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Arthropterygius lundi

Osteichthyes - Ophthalmosauridae

Taxonomy
Janusaurus lundi was named by Robert et al. (2014) [urn:lsid:zoobank.org:act:71E65B35-7215-44AA-BCE7-E9A3B265E04F; = v. Arthropterygius sp., Zverkov, Arkhangelsky, Pardo Pérez, Beznosov 2015: 84, figs. 3–7.]. Its type specimen is PMO 222.654, a partial skeleton (an incomplete skeleton consisting of a partial skull, representative cervical, dorsal and caudal vertebrae, a nearly complete pectoral girdle and left forefin, ), and it is a 3D body fossil. Its type locality is North side of Janusfjellet, which is in a Tithonian offshore shelf mudstone in the Agardhfjellet Formation of Norway.

It was recombined as Arthropterygius lundi by Zverkov and Prilepskaya (2019).

Entered
by R. Benson on 2014-08-04; modified by P. Wagner on 2021-01-16

Synonymy list
YearName and author
2014Janusaurus lundi Robert et al. p. 4 figs. 3-14
2019Arthropterygius lundi Zverkov and Prilepskaya pp. 40-41 figs. 11B, 11C, 13–15

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
RankNameAuthor
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
—Ichthyosauromorpha
—Ichthyosauriformes
—Ichthyopterygia(Owen 1840)
—Eoichthyosauria
—Ichthyosauria(de Blainville 1835)
—Baracromia
familyOphthalmosauridaeAndrews 1910
genusArthropterygius
specieslundi()

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.

†Arthropterygius lundi Robert et al. 2014
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Diagnosis
ReferenceDiagnosis
A. J. Robert et al. 2014A moderately sized ophthalmosaurid (estimated body length of 3-4 meters) possessing the following autapomorphies (marked with *) and unique character combinations: maxilla with extensive lateral exposure (short in Ophthalmosaurus and Aegirosaurus); lacrimal contributes to the posterior margin of the external naris (excluded in Cryopterygius and Athabascasaurus); posterodorsal process of jugal forming half of the posterior margin of the orbit (does not form any of the margin in Cryopterygius); narrow postorbital bar (broad in Cryopterygius, Athabascasaurus and Brachypterygius); absence of a squamosal (present in Athabascasaurus and Aegirosaurus); extremely gracile and constricted stapedial shaft*; reduced ophisthotic facet on the basioccipital (large in Palvennia); presence of an angular-articular contact*; extremely gracile dentition (more robust in Cryopterygius and Brachypterygius); interclavicle with an interclavicular trough and ventral foramen*; proximodistal length of scapula very reduced in comparison to coracoid length*; humerus with three distal facets (two in Nannopterygius and Cryopterygius); ulna is the largest element of zeugopodium (radius is larger in Cryopterygius); anterodorsal process of the ilium*; ischiopubis completely fused and lacking an obturator foramen (unfused distally in Cryopterygius and Undorosaurus and oburator foramen present in Ophthalmosaurus); femur with two distal facets (three in Platypterygius americanus and Platypterygius australis).