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Aristonectes quiriquinensis
Taxonomy
Aristonectes quiriquiensis was named by Otero et al. (2014). Its type specimen is SGO.PV.957, a partial skeleton (Skeleton including the skull, atlas-axis, twelve anterior cervicals, 23 middle-to-posterior cervicals, most of the trunk, both almost complete forelimbs, and mo), and it is a 3D body fossil. Its type locality is Cocholgüe village, sea coast, which is in a Maastrichtian marine sandstone/sandstone in the Quiriquina Formation of Chile.
It was misspelled as Aristonectes quiriquinensis by Madzia and Cau (2020); it was corrected as Aristonectes quiriquinensis by Otero et al. (2015), Otero et al. (2015), O'Gorman et al. (2019), O'Gorman (2019), Otero (2024).
It was misspelled as Aristonectes quiriquinensis by Madzia and Cau (2020); it was corrected as Aristonectes quiriquinensis by Otero et al. (2015), Otero et al. (2015), O'Gorman et al. (2019), O'Gorman (2019), Otero (2024).
Synonymy list
| Year | Name and author |
|---|---|
| 2014 | Aristonectes quiriquiensis Otero et al. figs. 4-16 |
| 2015 | Aristonectes quiriquinensis Otero et al. p. 3 |
| 2015 | Aristonectes quiriquinensis Otero et al. p. 179 |
| 2019 | Aristonectes quiriquinensis O'Gorman |
| 2019 | Aristonectes quiriquinensis O'Gorman et al. |
| 2020 | Aristonectes quiriquinensis Madzia and Cau |
| 2024 | Aristonectes quiriquinensis Otero 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.
†Aristonectes quiriquinensis Otero et al. 2014
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. A. Otero et al. 2014 | A species within Aristonectes with the following unique combination of characters: head proportionally smaller than that of A. parvidens, having larger cervical vertebrae and the skull more reduced; presence of a mental boss on the anteroventral surface of the symphysis, which is not present in A. parvidens; absence of lingual platform in ventral view, which is present in A. parvidens (Gasparini et al., 2003a:fig. 2B); anterior portion of the mandible more dorsoventrally compressed than in A. parvidens (Gasparini et al., 2003a:fig. 2A); anterior teeth with sharp, slender shape (extreme expression of character 46, state 2, 'needle-like' in O'Keefe and Street, 2009); rib of the atlas-axis consisting of a large projection from the atlas intercentrum together with the axis rib, contrary to A. parvidens where the atlas intercentrum has only a small posterolateral process that covers the proximal part of the axis rib; ribs of first cervical vertebra shorter than those of A. parvidens, without fusion of their distal end with the rib of the third cervical; middle and posterior cervical vertebrae having neural spines and cervical ribs strongly angled anteriorly near 30°. Due to incomplete knowledge of the anatomy of A. parvidens, the following features are only tentatively diagnostic for the species: neural spines of posterior cervicals with an anterior left delicate bony flange and posterior right flange; humerus with hemispherical articular head; epipodials nearly 30% longer proximodistally than broad mediolaterally; lunate radius and ulna without distinctive middle notch; broad, polygonal centrale in the forelimb, broader mediolaterally than long proximodistally; fused carpals 2 + 3; forelimb with proximal phalanges spool-shaped but elongate, with expanded polygonal articular facets; scapulae having the acromion tuberosity displaced to the margin of the pectoral fenestra; coracoids with the following combination of features: high conical ventral processes not fused on the midline, while the dorsal surface is strongly fused; dorsal transverse process shallow, almost flat in aspect; typical elasmosaurid embayment (cordiform fenestra) between the coracoids on the posterior midline, but with midline fusion of the medial processes of the coracoids behind the cordiform fenestra. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Kiessling 2004 | |||||
Age range: Late/Upper Maastrichtian or 70.60000 to 66.00000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Maastrichtian | Chile | Mauisaurus sp. (91416) | |
| Late/Upper Maastrichtian | Chile (Biobio) | Aristonectes sp. (type locality: 150921) |