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Sequiwaimanu
Taxonomy
Sequiwaimanu was named by Mayr et al. (2017). Its type is Sequiwaimanu rosieae.
It was assigned to Sphenisciformes by Mayr et al. (2017).
It was assigned to Sphenisciformes by Mayr et al. (2017).
Species
S. rosieae (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Sequiwaimanu Mayr et al. |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Mayr et al. 2017 | Characterized by skull with craniocau- dally wide processus postorbitalis; cranial portion of carina sterni markedly cranially projected and forming a dorsoventrally nar- row blade; apex carinae with concave articulation facet for extremitas sternalis of furcula; ulna with two rows of quill pits; dorsal surface of proximal end of ulna with narrow furrow next to caudal margin; and femur with marked protuberance on caudal surface, at the beginning of the distal third of the bone. Differs from Muriwaimanu, n. gen., in the dorsoventrally wider extremi- tas sternalis of furcula forming two distinct projections; scapula with shaft widening caudal of collum scapulae (Fig. 3D, E); cora- coid with processus procoracoideus more ventrally deflected (Fig. 3A–C); humerus, ratio of minimum shaft width to length of bone: 0.15 (0.12 in Muriwaimanu, n. gen.; Fig. 4A–C); and carpo- metacarpus with proportionally longer os metacarpale alulare, which reaches distinctly farther distally than the proximal end of the spatium intermetacarpale (Fig. 4F, G). Differs from Waimanu in the mediolaterally wider central portion of synsacrum; lateral surface of proximal end of tibiotarsus with a distinct tubercle dis- tal of facies articularis lateralis and next to fossa flexoria; tuberosi- tas poplitea (on proximal end of tibiotarsus) less developed; condylus lateralis of tibiotarsus forming a distinct bulge on the caudal portion of the lateral surface; distal portion of sulcus exten- sorius mediolaterally wider just above pons supratendineus; and distal opening of canalis extensorius of ovoid rather than circular shape. Distinguished from the much larger late Paleocene Cross- vallia in more gracile femur, with the fovea ligamenti capitis situ- ated on the proximal surface of the caput femoris (medially placed in Crossvallia; Jadwiszczak et al., 2013). Sequiwaimanu, n. gen., differs from the early Eocene Kaiika in the humerus lacking a marked fossa on the ventral surface of the proximal end; crista bicipitalis not forming a pronounced, distally directed convexity; proximal end of humerus without notch between the proximal ter- minus of the crista deltopectoralis and the caput humeri; and dis- tal end of humerus without sharply defined tuberculum supracondylare dorsale. The new taxon is distinguished from all other fossil and extant sphenisciforms in the coracoid not exceed- ing the humerus in length; humerus with distinctly raised crista musculi supracoracoidei and a curved shaft; sulcus scapulotricipi- talis situated on the caudal (rather than ventral) surface of the humerus; ulna and radius much narrower; distal end of the ulna with well-defined tuberculum carpale, condylus dorsalis, and con- dylus ventralis; carpometacarpus with well-developed processus pisiformis; and distal end of tibiotarsus with medially positioned sulcus extensorius. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Marsh 1875, Benton 1983, Bush and Bambach 2015 | |||||
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Selandian - Thanetian | New Zealand (South Island) | S. rosieae (161199) |