Euhelopodidae

Euhelopodids Temporal range: Early Cretaceous–Late Cretaceous, Aptian–Maastrichtian PreꞒ Ꞓ O S D C P T J K Pg N
Life restoration of a Euhelopus zdanskyi
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	Saurischia
Clade:	†Sauropodomorpha
Clade:	†Sauropoda
Clade:	†Macronaria
Clade:	†Somphospondyli
Family:	†Euhelopodidae Romer, 1956
Type species
† Euhelopus zdanskyi Wiman, 1929
Genera
†Chiayusaurus? †Daxiatitan? †Erketu †Euhelopus †Gannansaurus? †Gobititan? †Huabeisaurus? †Jiangshanosaurus †Phuwiangosaurus †Qiaowanlong †Ruixinia? †Silutitan †Tambatitanis? †Tangvayosaurus †Yongjinglong †Yunmenglong †Mamenchisauridae?
Synonyms
Helopodidae Wiman, 1929

Euhelopodidae is a

The taxonomic content of Euhelopodidae is uncertain, as a result of the unstable position of Euhelopus itself.[3] Some studies have concluded that Euhelopus is a non-neosauropod closely related to Mamenchisaurus, which would make Euhelopodidae equivalent to Mamenchisauridae. Other studies have interpreted Euhelopus as neosauropod united with titanosaurs in Somphospondyli. A joint study by Jeffrey Wilson and Paul Upchurch, who had previously taken opposite sides in the debate, concluded that Euhelopus was closely related to titanosaurs.^[4] However, the lack of research on Mamenchisaurus-like taxa has hindered proper testing of this hypothesis, and there are several similarities between Euhelopus and Mamenchisaurus-like taxa that have not been taken into account in most analyses.^[5]

Michael D'Emic (2012) formulated the first phylogenetic definition of Euhelopodidae, defining it as the clade containing "neosauropods more closely related to Euhelopus zdanskyi than to Neuquensaurus australis". Below is a cladogram presenting the cladistic hypothesis of Euhelopodidae proposed by D'Emic.

In their 2021