Trionyx foveatus Leidy 1856 (softshell turtle)

Reptilia - Testudines - Trionychidae

Alternative combinations: Aspideretes foveatus, Hummelichelys foveatus

Synonyms: Aspideretes maturus Lambe 1914, Aspideretes rugosus Parks 1933, Aspideretes subquadratus Lambe 1914, Hummelichelys subquadratus Lambe 1914

Full reference: J. Leidy. 1856. Notices of remains of extinct reptiles and fishes, discovered by Dr. F. V. Hayden in the bad lands of the Judith River, Nebraska Territory. Proceedings of the Academy of Natural Sciences of Philadelphia 8:72-73

Belongs to Trionyx according to N. S. Vitek and W. G. Joyce 2015

See also Chkhikvadze 2000, Danilov and Vitek 2013, Gardner et al. 1995, Hay 1902, Hay 1908, Joyce et al. 2016, Lambe 1902, Lambe 1914, Lambe 1916, Leidy 1856, Leidy 1857, Leidy 1860 and Parks 1933

Sister taxa: Trionyx admirabilis, Trionyx aequa, Trionyx allani, Trionyx austerus, Trionyx baynshirensis, Trionyx beecheri, Trionyx boulengeri, Trionyx capellinii, Trionyx dissolutus, Trionyx ellipticus, Trionyx eloisae, Trionyx gangeticus, Trionyx gilbentuensis, Trionyx gobiensis, Trionyx gregarius, Trionyx henrici, Trionyx ikoviensis, Trionyx impressus, Trionyx jixiensis, Trionyx johnsoni, Trionyx kansaiensis, Trionyx latus, Trionyx leucopotamicus, Trionyx linchuensis, Trionyx messelianus, Trionyx miensis, Trionyx minusculus, Trionyx miocaenus, Trionyx mira, Trionyx ninae, Trionyx onomatoplokos, Trionyx phayrei, Trionyx pliocenicus, Trionyx reesidei, Trionyx riabinini, Trionyx robustus, Trionyx shiluutulensis, Trionyx silvestris, Trionyx singularis, Trionyx triunguis, Trionyx uintaensis, Trionyx vegetus, Trionyx vindobonensis

Type specimens:

  • Trionyx foveatus: ANSP 9269, a partial shell (small fragments of costal and sternal plates). Its type locality is Judith River badlands (USGS), which is in a Campanian/Campanian terrestrial horizon in the Judith River Formation of Montana.
  • Aspideretes maturus: NMC 1065, a carapace. Its type locality is below mouth of Berry Creek (NMC), which is in a Campanian terrestrial horizon in Canada.
  • Aspideretes rugosus: ROM 775, a carapace. Its type locality is Sand Creek (125 ft level) [ROM], which is in a Campanian terrestrial horizon in the Belly River Formation of Canada.
  • Aspideretes subquadratus: NMC 345, a carapace. Its type locality is below mouth of Berry Creek (NMC), which is in a Campanian terrestrial horizon in Canada.

Ecology: aquatic piscivore-carnivore


• Cretaceous of United States (2: Montana, North Dakota collections)

Total: 2 collections each including a single occurrence

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Specimen images are retrieved through the ePANDDA API.

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