†unranked clade Helochelydridae Nopcsa 1928

Reptilia - Testudinata - Helochelydridae

Alternative spelling: Helochelydrinae

Synonym: Solemydidae Lapparent and Murelaga 1997 [objective synonym]

Full reference: B. F. Nopcsa. 1928. Palaeontological notes on reptiles. V. On the skull of the Upper Cretaceous dinosaur Euoplocephalus. Geologica Hungarica, Series Palaeontologica 1(1):1-54

Parent taxon: Perichelydia according to W. G. Joyce 2017

See also Joyce et al. 2014, Milner 2004, Nopcsa 1928, Pereda-Suberbiola et al. 2000 and Pérez-García et al. 2012

Sister taxa: Meiolaniformes, Sichuanchelyidae, Spoochelys

Subtaxa: Helochelydra Helochelys Naomichelys Plastremys Solemys

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Distribution:

• Cretaceous of Canada (3: Alberta, British Columbia collections), France (16), Germany (1), Mexico (2), Spain (17), the United Kingdom (7), United States (32: Arkansas, Maryland, Missouri, Montana, Nevada, Oklahoma, Texas, Utah, Wyoming)

Total: 78 collections including 80 occurrences

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