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Maiaspondylus
Taxonomy
Maiaspondylus was named by Maxwell and Caldwell (2006).
It was assigned to Ophthalmosauria by Maxwell and Caldwell (2006), Druckenmiller and Maxwell (2010); to Ophthalmosauridae by Maisch (2010), Fischer et al. (2011), Fischer et al. (2013); and to Platypterygiinae by Fischer et al. (2012), Arkhangelsky and Zverkov (2014), Robert et al. (2014), Zverkov and Grigoriev (2020).
It was assigned to Ophthalmosauria by Maxwell and Caldwell (2006), Druckenmiller and Maxwell (2010); to Ophthalmosauridae by Maisch (2010), Fischer et al. (2011), Fischer et al. (2013); and to Platypterygiinae by Fischer et al. (2012), Arkhangelsky and Zverkov (2014), Robert et al. (2014), Zverkov and Grigoriev (2020).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2006 | Maiaspondylus Maxwell and Caldwell p. 1044 |
| 2010 | Maiaspondylus Druckenmiller and Maxwell |
| 2010 | Maiaspondylus Maisch |
| 2011 | Maiaspondylus Fischer et al. |
| 2012 | Maiaspondylus Fischer et al. |
| 2013 | Maiaspondylus Fischer et al. |
| 2014 | Maiaspondylus Arkhangelsky and Zverkov |
| 2014 | Maiaspondylus Robert et al. p. 22 fig. 15 |
| 2020 | Maiaspondylus Zverkov and Grigoriev |
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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.
G. †Maiaspondylus Maxwell and Caldwell 2006
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†Maiaspondylus lindoei Maxwell and Caldwell 2006
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| N. G. Zverkov and D. V. Grigoriev 2020 | Modest sized platypterygiine ichthyosaurian not exceeding 3e4 m in maximum estimated length and charac- terized by the unique quadrate and humeral morphology and a peculiar forefin structure: quadrate with stapedial facet ventrally surrounded by a high ridge; stout humerus with well-developed plate-like trochanter dorsalis and deltopectoral crest (as in many Cretaceous platypterygiines and some species of Nannopterygius [Zverkov & Jacobs, 2020]), three distal humeral facets nearly equal in size (as in ophthalmosaurine Arthropterygius chrisorum [see Zverkov & Prilepskaya, 2019]) and, in the type species, the fourth minor preaxial facet for the second anterior accessory epipodial element; ulnar facet deflected posterodistally, radial facet facing distally, or slightly inclined posterodistally and preaxial accessory facets more or less deflected anterodistally; free margins of anterior and posterior facets are rounded; distal facets are concave; the radial facet is widest dorsoventrally thus forming a skew of the ventral surface between the radial and ulnar facets, not as pronounced but similar to Sisteronia (Fischer et al., 2014a) and Arthropterygius (Zverkov & Prilepskaya, 2019); extreme poly- dactyly with nine or more digits in the forelimb of which three preaxial and no less than two postaxial digits; epipodial to authopodial elements are dorsoventrally thickened, tightly packed (unlike in ophthalmosaurines); most of the autopodial elements are squared in dorsal view. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Kiessling 2004 | |||||
Age range: Middle Albian or 109.00000 to 105.30000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Albian | Canada (Northwest Territories) | M. lindoei (94490) |