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Diomedavus knapptonensis
Taxonomy
Diomedavus knapptonensis was named by Mayr and Goedert (2017). Its type specimen is LACM 130330, a partial skeleton (proximal half of left humer- us, proximal portion of right carpometacarpus, fragmen- tary extremitas sternalis of right coracoid, left tarsometatarsus, and cerv), and it is a 3D body fossil. Its type locality is LACM 4510, which is in a Chattian marine horizon in the Lincoln Creek Formation of Washington. It is the type species of Diomedavus.
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Diomedavus knapptonensis Mayr and Goedert p. 661 figs. Fig. 1 |
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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.
†Diomedavus knapptonensis Mayr and Goedert 2017
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Mayr and J. L. Goedert 2017 | Small albatross that was distinct- ly smaller than all extant albatross species (tarsometatarsus length 64.0 mm versus 80–122 mm in the extant species; Davis 2003: table 2 and own data for Phoebetria fusca). Differs from the species of the taxa Tydea and Plotornis in the features listed in the differential diagnosis of Diomeda- vus, n. gen. Distinguished from ‘‘Diomedea’’ tanakai Davis, 2003 in the partially ossified retinaculum extensorium tarsometatarsi. Differs from ‘‘Diomedea’’ californica Miller, 1962 in the much smaller size (with a distal tarsometatarsus width of 20.6 mm, ‘‘D.’’ californica is larger than Th. melanophris, in which the distal tarsometatarsus measures 17.8 6 0.7 mm [Davis 2003]). Comparisons with the holotype of ‘‘Diomedea’’ milleri Howard, 1966, which is a proximal ulna, are not possible. This species may have been of similar size to Diomedavus knapptonensis, n. gen. et sp., but because the new late Oligocene species is at least 8 million years older than the middle Miocene ‘‘D.’’ milleri, we consider a species-level identity unlikely. A tarsometatarsus that was tentatively referred to ‘‘D.’’ milleri by Howard (1966) differs from D. knapptonensis, n. gen. et sp. in that the crista medialis (fdl) of the hypotarsus is proportionally shorter and the lateral foramen vasculare proximale is smaller in plantar view (H. Thomas, personal communication to JLG in 1990). |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Marsh 1875, Bush and Bambach 2015, Benton 1983 | |||||