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Mixosaurus luxiensis
Taxonomy
Mixosaurus luxiensis was named by Fang et al. (2024). Its type specimen is HFUT HL-21-08-002, a skeleton (A nearly complete skeleton, with the postcranium mostly disarticulated), and it is a 3D body fossil. Its type locality is Huale Village, Luxi County, which is in an Anisian marine lime mudstone/mudstone in the Guanling Formation of China.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2024 | Mixosaurus luxiensis Fang et al. p. 266 figs. 2-7 |
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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.
†Mixosaurus luxiensis Fang et al. 2024
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| Y.-W. Fang et al. 2024 | A species of Mixosaurus characterised by the following combination of character states: anterior terrace of supratemporal fenestra reaching only the most posterior
part of nasal (anterior terrace reaches the level of the external naris in M. panxianensis, M. cornalianus, and M. kuhnschnyderi); postorbital broad and postorbital portion of the skull around half the length of the orbit (similar to M. panxianensis and “M. xindianensis”, proportionally longer than in M. cornalianus and M. kuhnschnyderi); jugal without posteroventral process (variable in M. panxianensis, absent in M. cornalianus); no distinct plicidentine (also absent in M. cornalianus, present in M. panxianensis); anterior teeth slender and remarkably small (similar to M. cornalianus, different from M. panxianensis and M. kuhnschnyderi, in which the anterior dentition is relatively larger); dentition weakly heterodontous, posterior teeth robust but pointed (similar to M. cornalianus, different from “M. xindianensis”, M. panxianensis, and M. kuhnschnyderi, in which the posterior teeth are molariform and mesiodistally elongated); centrum height/length ratio varying from <1.5 (anterior dorsal) to 2.0 (postflexural caudal) (up to 2.0 for M. cornalianus [Schmitz et al. 2004; Schmitz 2005], higher than 2.0 in M. panxianensis [Zang 2014], M. kuhnschnyderi [Brinkmann 2004], and “M. xindianensis” [Chen and Cheng 2010]); radius narrow (proximodistal length/midshaft width ratio = 2.4; 1.5–1.9 for M. panxianensis and M. cornalianus), carrying two notches on the leading edge (present in M. panxianensis, variable in M. cornalianus, absent in M. kuhnschnyderi and “M. xindianensis”); single notch on the posterior margin of the ulna (present in “M. xindianensis”, rarely occurring in M. panxianensis, absent in M. cornalianus, M. kuhnschnyderi, and “M. xinzhaiensis”); metacarpal V larger in size than distal carpal IV and probably bearing a notch (small and without notch in other Mixosaurus species, but similar in size and morphology to the Luoping specimen of Phalarodon atavus [Liu et al. 2013]); proximal phalanges in digit 1 well-emarginated at the leading edge of the forefin (anterior margin complete in M. cornalianus, also emarginated in M. panxianensis and “M. xinzhaiensis”). Except for displaying the diagnostic features of Mixosaurus, HFUT HL-21-08-002 possesses the following character states inconsistent with a referral to Phalarodon: narial shelf and buccal ridge absent; dental groove present posteriorly; dentary labial shelf absent; plicidentine absent. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Kiessling 2004 | |||||