PBDB Taxon

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Acheloma

Osteichthyes - Temnospondyli - Trematopidae

Taxonomy

Acheloma was named by Cope (1882). Its type is Acheloma cumminsi. It is the type genus of Achelomidae. It was considered monophyletic by Polley and Reisz (2011).

It was assigned to Eryopidae by Cope (1882), Cope (1884), Hay (1902), Broili (1913); to Achelomidae by Watson (1919); to Trematopsidae by Dilkes and Reisz (1987), Carroll (1988); to Temnospondyli by Maddin et al. (2012); and to Trematopidae by Anderson et al. (2008), Polley and Reisz (2011), Schoch (2013), Osterling Arias et al. (2024).

Species

A. cryptatheria, A. cumminsi (syn. A. dunni, Trematops milleri) (type species)

Entered

by E. Fara on 2003-01-23; modified by M. Carrano on 2014-11-12

Synonyms

Trematops was named by Williston (1909). It is not extant. It is the type genus of Trematopsidae.

It was synonymized objectively with Acheloma by Dilkes and Reisz (1987), Anderson et al. (2008).

It was assigned to Trematopsidae by Williston (1910), Watson (1919), Carroll (1988).

Synonymy list

Year	Name and author
1882	Acheloma Cope pp. 455-456
1884	Acheloma Cope p. 33
1902	Acheloma Hay p. 423
1909	Trematops Williston
1910	Trematops Williston p. 278
1913	Acheloma Broili p. 98
1919	Acheloma Watson p. 65
1919	Trematops Watson p. 65
1987	Acheloma Dilkes and Reisz p. 10
1988	Acheloma Carroll
1988	Trematops Carroll
2008	Acheloma Anderson et al. p. 72
2011	Acheloma Polley and Reisz p. 792
2012	Acheloma Maddin et al.
2013	Acheloma Schoch
2024	Acheloma Osterling Arias et al.

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
class	Osteichthyes
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()

Rank	Name	Author
—	Tetrapoda
class	Amphibia
order	Temnospondyli	()
—	Eutemnospondyli
—	Rhachitomi	()
—	Dissorophoidea	()
—	Xerodromes
—	Olsoniformes
family	Trematopidae	()
genus	Acheloma

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.

G. †Acheloma Cope 1882

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†Acheloma cryptatheria Osterling Arias et al. 2024

†Acheloma cumminsi Cope 1882

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Invalid names: Acheloma dunni Polley and Reisz 2011 [synonym], Trematops milleri Williston 1909 [synonym]

Invalid names: Trematops Williston 1909 [objective synonym]

Diagnosis

Reference	Diagnosis
B. P. Polley and R. R. Reisz 2011	Large trematopid temnospondyl characterized by the following autapomorphies: toothed, raised crest running anteroposteriorly along the vomer, mesial to the choana; otic notch with a nearly horizontal ventral margin.