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Marambionectes molinai

Osteichthyes - Plesiosauria - Elasmosauridae

Taxonomy
Marambionectes molinai was named by O’Gorman et al. (2024). Its type specimen is IAA-Pv 752, a partial skeleton (Incomplete skeleton comprising the basioccipital, mandible, isolated teeth, 48 cervical vertebrae, including the atlas-axis complex, two pectoral vertebrae, 14 ), and it is a 3D body fossil. Its type locality is Unit 9, Lopez de Bertodano, which is in a Maastrichtian marine sandstone/siltstone in the López de Bertodano Formation of Antarctica. It is the type species of Marambionectes.

Synonymy list
YearName and author
2024Marambionectes molinai O’Gorman et al. p. 4 figs. 2–6, 8, 9, 11A, B, 13E, J

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
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
genusMarambionectes
speciesmolinai

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.

†Marambionectes molinai O’Gorman et al. 2024
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Diagnosis
ReferenceDiagnosis
J. P. O’Gorman et al. 2024Elasmosaurid with one autapomorphy: 48 cervical vertebrae with a lateral keel in cervicals 5 to 29 but absent in posterior ones. The following combination of features also differentiates Marambionectes molinai from other elasmosaurids: three symphyseal alveoli in mandible; symphyseal angle of c. 100; wide symphyseal sulcus; high and triangular coronoid process; retroarticular process horizontally oriented; circular atlantal cup; rounded hypapophyseal keel on atlas-axis complex; cervical centra longer than high (middle cervical with VLI c. 97) and caudal centra without strongly laterally projected parapophyses.
Measurements
No measurements are available
Composition: hydroxyapatiteo
Environment: marineo
Locomotion: actively mobileo
Life habit: aquatico
Depth habitat: surfaceo
Diet: carnivoreo
Reproduction: viviparouso
Created: 2009-07-20 06:05:48
Modified: 2011-08-12 06:58:15
Source: o = order
Reference: Kiessling 2004

Age range: Late/Upper Maastrichtian or 72.20000 to 66.00000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Late/Upper Maastrichtian72.2 - 66.0Antarctica (Seymour Island) Marambionectes molinai (type locality: 234352)