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Cryopterygius kristiansenae
Taxonomy
Cryopterygius kristiansenae was named by Druckenmiller et al. (2012) [urn:lsid:zoobank.org:act:40BEB21D-3CFF-4D4B-A9D3-B2EA7AFC6575]. Its type specimen is PMO 214.578, a partial skeleton (a nearly complete skull, the entire presacral and preflexural vertebral column, numerous ribs and gastralia, most of the right and left pectoral girdle and limb), and it is a 3D body fossil. Its type locality is North side of Janusfjellet (Cryopterygius kristiansenae type), which is in a Tithonian deep-water mudstone in the Agardhfjellet Formation of Norway.
It was recombined as Undorosaurus kristiansenae by Delsett et al. (2019).
It was recombined as Undorosaurus kristiansenae by Delsett et al. (2019).
Synonymy list
| Year | Name and author |
|---|---|
| 2012 | Cryopterygius kristiansenae Druckenmiller et al. p. 313 figs. 2-11 |
| 2014 | Cryopterygius kristiansenae Arkhangelsky and Zverkov |
| 2016 | Cryopterygius kristiansenae Ji et al. p. 13 |
| 2019 | Undorosaurus kristiansenae Delsett 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.
†Cryopterygius kristiansenae Druckenmiller et al. 2012
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. S. Druckenmiller et al. 2012 | Large ophthalmosaurid ichthyosaur (estimated 5.5 metres total body length) with the following autapomorphies and unique character combinations: robust rostrum with snout ratio of 0.61 (relatively longer and more gracile in Aegirosaurus, Nannopterygius); orbital ratio of 0.19 (relatively larger in Ophthalmosaurus, Nannopterygius); supranarial process of premaxilla strongly reduced and not contacting the external naris (well developed supranarial process contacting the external naris in Brachypterygius and Caypullisaurus); subnarial process does not contact the jugal (contacts jugal in Brachypterygius); lacrimal does not contact the external naris (contacts external naris in Ophthalmosaurus, Caypullisaurus, Aegirosaurus, Sveltonectes); posterior margin of lacrimal forms distinct, nearly 90 degree angle (autapomorphic); maxilla with 23 teeth (10-13 in Ophthalmosaurus); maxilla with extensive lateral exposure along the tooth row, extending as far posteriorly as the midpoint of the orbit (shorter exposure laterally in Brachypterygius, Aegirosaurus, Ophthalmosaurus); jugal nearly straight (bowed in Aegirosaurus, Ophthalmosaurus); postorbital bar anteroposteriorly broad (narrow in Ophthalmosaurus, Aegirosaurus, Nannopterygius); element (supratemporal?) located posterior to the quadratojugal with a narrow, ventrally projecting process (autapomorphic); 53 teeth in upper tooth row (premaxilla and maxilla; 40 in Ophthalmosaurus); teeth relatively robust and large with numerous, fine, enamelled ridges (relatively smaller and more gracile in Aegirosaurus and Sveltonectes); 52 presacral vertebrae (42-43 in Ophthalmosaurus, 37(?) in Platypterygius americanus); conspicuous V-shaped notch along the dorsal margin of presacral neural spines as seen in lateral view (autapomorphic among ophthalmosaurids); ribs 8-shaped in cross section (round in Acamptonectes); relatively small forelimb bearing 5-6 digits (relatively larger with 6+ digits in Caypullisaurus, Platypterygius); humerus with two distal facets only (three facets in Ophthalmosaurus, Aegirosaurus, Caypullisaurus, Undorosaurus, Brachypterygius, Arthropterygius, Acamptonectes); rounded phalanges (rectangular in Platypterygius, Sveltonectes); ischiopubis expanded and unfused distally (unlike Ophthalmosaurus); femur anteroposteriorly broad with two facets distally (three distal facets in Platypterygius americanus, P. australis). |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Kiessling 2004 | |||||