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Amia efremovi

Osteichthyes - Amiiformes - Amiidae

Taxonomy
Amia efremovi was named by Sytchevskaya (1981). Its type specimen is PIN 3874/1a, a skeleton, and it is a compression fossil. Its type locality is Ulan Bulak [PMPE 1963], which is in a Maastrichtian terrestrial horizon in the Nemegt Formation of Mongolia.

It was recombined as Cyclurus efremovi by Sytchevskaya (1981), Grande and Bemis (1998).

Sister species lacking formal opinion data
A. barroisi, A. uintensis, A. barroisi
Entered
by D. Sinopoli (authorized by M. Uhen) on 2026-05-19; modified by D. Sinopoli on 2026-05-19

Synonymy list
YearName and author
1981Amia efremovi Sytchevskaya
1981Cyclurus efremovi Sytchevskaya
1998Cyclurus efremovi Grande and Bemis

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
RankNameAuthor
subclassActinopterygii()
—NeopterygiiRegan 1923
infraclassHolostei(Müller 1846)
orderAmiiformesHay 1929
suborderAmioidei
familyAmiidae
genusAmia
speciesefremovi

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.

†Amia efremovi Sytchevskaya 1981
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Diagnosis
ReferenceDiagnosis
L. Grande and W. E. Bemis 1998Cyclurus efremovi differs from all other known species of Cyclurus by the following adult characters A through D. (A) Dermal bones of the skull exhibit an extremely weak ornamentation pattern (versus stronger ornamentation in other amiine species as far as known). (B) The lower postinfraorbital is relatively shallow (versus a larger depth-to-length ratio of lower postinfraorbital in other species of Cyclurus). (C) The interparietal suture is extremely irregular resulting in highly asymmetrical parietals (versus interparietal suture nearly straight along sagittal plane in other species of Cyclurus except for C fragosus). (D) The supramaxilla is small and weakly developed.