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Pteraichnus nipponensis
Taxonomy
Pteraichnus nipponensis was named by Lee et al. (2010). It is considered to be a form taxon. Its type specimen is FPDM-F022-1, a footprint (Five trackways), and it is a trace fossil. Its type locality is Kitadani tracksite, which is in an Aptian fine channel fill siltstone in the Kitadani Formation of Japan.
Synonymy list
| Year | Name and author |
|---|---|
| 2010 | Pteraichnus nipponensis Lee et al. pp. 264-265 figs. 4-7 |
| 2015 | Pteraichnus nipponensis Li et al. p. 269 |
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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.
†Pteraichnus nipponensis Lee et al. 2010
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| Y.-N. Lee et al. 2010 | Quadruped track; manus print more laterally to the pes print; pes print anterior to the manus print; the asymmetrical manus track with three digit imprints; anteriorly oriented digit I imprint with a medially oriented hook-like sharp claw mark; anteriorly curved tip of digit II imprint; posteriorly oriented and nearly straight or slightly medially curved digit III; digit III over 1.5 times longer than digit I and II which are nearly same in length; divarication of digit I and III impressions is very high (average 155.4); the metacarpo-phalangeal joint depression is shallower than the digital impressions; triangular, elongate and fully plantigrade and tetradactyl pes print; laterally curved four claw marks; interdigital webbing extended from the metatarso-phalangeal joint near to the bases of the claws; the divarication of digit I and II impressions smaller than that between II and III, III and IV; the digit I imprint is the shortest and other three digit imprints roughly subequal in length; the metatarso-phalangeal joint part usually wider and deeper than the heel of the pes. |
Measurements
No measurements are available
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| Source: o = order, c = class, subp = subphylum | |||||
| References: Carroll 1988, Padian 1985, Hendy et al. 2009 | |||||