plasmodium kentropyxi n.sp. (apicomplexa: haemosporina: plasmodiidae) and a plasmodium tropiduri-like parasite in the lizard kentropyx calcarata (lacertilia: teiidae) in north brazil.plasmodium kentropyxi n.sp. is described in the teiid lizard kentropyx calcarata from north brazil. young asexual stages and gametocytes are at first polar in the erythrocyte but with elongation, move to a lateral position. largest meronts seen contained from 30-40 nuclei and conspicuous greenish-black pigment granules located in a distinct vacuole. with growth the gametocytes eventually assume a smooth, curved cylindrical shape, with evenly rounded ends. pigment is scattered or concentrated aro ...200111474978
fine structure of erythrocytic stages of a plasmodium tropiduri-like malaria parasite found in the lizard kentropyx calcarata (teiidae) from north brazil.the fine structure is described of the merogonic stages and gametocytes of a plasmodium tropiduri aragão et neiva, 1909-like parasite infecting the teiid lizard kentropyx calcarata spix from north brazil. the trophozoites are bordered by two membranes, and with growth a pellicle is formed by the addition of an inner, thick double layer and fragmented membrane. the same type of inner membrane occurs in the pellicle of the merozoites differentiating from the meronts. merozoites contained a large e ...200211993547
intestinal coccidia (apicomplexa: eimeriidae) of brazilian lizards. eimeria carmelinoi n.sp., from kentropyx calcarata and acroeimeria paraensis n.sp. from cnemidophorus lemniscatus lemniscatus (lacertilia: teiidae).eimeria carmelinoi n.sp., is described in the teiid lizard kentropyx calcarata spix, 1825 from north brazil. oocysts subspherical to spherical, averaging 21.25 x 20.15 micro m. oocyst wall smooth, colourless and devoid of striae or micropyle. no polar body or conspicuous oocystic residuum, but frequently a small number of fine granules in brownian movement. sporocysts, averaging 10.1 x 9 microm, are without a stieda body. endogenous stages characteristic of the genus: intra-cytoplasmic, within t ...200212016449
notes on parasitism by amblyomma humerale (acari: ixodidae) in the state of rondônia, western amazon, brazil.the tick amblyomma humerale koch is endemic to south america. all host records refer to the adult stage parasitizing tortoises, mostly yellow-footed tortoise, geochelone denticulata (l.), and red-footed tortoise, geochelone carbonaria (spix). the current study reports the presence of a. humerale in the state of rondônia, brazil. a total of 215 adult ticks (201 males, 14 females) was collected from six g denticulata in an indian reserve and nine geochelone sp. in rural monte negro county, giving ...200212495177
rediscovery and redescription of plasmodium pifanoi and description of two additional plasmodium parasites of venezuelan lizards.plasmodium pifanoi scorza and dagert b., known only from the type host, ameiva ameiva, is redescribed from kentropyx calcarata collected in territorio amazonas, venezuela. schizonts, 6.2 x 4.5 (4-8 x 3-6), produce on average 11.9 (7-16) merozoites. gametocytes average 12.4 x 6.0 (8-16 x 4-10), with length x width (lw) 72.9 (52-112) and l/w 2.18 (1.1-3.3), and always contain 1-5 prominent vacuoles. macrogametocytes in active infection are longer than microgametocytes, with greater lw, but gametoc ...200312760655
differential repetitive dna composition in the centromeric region of chromosomes of amazonian lizard species in the family teiidae.differences in heterochromatin distribution patterns and its composition were observed in amazonian teiid species. studies have shown repetitive dna harbors heterochromatic blocks which are located in centromeric and telomeric regions in ameiva ameiva (linnaeus, 1758), kentropyx calcarata (spix, 1825), kentropyx pelviceps (cope, 1868), and tupinambis teguixin (linnaeus, 1758). in cnemidophorus sp.1, repetitive dna has multiple signals along all chromosomes. the aim of this study was to character ...201627551343
the organization of repetitive dna in the genomes of amazonian lizard species in the family teiidae.repetitive dna is the largest fraction of the eukaryote genome and comprises tandem and dispersed sequences. it presents variations in relation to its composition, number of copies, distribution, dynamics, and genome organization, and participates in the evolutionary diversification of different vertebrate species. repetitive sequences are usually located in the heterochromatin of centromeric and telomeric regions of chromosomes, contributing to chromosomal structures. therefore, the aim of this ...201526867142
cytogenetic analyses of five amazon lizard species of the subfamilies teiinae and tupinambinae and review of karyotyped diversity the family teiidae.lizards of the family teiidae (infraorder scincomorpha) were formerly known as macroteiidae. there are 13 species of such lizards in the amazon, in the genera ameiva (meyer, 1795), cnemidophorus (wagler, 1830), crocodilurus (spix, 1825), dracaena (daudin, 1801), kentropyx (spix, 1825) and tupinambis (daudin, 1802). cytogenetic studies of this group are restricted to karyotype macrostructure. here we give a compilation of cytogenetic data of the family teiidae, including classic and molecular cyt ...201526753079
banding patterns and chromosomal evolution in five species of neotropical teiinae lizards (squamata: teiidae).karyotypes of five species of south american teiid lizards from subfamily teiinae: ameiva ameiva, kentropyx calcarata, k. paulensis, k. vanzoi (2n = 50, all acrocentric), and cnemidophorus ocellifer (2n = 50, all biarmed), are herein described and compared on the basis of conventional and silver staining, and cbg and rbg banding patterns. meiotic data are also included. karyotypes of k. paulensis, k. vanzoi, and c. ocellifer are reported here for the first time. inter-generic variability in ag-n ...200717206461
nematode parasites of teiid lizards from the brazilian amazon rainforest.this study presents the helminth composition and parameters of infection by several species of nematodes in teiid lizards, ameiva a. ameiva (linnaeus, 1758), cnemidophorus cryptus cole & dessauer, 1993, and kentropyx calcarata spix, 1825 from the brazilian amazonian rainforest. the lizard populations we studied were parasitized by six species of nemata, including: spinicauda spinicauda (olfers, 1919), parapharyngodon alvarengai freitas, 1957, physaloptera sp. (adults), physaloptera sp. (larvae), ...201627902893
helminths of the teiid lizard kentropyx calcarata (squamata) from an amazonian site in western brazil.despite being conspicuous members of neotropical lizard communities, aspects of the life history of many teiid lizard species are poorly known, especially endoparasites infecting the genus kentropyx. we studied seven specimens of k. calcarata collected at an amazonian site in mato grosso state, central brazil in 2007. four species of helminth were recovered: oswaldocruzia sp., piratuba digiticauda, physaloptera retusa and physalopteroides venancioi. piratuba digiticauda, a body-cavity, parasite ...200919638259
extinction risks forced by climatic change and intraspecific variation in the thermal physiology of a tropical lizard.temperature increases can impact biodiversity and predicting their effects is one of the main challenges facing global climate-change research. ectotherms are sensitive to temperature change and, although predictions indicate that tropical species are highly vulnerable to global warming, they remain one of the least studied groups with respect to the extent of physiological variation and local extinction risks. we model the extinction risks for a tropical heliothermic teiid lizard (kentropyx cal ...201829549991
molecular and pathological investigations of plasmodium parasites infecting striped forest whiptail lizards (kentropyx calcarata) in brazil.the genus plasmodium (plasmodiidae) ranks among the most widespread intracellular protozoan parasites affecting a wide range of mammals, birds, and reptiles. little information is available about lizard malaria parasites in south america, and the pathological features of the resulting parasitoses remain unknown or poorly understood. to partially fill in these gaps, we conducted blood smear analysis, molecular detection, and phylogenetic and pathological investigations in lizards inhabiting an at ...202032556500
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