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Geikiidae
Taxonomy
Geikiidae was named by Nopcsa (1923). It is not extant.
It was reranked as the unranked clade Geikiidae by Kammerer and Angielczyk (2009).
It was assigned to Anomodontia by Nopcsa (1923); to Pristerodontia by Maisch and Gebauer (2005); and to Cryptodontia by Kammerer and Angielczyk (2009).
It was reranked as the unranked clade Geikiidae by Kammerer and Angielczyk (2009).
It was assigned to Anomodontia by Nopcsa (1923); to Pristerodontia by Maisch and Gebauer (2005); and to Cryptodontia by Kammerer and Angielczyk (2009).
Synonymy list
| Year | Name and author |
|---|---|
| 1923 | Geikiidae Nopcsa |
| 2005 | Geikiidae Maisch and Gebauer |
| 2009 | Geikiidae Kammerer and Angielczyk |
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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.
Unr. †Geikiidae Nopcsa 1923
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Unr. †Geikiinae Nopcsa 1923
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G. †Aulacephalodon Seeley 1898
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†Aulacephalodon bainii Owen 1845
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Invalid names: Aulacocephalodon cadlei Broom 1948 [synonym], Aulacocephalodon hartzenbergi Broom 1937 [synonym], Aulacocephalodon haughtoni Broom 1921 [synonym], Aulacocephalodon latissimus Broom 1932 [synonym], Aulacocephalodon luckhoffi Broom 1937 [synonym], Aulacocephalodon peavoti Broom 1921 [synonym], Aulacocephalodon pricei Broom and George 1950 [synonym], Aulacocephalodon tigriceps Owen 1855 [synonym], Aulacocephalodon vanderhorsti Broom and George 1950 [synonym], Dicynodon bolorhinoides Watson 1960 [synonym], Dicynodon laticeps Broom 1912 [synonym], Proaulacocephalodon miltoni Toerien 1955 [synonym]
†Aulacephalodon cadlei Broom 1948
†Aulacephalodon rubidgei Broom 1940
Invalid names: Proaulacocephalodon Toerien 1955 [synonym]
G. †Odontocyclops Keyser and Cruickshank 1979
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Invalid names: Aulacocephalodontinae Toerien 1953 [empty]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. F. Kammerer and K. D. Angielczyk 2009 | No unambiguous autapomorphies diagnose Geikiidae in the analysis of Angielczyk (2007), although the gap coded morphometric character “maximum width of the distal end of the radius relative to the maximum length of the radius” provides support for the monophyly of this clade. Taxon sampling in the analyses of Fröbisch (2007) and Fröbisch & Reisz (2008) differs from that of Angielczyk (2007) by their exclusion of Odontocyclops. Taking this difference into account, the data sets of Fröbisch (2007) and Fröbisch & Reisz (2008) identified two autapomorphies of Geikiidae: (1) posterior portion of zygomatic portion of the squamosal thickened and/or downturned; (2) labial fossa present. However, both of these characters are absent in Odontocyclops (Angielczyk 2002, 2007). |