| function of the heterocercal tail in sharks: quantitative wake dynamics during steady horizontal swimming and vertical maneuvering. | the function of the heterocercal tail in sharks has long been debated in the literature. previous kinematic data have supported the classical theory which proposes that the beating of the heterocercal caudal fin during steady horizontal locomotion pushes posteroventrally on the water, generating a reactive force directed anterodorsally and causing rotation around the center of mass. an alternative model suggests that the heterocercal shark tail functions to direct reaction forces through the cen ... | 2002 | 12124362 |
| orectolobicestus n. g. (cestoda: tetraphyllidea), with the description of five new species and the transfer of phyllobothrium chiloscyllii to the new genus. | orectolobicestus n. g. (cestoda: tetraphyllidea) is erected for six cestode species parasitising bamboo sharks (orectolobiformes: chiloscyllium). members of this genus differ from all other phyllobothriid genera in possessing modified maisiform spinitriches on their distal bothridial surfaces. in addition, they are easily recognised in that they share the following unique combination of characters: their vitelline fields are interrupted by the ovary, their necks are scutellate, and their bothrid ... | 2006 | 16955338 |
| seven new yorkeria species (cestoda: tetraphyllidea) from borneo and australia and their implications for identification of chiloscyllium (elasmobranchii: orectolobiformes) species. | new material of yorkeria southwell, 1927, collected from chiloscyllium müller & henle species, i.e., bamboo sharks, from malaysian borneo and eastern australia was found to include specimens that appear to be consistent with, and thus allow redescription of, the poorly characterized type of the genus, yorkeria parva southwell, 1927, as well as 7 new species of tetraphyllidean cestodes from the genus yorkeria. discovered in borneo were y. parva and yorkeria teeveeyi n. sp. from chiloscyllium indi ... | 2007 | 17539421 |
| a new tetraphyllidean genus and species, caulopatera pagei n. g., n. sp. (tetraphyllidea: phyllobothriidae), from the grey carpetshark chiloscyllium punctatum müller & henle (orectolobiformes: hemiscylliidae). | a new genus and species of tetraphyllidean cestode, caulopatera pagei n. g., n. sp., is described from the grey carpetshark chiloscyllium punctatum müller & henle in moreton bay, australia. the new genus is placed in the phyllobothriidae, subfamily phyllobothriinae. caulopatera n. g. is distinct from all other phyllobothriine genera in having stalked, circular, non-loculate bothridia that lack an apical sucker, testes that are restricted to the region anterior to the cirrus-sac and circum-medull ... | 2010 | 20700693 |
| cross matching of blood in carcharhiniform, lamniform, and orectolobiform sharks. | the transfusion of whole blood in elasmobranchs could provide cardiovascular support following hemorrhage. since donor and recipient compatibility is not known, a technique was established to allow cross matching of red blood cells and serum in sharks. cross matching was carried out among 19 individuals from seven species: the nurse shark (ginglymostoma cirratum), sandbar shark (carcharhinus plumbeus), sandtiger shark (carcharias taurus), white-spotted bamboo shark (chiloscyllium plagiosum), bro ... | 2010 | 20945647 |
| retinal ganglion cell distribution and spatial resolving power in elasmobranchs. | the total number, distribution and peak density of presumed retinal ganglion cells was assessed in 10 species of elasmobranch (nine species of shark and one species of batoid) using counts of nissl-stained cells in retinal wholemounts. the species sampled include a number of active, predatory benthopelagic and pelagic sharks that are found in a variety of coastal and oceanic habitats and represent elasmobranch groups for which information of this nature is currently lacking. the topographic dist ... | 2008 | 18679025 |
| evolutionary history of the enolase gene family. | the enzyme enolase [ec 4.2.1.11] is found in all organisms, with vertebrates exhibiting tissue-specific isozymes encoded by three genes: alpha (alpha), beta (beta), and gamma (gamma) enolase. limited taxonomic sampling of enolase has obscured the timing of gene duplication events. to help clarify the evolutionary history of the gene family, cdnas were sequenced from six taxa representing major lineages of vertebrates: chiloscyllium punctatum (shark), amia calva (bowfin), salmo trutta (trout), la ... | 2000 | 11163970 |
| inter- and intraspecific variation in the distribution and number of pit organs (free neuromasts) of sharks and rays. | the distribution of pit organs (free neuromasts) has previously been documented for several species of pelagic sharks, but is relatively poorly known for rays and bottom-dwelling (demersal) sharks. in the present study, the complete distribution of pit organs was mapped in the demersal sharks heterodontus portusjacksoni, orectolobus maculatus, hemiscyllium ocellatum, chiloscyllium punctatum, and asymbolus analis, and the rays rhinobatos typus, aptychotrema rostrata, trygonorrhina sp. a, raja sp. ... | 2003 | 12616576 |
| a revision of the family dissonidae kurtz, 1924 (copepoda: siphonostomatoida). | two new species of the parasitic copepod genus dissonus wilson, 1906 are described: d. excavatus n. sp. from the gills of a labrid, bodianus perditio, and a lutjanid, macolor niger, collected off new caledonia and taiwan, and d. inaequalis n. sp. from a hemiscylliid elasmobranch, chiloscyllium punctatum, collected off sarawak (malaysia) and the philippines. material of d. heronensis kabata, 1966 is described from a balistid host, pseudobalistes fuscus, off new caledonia, and this constitutes a n ... | 2008 | 18427956 |
| the directional hearing abilities of two species of bamboo sharks. | auditory evoked potentials (aeps) were used to measure the directional hearing thresholds of the white-spotted bamboo shark chiloscyllium plagiosum and the brown-banded bamboo shark chiloscyllium punctatum at four frequencies and seven directions, using a shaker table designed to mimic the particle motion component of sound. over most directions and frequencies there were no significant differences in acceleration thresholds, suggesting that the sharks have omni-directional hearing abilities. go ... | 2007 | 17234620 |
| electrophysiological measures of temporal resolution, contrast sensitivity and spatial resolving power in sharks. | in most animals, vision plays an important role in detecting prey, predators and conspecifics. the effectiveness of vision in assessing cues such as motion and shape is influenced by the ability of the visual system to detect changes in contrast in both space and time. understanding the role vision plays in shark behaviour has been limited by a lack of knowledge about their temporal resolution, contrast sensitivity and spatial resolution. in this study, an electrophysiological approach was used ... | 2017 | 28247014 |
| visual resolution and contrast sensitivity in two benthic sharks. | sharks have long been described as having 'poor' vision. they are cone monochromats and anatomical estimates suggest they have low spatial resolution. however, there are no direct behavioural measurements of spatial resolution or contrast sensitivity. this study estimates contrast sensitivity and spatial resolution of two species of benthic sharks, the port jackson shark, heterodontus portusjacksoni, and the brown-banded bamboo shark, chiloscyllium punctatum, by recording eye movements in respon ... | 2016 | 27802139 |
| morphology and distribution of taste papillae and oral denticles in the developing oropharyngeal cavity of the bamboo shark, chiloscyllium punctatum. | gustation in sharks is not well understood, especially within species that ingest food items using suction. this study examines the morphological and immunohistochemical characterisation of taste papillae and oral denticles in the oropharynx of the brown-banded bamboo shark chiloscyllium punctatum and compares their distribution during development. taste papillae of c. punctatum are located throughout the oropharyngeal region and are most concentrated on the oral valves (2125-3483 per cm(2) in e ... | 2016 | 27797725 |
| osmoregulation by juvenile brown-banded bamboo sharks, chiloscyllium punctatum, in hypo- and hyper-saline waters. | while there is a considerable body of work describing osmoregulation by elasmobranchs in brackish and saltwater, far fewer studies have investigated osmoregulation in hypersaline waters. we examined osmo- and ionoregulatory function and plasticity in juvenile brown-banded bamboo sharks, chiloscyllium punctatum, exposed to three experimental salinities (25, 34 and 40‰) for two weeks. c. punctatum inhabits sheltered coastal areas and bays which can naturally become hypersaline as a consequence of ... | 2015 | 25868436 |
| species composition and aspects of the biology of orectolobiformes from indonesian waters. | the biological aspects of members of the order orectolobiformes exploited in indonesian waters are given. seven species belonging to five families were recorded in the catches at various landing sites in southern indonesia. of these, chiloscyllium punctatum was the most abundant species landed, contributing >50% of the number of orectolobiforms recorded. the biological data obtained varied greatly between the species listed. the total length (lt ) at maturity for some species, e.g. c. punctatum ... | 2014 | 25546571 |
| long-term sperm storage in the brownbanded bamboo shark chiloscyllium punctatum. | this study investigated the birth of a brownbanded bamboo shark chiloscyllium punctatum at the steinhart aquarium. genetic analyses suggest this is the longest documented case of sperm storage for any species of shark (45 months). | 2015 | 25545440 |
| early-life exposure to climate change impairs tropical shark survival. | sharks are one of the most threatened groups of marine animals worldwide, mostly owing to overfishing and habitat degradation/loss. although these cartilaginous fish have evolved to fill many ecological niches across a wide range of habitats, they have limited capability to rapidly adapt to human-induced changes in their environments. contrary to global warming, ocean acidification was not considered as a direct climate-related threat to sharks. here we show, for the first time, that an early on ... | 2014 | 25209942 |
| ontogenetic changes in retinal ganglion cell distribution and spatial resolving power in the brown-banded bamboo shark chiloscyllium punctatum (elasmobranchii). | the development of the visual system in anamniotic vertebrates is a continual process, allowing for ontogenetic changes in retinal topography and spatial resolving power. we examined the number and distribution of retinal ganglion cells in wholemounted retinae throughout the protracted embryonic development (∼5 months) of a chondrichthyan, i.e. the brown-banded bamboo shark chiloscyllium punctatum, from the beginning of retinal cell differentiation (approximately halfway through embryogenesis) t ... | 2014 | 24993335 |
| dollfusiella campbell & beveridge, 1994 (trypanorhyncha: eutetrarhynchidae) from elasmobranchs off borneo, including descriptions of five new species. | sampling of a large number of elasmobranchs from coastal waters off borneo revealed the presence of five new species of dollfusiella campbell & beveridge, 1994 (trypanorhyncha: eutetrarhynchidae), namely d. angustiformis n. sp., d. hemispinosa n. sp., d. spinosa n. sp., d. imparispinis n. sp. and d. parva n. sp. dollfusiella angustiformis n. sp. is described from the spiral intestines of four species of the dasyatid stingray genus himantura müller & henle from both the indonesian and malaysian p ... | 2013 | 23949646 |
| characterization of the trunk neural crest in the bamboo shark, chiloscyllium punctatum. | the neural crest is a population of mesenchymal cells that after migrating from the neural tube gives rise to structure and cell types: the jaw, part of the peripheral ganglia, and melanocytes. although much is known about neural crest development in jawed vertebrates, a clear picture of trunk neural crest development for elasmobranchs is yet to be developed. here we present a detailed study of trunk neural crest development in the bamboo shark, chiloscyllium punctatum. vital labeling with dioct ... | 2013 | 23640803 |
| poecilorhynchus perplexus n. g., n. sp. (trypanorhyncha: eutetrarhynchidae) from the brownbanded bambooshark, chiloscyllium punctatum müller & henle, from australia. | a new genus of trypanorhynch cestodes is described from the brownbanded bambooshark, chiloscyllium punctatum müller & henle (hemiscylliidae) from off nickol bay, western australia. poecilorhynchus perplexus n. g., n. sp. is placed in the eutetrarhynchidae guiart, 1927 because it is characterised by an elongate, acraspedote scolex with two oval bothria, the absence of bothrial pits, elongate bulbs, the presence of gland-cells within the bulbs and prebulbar organs, retractor muscles inserting at t ... | 2013 | 23595487 |
| complete mitochondrial genome of the brownbanded bamboo shark chiloscyllium punctatum. | the complete mitochondrial genome of the brownbanded bamboo shark chiloscyllium punctatum was obtained for the first time in this study. the mitogenome is 16,703 bp in length, containing 13 protein-coding genes, 2 rrna genes, 22 trna genes and one control region. the gene order and direction of transcription of c. punctatum is identical to most vertebrates. the strong codon usage bias against the g was found in the third codon positions of h-strand-encoded protein genes. the trna-ser2 lost dihyd ... | 2014 | 23594278 |
| survival of the stillest: predator avoidance in shark embryos. | sharks use highly sensitive electroreceptors to detect the electric fields emitted by potential prey. however, it is not known whether prey animals are able to modulate their own bioelectrical signals to reduce predation risk. here, we show that some shark (chiloscyllium punctatum) embryos can detect predator-mimicking electric fields and respond by ceasing their respiratory gill movements. despite being confined to the small space within the egg case, where they are vulnerable to predators, emb ... | 2013 | 23326342 |
| the onset of goiter in several species of sharks following the addition of ozone to a touch pool. | this report describes the onset of goiter in several species of shark following the addition of ozone to a touch pool. a detailed description of a female brown-banded bamboo shark (chiloscyllium punctatum) that was presented with multinodular goiter is provided. four other brown-banded bamboo sharks and 11 white-spotted bamboo sharks (chiloscyllium plagiosum) housed in the same system developed clinical disease consistent with goiter, but two zebra bullhead sharks (heterodontus zebra) did not. p ... | 2012 | 23082528 |
| a new species of tetraphyllidean (onchobothriidae) cestode from the brown-banded bambooshark chiloscyllium punctatum (elasmobranchii: hemiscylliidae). | yorkeria chonburiensis n. sp. (tetraphyllidea: onchobothriidae) is described from the spiral intestine of a specimen of the brownbanded bamboo shark, chiloscyllium punctatum, collected from the gulf of thailand, chon buri province, thailand. yorkeria chonburiensis n. sp. is distinguished from all other species of yorkeria by the pattern of proglottids (craspedote as opposed to acraspedote) and the proglottid number (more than 168). the new species is larger than all other members of yorkeria, an ... | 2012 | 22681175 |
| optimal preservation of the shark retina for ultrastructural analysis: an assessment of chemical, microwave, and high-pressure freezing fixation techniques. | recent advances in microwave chemical fixation (mcf) and/or high pressure freezing (hpf) combined with transmission electron microscopy have resulted in superior ultrastructural detail in a variety of tissue types. to date, selachian tissue has been fixed and processed using only standard chemical fixation (cf) methods, and the resulting ultrastructure has been less than ideal. in this study, we compared the ultrastructure of the fragile retinal tissue from the brown banded bamboo shark, chilosc ... | 2012 | 22581713 |
| three new species of spiniloculus (cestoda: tetraphyllidea) from chiloscyllium punctatum (elasmobranchii: orectolobiformes) off borneo with clarification of the identity of the type of the genus. | the type species (spiniloculus mavensis southwell, 1925) of the previously monotypic tetraphyllidean genus spiniloculus southwell, 1925 is redescribed from the type material from moreton bay, australia. as a consequence the identity of this species is definitively resolved. three new species in the genus, all collected from chiloscyllium punctatum müller et henle (brownbanded bambooshark), in borneo, are described. spiniloculus calhouni sp. n. conspicuously differs from all three of its congener ... | 2011 | 21539139 |
| the physiological tolerance of the grey carpet shark (chiloscyllium punctatum) and the epaulette shark (hemiscyllium ocellatum) to anoxic exposure at three seasonal temperatures. | the epaulette shark (hemiscyllium ocellatum) and the grey carpet shark (chiloscyllium punctatum) are commonly found in periodically hypoxic environments. the ecophysiological time available for these animals to safely exploit these niches during different seasonal temperatures was examined. the time to loss of righting reflex (t (lrr)) was examined in response to an open ended anoxic challenge at three seasonal temperatures (23, 25 and 27°c). ventilation rates were measured in an open ended anox ... | 2011 | 20922566 |
| embryonic development of glial cells and myelin in the shark, chiloscyllium punctatum. | glial cells are responsible for a wide range of functions in the nervous system of vertebrates. the myelinated nervous systems of extant elasmobranchs have the longest independent history of all gnathostomes. much is known about the development of glia in other jawed vertebrates, but research in elasmobranchs is just beginning to reveal the mechanisms guiding neurodevelopment. this study examines the development of glial cells in the bamboo shark, chiloscyllium punctatum, by identifying the expr ... | 2009 | 19733690 |
| hematological responses of the grey carpet shark (chiloscyllium punctatum) and the epaulette shark (hemiscyllium ocellatum) to anoxia and re-oxygenation. | we compared the hematological responses of wild and captive populations of two closely related sharks to a standardized anoxic challenge and during a 12 hr recovery period in normoxia: the epaulette shark (hemiscyllium ocellatum, bonnaterre, 1788) and the grey carpet shark (chiloscyllium punctatum, müller and henle, 1838). compared to normoxic controls, a significant increase in hematocrit (captive 22.3%; wild 35.9%) coupled with a decline in mean corpuscular hemoglobin concentration occurred in ... | 2009 | 19405134 |
| turning maneuvers in sharks: predicting body curvature from axial morphology. | given the diversity of vertebral morphologies among fishes, it is tempting to propose causal links between axial morphology and body curvature. we propose that shape and size of the vertebrae, intervertebral joints, and the body will more accurately predict differences in body curvature during swimming rather than a single meristic such as total vertebral number alone. we examined the correlation between morphological features and maximum body curvature seen during routine turns in five species ... | 2009 | 19248153 |
| retinal neurogenesis and ontogenetic changes in the visual system of the brown banded bamboo shark, chiloscyllium punctatum (hemiscyllidae, elasmobranchii). | the development of the eye of the oviparous brown banded bamboo shark, chiloscyllium punctatum, was monitored from egg deposition through adulthood. the order and timing of retinal cell differentiation were assessed by light and transmission electron microscopy. as in other vertebrates, the ganglion cells are the first to differentiate, in this case by 81 days post-egg deposition (dpd). the order then deviates from what is typically quoted for vertebrates, with the müller and amacrine cells diff ... | 2009 | 19107847 |
| cloning and characterization of a type 3 iodothyronine deiodinase (d3) in the liver of the chondrichtyan chiloscyllium punctatum. | thyroid hormone bioactivity is finely regulated at the cellular level by the peripheral iodothyronine deiodinases (d). the study of thyroid function in fish has been restricted mainly to teleosts, whereas the study and characterization of ds have been overlooked in chondrichthyes. here we report the cloning and operational characterization of both the native and the recombinant hepatic type 3 iodothyronine deiodinase in the tropical shark chiloscyllium punctatum. native and recombinant sd3 show ... | 2008 | 18397787 |
| metabolic organization of freshwater, euryhaline, and marine elasmobranchs: implications for the evolution of energy metabolism in sharks and rays. | to test the hypothesis that the preference for ketone bodies rather than lipids as oxidative fuel in elasmobranchs evolved in response to the appearance of urea-based osmoregulation, we measured total non-esterified fatty acids (nefa) in plasma as well as maximal activities of enzymes of intermediary metabolism in tissues from marine and freshwater elasmobranchs, including: the river stingray potamotrygon motoro (<1 mmol l(-1) plasma urea); the marine stingray taeniura lymma, and the marine shar ... | 2006 | 16788033 |
| two new species of yorkeria (tetraphyllidea: onchobothriidae) from chiloscyllium punctatum (elasmobranchii: hemiscylliidae) in thailand. | two new species of the tapeworm genus yorkeria are described from the spiral intestine of a specimen of the brownbanded bambooshark, chiloscyllium punctatum, collected from a fish market in bangsarai, thailand in 1996. the larger of the 2 new tapeworm species, y. hilli, possesses fewer proglottids, fewer testes, and is smaller than most of its congeners. the smaller of the 2 new species, y. kelleyae, conspicuously differs from all of its congeners in its possession of medial hooks that are only ... | 2002 | 12537113 |