| dating cryptodiran nodes: origin and diversification of the turtle superfamily testudinoidea. | the superfamily testudinoidea is the most diverse and widely distributed clade of extant turtles. surprisingly, despite an extensive fossil record, and increasing amount of molecular data available, the temporal origin of this group is still largely unknown. to address this issue, we used a comprehensive molecular dataset to perform phylogenetic and molecular dating analyses, as well as seven fossil constraints to calibrate the ages of the nodes in the phylogeny. the molecular dataset includes t ... | 2012 | 22100825 |
| tracking platyhelminth parasite diversity from freshwater turtles in french guiana: first report of neopolystoma price, 1939 (monogenea: polystomatidae) with the description of three new species. | polystomatid flatworms in chelonians are divided into three genera, i.e. polystomoides ward, 1917, polystomoidella price, 1939 and neopolystoma price, 1939, according to the number of haptoral hooks. among the about 55 polystome species that are known to date from the 327 modern living chelonians, only four species of polystomoides are currently recognised within the 45 south american freshwater turtles. | 2017 | 28143592 |
| description of electrophoretic and chromatographic hemoglobin profile of rhinoclemmys punctularia. | studies of the hemoglobin pattern in brazilian reptiles are important for determining ecological and phylogenetic relationships, but they are scarce. peripheral blood samples were obtained from 7 males and 18 females of rhinoclemmys punctularia. the hematological profile was based on the total hemoglobin and hematocrit values. the hemoglobin profile was obtained using electrophoretic procedures at different ph, isoelectric focusing, globin chain electrophoresis, and hplc. the hematocrit (31 +/- ... | 2007 | 17952865 |
| habitat use, size structure and sex ratio of the spot-legged turtle, rhinoclemmys punctularia punctularia (testudines: geoemydidae), in algodoal-maiandeua island, pará, brazil. | rhinoclemmys punctularia punctularia is a semi-aquatic chelonian found in northern south america. we analyzed the habitat use, size structure and sex ratio of the species on algodoal-maiandeua island, a protected area on the northeastern coast of the brazilian state of pará. four distinct habitats (coastal plain lake, flooded forest "igapó", interdunal lakes, and tidal channels) were surveyed during the rainy (march and april) and dry (august and september) seasons of 2009, using hoop traps. for ... | 2012 | 22458235 |
| molecular cytogenetics characterization of rhinoclemmys punctularia (testudines, geoemydidae) and description of a gypsy-h3 association in its genome. | the wide variation found in the size of eukaryotic genomes is largely related to the accumulation of repetitive sequences. studies show that these sequences can go through an evolutionary process (molecular co-optation) and acquire new genomic functions. cytogenetic studies reveal a wide karyotypic variation between chelonians (order testudines) (2n = 26-68), attributed mainly to the number of microchromosomes. the study of repetitive dnas has the potential to provide data on the dynamics of the ... | 2020 | 32061764 |
| serpinema cayennensis n. sp. (nematoda: camallanidae), a parasite of the freshwater turtle rhinoclemmys punctularia daudin (reptilia: testudines: geoemydidae) from french guiana: morphology and phylogenetic relationships with other turtle-parasitising camallanids. | the genus serpinema was erected from the genus camallanus to include species parasitising freshwater turtles. following this, the taxonomic status of serpinema was challenged by different authors considering it as a subgenus or junior synonym of camallanus. several specimens of these nematodes were retrieved from the spot-legged wood turtle rhinoclemmys punctularia from cayenne, french guiana. these specimens clearly differed from previously reported serpinema and camallanus species parasitising ... | 2019 | 31715977 |