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Bucephala ossivallis
Taxonomy
Bucephala ossivallis was named by Brodkorb (1955). Its type specimen is Brodkorb 172, a limb element (coracoid), and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
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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.
†Bucephala ossivallis Brodkorb 1955
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. Brodkorb 1955 | Referable to the Subfamily Aythyinae on the basis of the head of the coracoid rising forward and upward from the anterior plane of the shaft.
Closely agrees with the living Bucephala clangula (Linnaeus) in general appearance, particularly in the shape of the brachial tuber- osity and the truncated upper margin of the head. Differs from B. clangulain much smaller size; more curved coraco-humeral groove; better developed procoracoid process; and more excavated triosseal canal. Differs from living Bucephala albeola (Linnaeus) in larger size; less pronounced medial overhang of brachial tuberosity; relatively shallower head, which is more inclined from plane of shaft; stouter shaft; more curved coraco-humeral groove; better developed procora- coid process; more excavated triosseal canal. Also resembles Melanittain truncate head and decidedly curved coraco-humeral groove. Differs in much smaller size and in lacking the massiveness of the bone of that genus; more excavated triosseal canal; less overhanging medial end of lip of brachial tuberosity. Differs more widely from Aythya, although resembling the smaller forms of that genus in size. Aythya has the head more rounded and less inclined forward from the plane of the shaft; less curved coraco- humeral groove; and shallower triosseal canal. |
Measurements
No measurements are available
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| Source: subf = subfamily, o = order | |||||
| References: Marsh 1875, Sedinger 1997 | |||||