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Martinectes bonneri
Taxonomy
Trinacromerum bonneri was named by Adams (1997). Its type specimen is KUMNH 40002, a partial skeleton, and it is not a trace fossil. Its type locality is Johnson Ranch, Redbird, which is in a Campanian/Campanian marine horizon in the Pierre Shale Formation of Wyoming.
It was recombined as Dolichorhynchops bonneri by O'Keefe (2008); it was recombined as Martinectes bonneri by Clark et al. (2024).
It was recombined as Dolichorhynchops bonneri by O'Keefe (2008); it was recombined as Martinectes bonneri by Clark et al. (2024).
Synonymy list
| Year | Name and author |
|---|---|
| 1997 | Trinacromerum bonneri Adams pp. 183-191 figs. 2-14 |
| 2008 | Dolichorhynchops bonneri O'Keefe pp. 665-674 figs. 1-6 |
| 2024 | Martinectes bonneri Clark et al. p. 4 |
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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.
†Martinectes bonneri Adams 1997
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. O'Keefe 2008 | "Relatively large polycotylid plesiosaur possessing the following unique combination of diagnostic characters: Angulars reach forward to meet on the midline on the ventral surface of the mandible; teeth crowns large and broad relative to height; symphysis long; supraorbital mass present; anterior interpterygoid vacuity terminates posterior to internal nares; parasphenoid without anterior process projecting into anterior interpterygoid vacuity; pterygoid with lateral process carrying the ectopterygoid; lateral pterygoid plates narrow and not curved; dorsal vertebrae strongly compressed; humerus sigmoid but short and robust, with clear facets for supernumary ossifications; tongue-and-groove articulations between phalanges; ilium with a straight shaft and blunt proximal end; pubis lacks distinct lateral process." | |
| R. O. Clark et al. 2024 | Large dolichorhynchian polycotyline plesiosaur possessing the following autapomorphy: angular anteriorly surpasses splenial to enter mandibular symphysis. Also exhibits the following unique combination of traits: frontal has long anterior extension into the rostrum, supraorbital ledge present over anterodorsal corner of orbit, parietal crest rises gradually at anterior end, parietal crest high and arched, pterygoid anterior processes terminally fuse and split the median symphysis of the vomers in their posterior margin, pterygoid posteriorly forms plate with squared lateral margin, pterygoid has posterior extension level with the occipital condyle, parasphenoid has cultriform process projecting into the anterior interpterygoid vacuity, ectopterygoid extends anteriorly to suture with lateral surface of palatine, paroccipital process has two distal articulation facets, suspensorium vertical, articular composes majority of retroarticular process dorsal margin, 21 cervical vertebrae, scapula has bent dorsal process, ilium straight rather than tapering dorsally, humerus epipodial rowhas five ossifications, femur wide (length to width ratio under 1.8). |