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Kawanectes lafquenianum

Reptilia - Plesiosauria - Elasmosauridae

Taxonomy
Trinacromerum lafquenianum was named by Gasparini and Goni (1985). Its type specimen is MLP 71-II-13-1, a set of postcrania, and it is a 3D body fossil. Its type locality is Quarry of the “Bentonitas Patagónicas” company, which is in a Campanian/Maastrichtian marginal marine claystone/siltstone in the Allen Formation of Argentina.

It was considered a nomen dubium by Gasparini and Salgado (1999); it was recombined as Kawanectes lafquenianum by O'Gorman (2016), O'Gorman (2016), O'Gorman et al. (2019), O'Gorman (2019), O'Gorman (2020) and O'Gorman (2021).

Synonymy list
YearName and author
1985Trinacromerum lafquenianum Gasparini and Goni
1985Trinacromerum lafquenianum Gasparini and Goñi
2016Kawanectes lafquenianum O'Gorman
2019Kawanectes lafquenianum O'Gorman
2019Kawanectes lafquenianum O'Gorman et al.
2020Kawanectes lafquenianum O'Gorman
2021Kawanectes lafquenianum O'Gorman

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
RankNameAuthor
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
suborderSauropterygia
orderPlesiosauriade Blainville 1835
superfamilyPlesiosauroideaWelles 1943
familyElasmosauridaeCope 1869
—Weddellonectia
genusKawanectes
specieslafquenianum(Gasparini and Goni 1985)

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.

†Kawanectes lafquenianum Gasparini and Goni 1985
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Diagnosis
ReferenceDiagnosis
J. P. O'Gorman 2020Small-bodied elasmosaurid (approximately 3.8 m in maximum length) differring from other elasmosaurid taxa based on the following state combination: coronoid process triangular in shape with a high and pointed dorsal extremity; short symphysis incorporating 2.5 alveolar spaces; cervical centra longer than high with a prominent lateral keel; laterally projecting parapophyses on the caudal vertebrae developed into a conspicuous knob; pelvic bar present; ilium with slightly expanded and laterally compressed distal end; ilium with v-shaped sacral facet restricted to the medial face of the expanded distal extremity and delimited ventrally by a medial knob; humerus with large posterodistal projection supporting an articular facet for a proximal supernumerary ossification; distinct depression present anterior to the main muscle scar on ventral surface of the humerus; humerus/femur length ratio (1.2); femur with a strongly convex capitulum.