| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Taxonomy
Muriwaimanu was named by Mayr et al. (2017).
It was assigned to Sphenisciformes by Mayr et al. (2017) and Mayr et al. (2020).
It was assigned to Sphenisciformes by Mayr et al. (2017) and Mayr et al. (2020).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Muriwaimanu Mayr et al. |
| 2020 | Muriwaimanu Mayr et al. p. 3 |
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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 | Distinguished from Waimanu Jones, Ando, and Fordyce, 2006: in Slack et al. (2006) in having shaft of tarsometatarsus proportionally wider (ratio of minimum shaft width to length of bone being 0.22 in W. manneringi and 0.26 in M. tuatahi), trochlea metatarsi II less plantarly deflected, and plantar articular surface of trochlea metatarsi III with straight rather than tapering proximal end (Fig. 2). Humerus with shaft proportionally narrower than in all other sphenisciforms for which this bone is known (ratio of minimum shaft width to maxi- mum length: 0.12); crista bicipitalis of humerus forming a pro- nounced, distally directed convexity; and proximal portion of radius gently curved in craniocaudal direction rather than sharply deflected. Muriwaimanu, n. gen., is distinguished from the late Paleocene Crossvallia unienwillia Tambussi et al., 2005, in that the humerus lacks a deep fossa at the impressio musculi pectora- lis, and femur more gracile and with fovea ligamenti capitis situ- ated on the proximal surface of the caput femoris (medially placed in Crossvallia; Jadwiszczak et al., 2013). Muriwaimanu, n. gen., differs from the early Eocene Kaiika maxwelli Fordyce and Thomas, 2011, in humerus lacking a deep fossa at impressio mus- culi pectoralis, tuberculum ventrale without a fossa on its ventral surface, and distal end without a sharply defined supracondylar tubercle (tuberculum supracondylare dorsale). The new taxon is distinguished from all other fossil and extant Sphenisciformes in the following features: coracoid shorter than humerus; humerus with distinctly raised crista musculi supracoracoidei and a curved shaft; sulcus scapulotricipitalis situated on the caudal surface of the humerus; ulna and radius much narrower; distal end of 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: Benton 1983, Marsh 1875, Bush and Bambach 2015 | |||||
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Selandian - Thanetian | New Zealand | Waimanu tuatahi (85839 85840 85841) | |
| Selandian - Thanetian | New Zealand (South Island) | M. tuatahi (175680) |