlenose (tursiops truncatus) and the spotted dolphin (st ... | 2007 | 19069765 |
| [sighting of stenella attenuata, the spotted dolphin, in culebra bay, costa rica, 1999-2000]. | parallel to a zooplankton study (1999-2000) observations were made (from an inflatable boat), on the presence of dolphins along a transect (-8 km long) on the axis of culebra bay (24 km2), gulf of papagayo, pacific coast of costa rica. dolphins were found during 20 of the 31 boat surveys conducted. the only species of cetacean found in the bay was stenella attenuata, the spotted dolphin. these sightings were more frequent during the rainy season, particularly during the month of may of both year ... | 2004 | 17465137 |
| [occurrence and behavioral patterns of the spotted coastal dolphin stenella attenuata (cetacea: delphinidae) in the gulf of papagayo, costa rica]. | dolphins are characterized by a significant behavioral versatility, which allows them to respond to environmental seasonality. seasonal variation in dolphin behavior in tropical waters is not well known. stenella attenuata graffmani is a resident dolphin in the clearly defined seasonal gulf of papagayo, costa rica, and we studied if dolphin group size, occurrence and behavioral patterns were associated with season and time of day in the gulf. using strip transects we surveyed two locations for t ... | 2007 | 17354439 |
| levels of organochlorine compounds in spotted dolphins from the coiba archipelago, panama. | blubber and skin samples from 63 spotted dolphins (stenella attenuata) (18 males, 40 females and 5 of unknown sex) were collected by biopsy techniques in the waters of the coiba archipelago. blubber was analyzed for organochlorine compounds and skin for gender determination. mean levels of hcb (hexachlorobenzene), tpcb (polychlorinated biphenyls) and tddt (dichlorodiphenyltrichloroethane) were 0.064, 2.30 and 6.4 mgkg(-1), respectively. these levels are low and are not considered to represent a ... | 2004 | 14599513 |
| time, pattern, and heterochrony: a study of hyperphalangy in the dolphin embryo flipper. | the forelimb of whales and dolphins is a flipper that shows hyperphalangy (numerous finger bones). hyperphalangy is also present in marine reptiles, including ichthyosaurs and plesiosaurs. the developmental basis of hyper-phalangy is unclear. kükenthal suggested that phalanx anlagen split into three pieces during cetacean development, thereby multiplying the ancestral number. alternatively, holder suggested that apical ectodermal ridge (aer)-directed limb outgrowth might be prolonged by a timing ... | 2007 | 12492144 |
| on the development of cetacean extremities: ii. morphogenesis and histogenesis of the flippers in the spotted dolphin (stenella attenuata). | externally, the flippers of cetacea resemble fish fins, but their internal structure is entirely mammalian. they show, however, some adaptative deviations from the typical pattern of the mammalian extremities, the most striking of which is an increased number of phalanges. the aim of this study is to describe the course of the development of flippers in the spotted dolphin (stenella attenuata) and compare its features with other similar species from an evolutionary perspective. early stages of f ... | 1997 | 9253589 |
| on the development of cetacean extremities: i. hind limb rudimentation in the spotted dolphin (stenella attenuata). | the cetacea are group of animals which have completely lost their hind limbs during the course of evolution as a result of their entirely aquatic mode of life. it is known, however, that during their embryonal period, the hind limb buds are temporarily present. the control mechanisms of this regression are not yet understood, and vestigial limbs can sometimes be found in adults. the aim of the present study is to describe the course of hind limb rudimentation during prenatal development of stene ... | 1997 | 9143876 |
| [development of the vestibular apparatus in a representative of aquatic mammals, stenella attenuata]. | | 1996 | 8768125 |
| cadmium contamination of tissues and organs of delphinids species (stenella attenuata)--influence of biological and ecological factors. | based on a sample of 27 dolphins (stenella attenuata) captured in the eastern tropical zone of the pacific ocean, this study was carried out to analyze the cadmium accumulation levels and distribution in 12 organs or tissue samples. the average cadmium concentrations were between 0.2 mg cd.kg-1 in the brain and muscle and 48 mg cd.kg-1 in the kidneys. for most of organs and tissues the average values were between 1 and 5 mg cd.kg-1. kidneys, liver, muscle, and intestine contained almost 85% of t ... | 1990 | 2090444 |
| terminal airway embryology of the delphinid porpoises, stenella attenuata and s. longirostris. | a light microscopic investigation of the histological development of the terminal airways of 18 stenella attenuata and two s. longirostris showed the lungs to be in a glandular stage of development until 3 months postimplantation (p.i.) age. by 3.5 months (p.i.) the lung was at the canalicular stage. at 4 months mesenchymal rings and muscular bands were in a sphincterlike arrangement around terminal bronchioles. at 7 months (p.i.) the alveolar stage occurred. about 8-9 months cartilaginous rings ... | 1983 | 6842612 |
| chromosomal variation and constitutive heterochromatin in three porpoise species (genus stenella). | chromosomes from cultured fibroblasts of two pacific porpoise species, stenella attenuata and s. longirostris, and one atlantic species, s. dubia, were compared to test the feasibility of using variation in constitutive heterochromatin and other chromosomal characteristics for analyses of population relationships and defining stocks of endangered porpoises. the g-band karyotypes of the three species were identical except for minor band differences resulting from heterochromatin variation. the nu ... | 1981 | 7307585 |
| on the panniculus carnosus of the bridled dolphin (stenella frontalis). | | 1971 | 5142550 |