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Reptilia - Testudines - Trionychidae

T. admirabilis, T. aequa (syn. Amyda crassa), T. allani, T. austerus (syn. Aspideretes vorax, Aspideretes fontanus), T. baynshirensis, T. beecheri, T. boulengeri (syn. T. clavatomarginatus), T. capellinii (syn. T. affinis, T. capellinii montevialensis, T. intermedius, T. insolitus, T. gemmellaroi, T. schaurothianus, T. capellinii conjugens, T. capellinii perexpansa, T. capellinii gracilina), T. dissolutus, T. ellipticus (syn. Aspideretes grangeri, Aspideretes annae), T. eloisae, T. foveatus (syn. Aspideretes subquadratus, Aspideretes maturus, Aspideretes rugosus), T. gangeticus, T. gilbentuensis, T. gobiensis, T. gregarius (syn. Rafetus gilmorei), T. henrici (syn. T. planus, T. marginatus, T. rivosus, T. barbarae, T. circumsulcatus, T. incrassatus), T. ikoviensis, T. impressus, T. jixiensis, T. johnsoni (syn. Amyda neimenguensis), T. kansaiensis, T. latus, T. leucopotamicus, T. linchuensis, T. messelianus (syn. Rafetoides austriacus, T. messelianus lepsiusi, T. messelianus kochi), T. miensis, T. minusculus, T. miocaenus, T. mira (syn. Platypeltis postera, Platypeltis extensa), T. ninae (syn. T. zaisanensis, T. turgaicus), T. onomatoplokos, T. phayrei, T. pliocenicus, T. reesidei (syn. Aspideretes quadratus), T. riabinini, T. robustus (syn. Aspideretes ovatus), T. shiluutulensis, T. silvestris (syn. T. michauxi), T. singularis (syn. Aspideretes puercensis, Aspideretes sagatus), T. triunguis, T. uintaensis (syn. Amyda franciscae, Amyda nelsoni, Aspidonectes tritor), T. vegetus, T. vindobonensis (syn. T. rostratus, T. hoernesi, T. septemcostatus, T. teiritzbergensis, T. peneckei, T. gergensi, T. petersi, T. teyleri, T. brunhuberi)
Species lacking formal opinion data

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Synonymy list
YearName and author
1809Trionyx Geoffroy Saint-Hilaire
1842Trionyx Owen p. 168
1860Trionyx Leidy p. 148
1865Trionyx Leidy p. 113
1889Trionyx Lydekker p. 7
1891Trionyx Cope p. 5
1902Trionyx Hay p. 453
1904Trionyx Case p. 60
1908Trionyx Lambe
1931Trionyx Gilmore p. 253
1964Trionyx Estes and Tihen p. 465
1967Trionyx Miller p. 226
1967Trionyx Wilson p. 205
1970Trionyx Estes and Berberian p. 5
1971Trionyx Khosatzky and Mlynarski p. 141
1981Trionyx Holman and Sullivan p. 141
1988Trionyx Carroll
1989Trionyx Bryant p. 40
1990Trionyx Holman et al. p. 524
1996Trionyx Frank and Ramus
1999Francedebroinella Chkhikvadze
2000Sinamyda Chkhikvadze
2000Trionyx Sukhanov p. 346
2000Trionyx Weisrock and Janzen p. 153
2002Trionyx Holman
2007Trionyx Karl p. 34
2007Trionyx Staesche et al.
2008Trionyx Böhme p. 168
2010Trionyx Vitek and Danilov
2011Trionyx Danilov et al. p. 400
2012Trionyx Vitek and Danilov p. 52
2013Trionyx Danilov and Vitek
2013Trionyx Pérez-García et al.
2014Trionyx Vitek and Danilov
2014Trionyx van Dijk et al.
2017Trionyx Georgalis and Joyce

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phylumChordataHaeckel 1847
subclassDipnotetrapodomorpha(Nelson 2006)
Testudinata(Oppel 1811)
orderTestudinesBatsch 1788
familyTrionychidaeGray 1825
Trionychinae(Gray 1825)

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

V. M. Chkhikvadze 2000 (Sinamyda)The only representative of the family Trionychidae with elongated disk of carapace (width is 60% length). Bony callosities completely cover distal ends of ribs. All dorsal surface of the carapace is ornamented (sculptured). Nuchal has a shape of circle segment. Preneural present. The length of the free margin of the first costal exceeds the length of the free margin of the second costal. This character is extremely rarely occurred in trionychids. 7 pairs of costals are well preserved. However, it could be supposed, that these turtles have also VIII pair of reduced costals. The most wedge-shaped are III and VI. The preserved anterior five neurals are hexagonal with short sides posteriorly. They are big and relatively elongated in comparison to other trionychids. The length of the second neural, for instance, is only 6-7 times shorter than the carapace length. The V neural, most probably, is tetragonal. More caudal neurals are not preserved in this specimen, however, the presence of 8 or at least 7 neurals could be supposed.