| sex chromosomes of the asian black pond turtle, siebenrockiella crassicollis (testudines: emydidae). | a heteromorphism in a pair of macrochromosomes in male siebenrockiella crassicollis is interpreted as an xx/xy sex determining system. the heteromorphism involves a difference in centromere position and amount and distribution of heterochromatin. the only other sex chromosome system known in turtles is found in the kinosternid genus staurotypus and is also an xx/xy system, but it involves a different chromosome pair and different chromosomal rearrangements. these two systems have independently ... | 1981 | 7326996 |
| extensive morphological convergence and rapid radiation in the evolutionary history of the family geoemydidae (old world pond turtles) revealed by sine insertion analysis. | the family geoemydidae is one of three in the superfamily testudinoidea and is the most diversified family of extant turtle species. the phylogenetic relationships in this family and among related families have been vigorously investigated from both morphological and molecular viewpoints. the evolutionary history of geoemydidae, however, remains controversial. therefore, to elucidate the phylogenetic relationships of geoemydidae and related species, we applied the sine insertion method to invest ... | 2006 | 17345673 |
| the origin and differentiation process of x and y chromosomes of the black marsh turtle (siebenrockiella crassicollis, geoemydidae, testudines). | the black marsh turtle (siebenrockiella crassicollis) has morphologically differentiated x and y sex chromosomes. to elucidate the origin and evolutionary process of s. crassicollis x and y chromosomes, we performed cross-species chromosome painting with chromosome-specific dna from chinese soft-shelled turtle (pelodiscus sinensis) and chromosome mapping of the sex-linked genes of s. crassicollis using fish. the x and y chromosomes of s. crassicollis were hybridized with dna probe of p. sinensis ... | 2011 | 22183803 |
| a new species of opisthioglyphe (trematoda: telorchiidae) from gall bladder of turtles in malaysia. | opisthioglyphe sharmai n. sp. is described from the gall bladder of the malayan box turtle, cuora amboinensis, and the black marsh turtle, siebenrockiella crassicollis, in malaysia. the new species is morphologically similar to opisthioglyphe ranae and some other members of the genus parasitic in amphibians and reptiles. opisthioglyphe sharmai n. sp. is easily differentiated from all other members of the genus by the cirrus sac extending posterior to the ventral sucker, while in all previously k ... | 2012 | 22263805 |
| discovery of the youngest sex chromosomes reveals first case of convergent co-option of ancestral autosomes in turtles. | most turtle species possess temperature-dependent sex determination (tsd), but genotypic sex determination (gsd) has evolved multiple times independently from the tsd ancestral condition. gsd in animals typically involves sex chromosomes, yet the sex chromosome system of only 9 out of 18 known gsd turtles has been characterized. here, we combine comparative genome hybridization (cgh) and bac clone fluorescent in situ hybridization (bac fish) to identify a macro-chromosome xx/xy system in the gsd ... | 2017 | 26842819 |
| new genus of blood fluke (digenea: schistosomatoidea) from malaysian freshwater turtles (geoemydidae) and its phylogenetic position within schistosomatoidea. | : baracktrema obamai n. gen., n. sp. infects the lung of geoemydid turtles (black marsh turtle, siebenrockiella crassicollis [type host] and southeast asian box turtle, cuora amboinensis ) in the malaysian states of perak, perlis, and selangor. baracktrema and unicaecum stunkard, 1925 are the only accepted turtle blood fluke genera having the combination of a single cecum, single testis, oviducal seminal receptacle, and uterine pouch. baracktrema differs from unicaecum by having a thread-like b ... | 2016 | 27042972 |
| ultrastructural characteristics of black marsh turtle spermatozoa obtained by electroejaculation. | the black marsh turtle (geoemydidae: siebenrockiella crassicollis) is a freshwater turtle that occurs in equatorial tropical climates in south east asia. the semen of s. crassicollis was investigated by electroejaculation. the spermatozoa of s. crassicollis are filiform in shape with curved heads. the entire length, midpiece to tail length, tail width and tail length of the spermatozoa were 71.33 ± 1.55 μm, 49.92 ± 1.13 μm, 0.43 ± 0.02 μm and 48.53 ± 0.25 μm, respectively. the head length, head ... | 2020 | 32686185 |