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Alca stewarti
Taxonomy
Alca stewarti was named by Martin et al. (2000). Its type specimen is BMNH A 7050, a limb element (left ulna), and it is a 3D body fossil. Its type locality is Kallo, Kattendijk Fm., which is in a Zanclean offshore shelf claystone in the Kattendijk Formation of Belgium.
Synonymy list
| Year | Name and author |
|---|---|
| 2000 | Alca stewarti Martin et al. p. 54 figs. Figs. 1, 2 |
| 2005 | Alca stewarti Dyke and Walker p. 236 |
| 2009 | Alca stewarti Wijnker and Olson p. 482 |
| 2011 | Alca stewarti Smith and Clarke p. 22 |
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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.
†Alca stewarti Martin et al. 2000
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| N. A. Smith and J. A. Clarke 2011 | Although missing data for other Alca species (e.g., A. ausonia) prevents the unambiguous optimization of all the characters listed below, examination of the holotype, paratype, and additional referred material (USNM 242238, USNM 446650) identified the following unique suite of characteristics in which A. stewarti differs from other species of Alca: notch in medial sternal process of coracoid absent (51:0) as in A. olsoni; sternocoracoidal facet of coracoid angled ~135° (52:1) as in A. carolinensis; dorsal humeral shaft between deltopectoral crest and dorsal tubercle slightly concave (57:0); capital incisure of humerus broader, and expanded farther ventrally; ventral tubercle of humerus more ventrally deflected than other Alca (76:1). Contra Martin et al. (2001), the tricipital sulci of the distal humerus are approximately equal in width, as in other Alca. Alca stewarti is larger (e.g., greatest length of humerus longer; Table 4 and Fig. 2) than all other known Alca heretofore described. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Bush and Bambach 2015, Marsh 1875, Benton 1983 | |||||