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Aristonectidae (disused)
Taxonomy
Aristonectidae was named by O'Keefe and Street (2009). It is not extant. It was considered monophyletic by O'Keefe et al. (2011).
It was assigned to Tricleidia by O'Keefe and Street (2009); and to Cryptoclidia by O'Keefe et al. (2011).
It was assigned to Tricleidia by O'Keefe and Street (2009); and to Cryptoclidia by O'Keefe et al. (2011).
Synonymy list
| Year | Name and author |
|---|---|
| 2009 | Aristonectidae O'Keefe and Street |
| 2011 | Aristonectidae O'Keefe 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.
Fm. †Aristonectidae O'Keefe and Street 2009
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. O'Keefe and H. P. Street 2009 | "Cryptocleidoid plesiosaurs possessing the following unique combination of characters: rostrum relatively long but unconstricted and wide anteriorly, with a narrow symphysis (i.e., one symphysial tooth); paraoccipital process articulates with squamosal only; teeth small (crown length < 1 cm) and relatively narrow; number of premaxillary teeth seven or greater, number of maxillary teeth much greater than thirty; palate with a ventrally expanded boss projecting out of the plane of the palate between the posterior and anterior interpterygoid vacuity (if present); number of cervical vertebrae greater than 32; cervical vertebrae much wider than long; cervical vertebrae with poorly defined rims of articular surfaces (due to lack of ossification); marked dorso-ventral constriction of cervical centra on the ventral midline (‘binocular-shaped centra’) in derived members of clade; cervical neural arch and canal very small relative to centrum diameter." |