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Abyssosaurus
Taxonomy
Abyssosaurus was named by Berezin (2011). Its type is Abyssosaurus nataliae.
It was assigned to Aristonectidae by Berezin (2011); and to Cryptoclididae by Benson and Druckenmiller (2014).
It was assigned to Aristonectidae by Berezin (2011); and to Cryptoclididae by Benson and Druckenmiller (2014).
Species
A. nataliae (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2011 | Abyssosaurus Berezin p. 649 |
| 2014 | Abyssosaurus Benson and Druckenmiller figs. 2-3 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Y. Berezin 2011 | Large plesiosaur about 7 m long. Neck half of animal length. Apparently, number of cervical vertebrae, 51 (44 +); pectoral, 3; dorsal, 21; sacral, 3; and caudal, about 20 (5 +). Centra of cervical vertebrae ovate trapeziform, without compression in medial part, wider than long and as long as high. Articular surfaces slightly concave, with distinct sharp edges. Neural arch and canal small relative to diameter of centrum. Pre- and postzygapophyses of cervical vertebrae fused and articulated with neighboring vertebrae like spigot joint. Cervical ribs short, dorsoventrally compressed, with rounded ends. Dorsal vertebrae rapidly decreasing in size towards sacral region. Neural arches of dorsal vertebrae high, cerebrospinal canal wide, pre- and postzygapophyses also fused, transverse processes in high position. Interclavicle thickened and fused with clavicles, which turned in vertical plane, resembling ribs in shape. Scapulae widely spaced, without contact at midline. Dorsal ramus of scapula extended anteriorly, with ventrally curved anterior margin. Coracoid wide, probably without incisure in medial margin. Pubis wider than long. Central parts of gastralia thick and wide. Propodial bones massive, extended; articular surfaces for epipodial bones equal in length. Forelimbs much larger than hind limbs, having supplementary and perichondral bones. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Kiessling 2004 | |||||
Age range: Late/Upper Hauterivian or 136.40000 to 130.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Hauterivian | Russian Federation (Chuvash) | A. nataliae (121521) |