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Shirerpeton isajii
Taxonomy
Shirerpeton isajii was named by Matsumoto and Evans (2018). Its type specimen is SBEI 2459, a partial skeleton, and it is a compression fossil. Its type locality is Kaseki-kabe (facies III), Shiramine, which is in a Barremian mire/swamp mudstone/sandstone in the Kuwajima Formation of Japan. It is the type species of Shirerpeton.
Synonymy list
| Year | Name and author |
|---|---|
| 2018 | Shirerpeton isajii Matsumoto and Evans p. 6 |
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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.
†Shirerpeton isajii Matsumoto and Evans 2018
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. Matsumoto and S. E. Evans 2018 | A genus of albanerpetontid that resembles Albanerpeton spp. and Wesserpeton evansae, and differs from Anoualerpeton spp. and Celtedens ibericus, in having a frontal that is triangular rather than bell-shaped; differs from all but Albanerpeton arthridion, in that the frontal body is short but anteriorly quite wide, but differs from A. arthridion in having a longer, more pointed internasal process; resembles Wesserpeton and A. arthridion in its very small body size, but the frontal differs from that of Wesserpeton in the more tapered internasal process, the anterior contact between the ventrolateral crests, and the fact that the posterior margins of the prefrontal facets lie posterior to the mid-length of the bone; differs from Wesserpeton, Albanerpeton inexpectatum, Celtedens ibericus, and Anoualerpeton priscum, in having parietals with proportionally longer postorbital wings, the dorsal surfaces of which remain completely unsculptured; further differs from A. inexpectatum in lacking fusion of the prefrontal and lacrimal, having a bifurcate occipital shelf of each parietal, and in having a nasal that enters the narial margin. In the latter feature it resembles A. pannonicum, but differs in that the nasal makes a larger contribution to the narial margin; differs from both Neogene taxa in the lack of fusion of the basicranial and otic elements, the discrete supraoccipital, and the long anterodorsal process of the latter bone. The dentary and maxilla resemble Anoualerpeton spp. and differ from Wesserpeton, Celtedens, unattributed material from the Cretaceous of Uzbekistan (‘Nukusurus’), and Albanerpeton (except A. nexuosum) in showing size heterodonty with large anterior teeth supported by a convex profile of the labial alveolar margin. However, the maxilla of Shirerpeton is distinguished from that of Anoualerpeton spp and A. nexuosum by the combination of a pointed (rather than rounded) anterior premaxillary process and a weakly concave anterior narial margin. The dentary of Shirerpeton is distinguished from that of Anoualerpeton spp and A. nexuosum by the greater sinuosity of the labial dental margin (with a concave-convex-concave profile), the positioning of the prearticular facet behind the tooth row (rather than extending forward beneath it), and the shallow posterior inclination of the subdental shelf such that the posterior teeth are not markedly smaller than those in the symphyseal region. |
Measurements
No measurements are available
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| Source: subo = suborder, c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Uhen 2004, Carroll 1988 | |||||