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Onchocephalus mexicanus
Taxonomy
Onchocephalus mexicanus was named by Lochman (1952). Its type specimen is U.S.N.M. No.115713, a cephalon/head (cranidium), and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1952 | Onchocephalus mexicanus Lochman pp. 105-107 figs. 6-17 |
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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.
†Onchocephalus mexicanus Lochman 1952
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. Lochman 1952 | Onchocephalus mexicanus Lochman as here recognized differs from O. buelnaensis in the steeper descent of the brim and continued down-slope of the border of the cranidium, and the steep slope of the pleural platforms of the pygidium. The species are definitely close, but the cranidia from each locality can be separated into the two types. The author was not able to demonstrate a gradational series between the two types, but if a hundred or more specimens are cleaned, it may be possible to show such a feature. This would afford a very interesting problem as plenty of material is available. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Whittington et al. 1997, Aberhan et al. 2004 | |||||