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Argovisaurus martafernandezi
Taxonomy
Argovisaurus martafernandezi was named by Miedema et al. (2024). Its type specimen is PIMUZ A/III 5279, a partial skeleton, and it is a 3D body fossil. Its type locality is Oberegg north of Auenstein, which is in a Bajocian/Bathonian deep subtidal marl in the Hauptrogenstein Formation of Switzerland. It is the type species of Argovisaurus.
Synonymy list
| Year | Name and author |
|---|---|
| 2024 | Argovisaurus martafernandezi Miedema et al. p. 4 figs. 1, 3, 4, 5, 7, 8, 10, 9, 11, 12, 13 and 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.
†Argovisaurus martafernandezi Miedema et al. 2024
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. Miedema et al. 2024 | A large ophthalmosaurian characterized by the following unique combination of characters: basioccipital with reduced extracondylar area (shared with Mollesaurus); basioccipital peg reduced and not reaching further anteriorly than basisphenoid facet (difers from nonophthalmosaurian parvipelvians); basioccipital large anterior notochord pit (present but relatively smaller in Arthropterygius chrisorum, Ophthalmosaurus icenicus); parabasiphenoid basipterygoid processes
projected latero-anteriorly (shared with Ichthyosaurus, Sveltonectes, Baptanodon and possibly Mollesaurus); supraoccipital antero-posteriorly elongated (possible autapomorphy); stapes with ofset dorsally projected opisthotic facet (possible autapomorphy); quadrate without distinct occipital lamella (shared with Stenopterygius, diferent from most ophthalmosaurs) and with a small angular process (shared with Nannopterygius, Undorosaurus gorodischensis, Arthropterygius volgensis and Palvennia); premaxilla/dentary asymmetrically developed, premaxilla with tapering anterior end, dentary with rounded blunt end; both with pseudoalveoli present anteriorly, but not posteriorly (anterior pseudoalveoli shared with Temnodontosaurus trigonodon, O. icenicus); premaxilla with sub- and supranarial processes present and equal in length (shared with Platypterygius australis, notably diferent from Stenopterygius and O. icenicus); jugal with little curvature and broad posterodorsal fange (as in Pl. australis, but unlike O. icenicus, Ar. lundi, the referred specimen of Muiscasaurus catheti and Stenopterygius); quadratojugal with quadrate facet posteriorly directed and parallel to the ventral margin (potential autapomorphy); clavicle with broad medial sheet and short distal process (shared with Nannopterygius, Talassodraco and Ar. lundi); ribs antero-dorsal ribs with heads connected by a sheet of bone (as in Eurhinosaurus, difering from Stenopterygius and all ophthalmosaurs which have widely separated rib heads); ribs rounded in cross section with distal grooves in dorsal ribs, similar to Mollesaurus, fgure-eight shaped in Stenopterygius, O. icenicus, and many others). |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Kiessling 2004 | |||||
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Bajocian - Bathonian | Switzerland (Brugg) | Argovisaurus martafernandezi (type locality: 234449) |