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Taxonomy
Meyasaurus was named by Vidal (1915). It is not extant.
It was assigned to Sphenodontidae by Cocude-Michel (1963) and Carroll (1988); to Squamata by Bolet and Evans (2010); to Lacertoidea by Evans and Barbadillo (1997) and Houssaye et al. (2013); and to Teiidae by Venczel and Codrea (2016).
It was assigned to Sphenodontidae by Cocude-Michel (1963) and Carroll (1988); to Squamata by Bolet and Evans (2010); to Lacertoidea by Evans and Barbadillo (1997) and Houssaye et al. (2013); and to Teiidae by Venczel and Codrea (2016).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1915 | Meyasaurus Vidal |
| 1963 | Meyasaurus Cocude-Michel |
| 1966 | Ilerdaesaurus Hoffstetter |
| 1979 | Rubiessaurus Gomez Pallerola p. 341 |
| 1983 | Ilerdaesaurus Estes |
| 1988 | Ilerdaesaurus Carroll |
| 1988 | Meyasaurus Carroll |
| 1997 | Meyasaurus Evans and Barbadillo |
| 2010 | Meyasaurus Bolet and Evans |
| 2013 | Meyasaurus Houssaye et al. |
| 2016 | Meyasaurus Venczel and Codrea |
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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. †Meyasaurus Vidal 1915
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†Meyasaurus crusafonti Hoffstetter 1966
†Meyasaurus diazromerali Evans and Barbadillo 1997
†Meyasaurus faurai Vidal 1915
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Invalid names: Rubiessaurus lapicidinarum Gomez Pallerola 1979 [synonym]
†Meyasaurus unaensis Richter 1994
Invalid names: Ilerdaesaurus Hoffstetter 1966 [synonym], Rubiessaurus Gomez Pallerola 1979 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. E. Evans and L. J. Barbadillo 1997 | Dorsal roofing bones with vermiculate sculpture; premaxilla unpaired, long nasal process, about nine small, unicuspid teeth; maxilla with medial shelf and broad premaxillary process, but no vomerine lappet; dentary long, strong subdental shelc pleurodont teeth with iguanid replacement pattern; teeth, unicuspid anteriorly, bicuspid posteriorly with strong central cusp and anterior cusplet; small paired nasals, almost or fully separated from the prefrontal by frontomaxillary contact; frontal constricted between orbits, cristae cranii well developed, deepen anteriorly but do not meet ventrally; frontal with long anterolateral and small anteromedial processes; frontal wide posteriorly, bearing triangular ventral facets for parietal lappets; parietal unpaired, central parietal foramen, strong ventrolateral margins and some development of ventral flanges; postparietal processes long, deep and divergent; jugal with deep anterior process which excludes maxilla from orbital rim, short posterior process, and long orbital process which probably failed to meet the squamosal; postfrontal and postorbital separate; postfrontal small, semilunate with short lateral process to postorbital; postorbital mainly an orbital bone but with strong posterior process; squamosal large with long anterior process, medial flange (= dorsal process) and hooked lateral process; supratemporal present; quadrate with lateral conch but lappet for pterygoid small at best; epipterygoid columnar; pterygoids large, strong oblique suture with palatine, large pterygoid flange; sphenoid with short expanded basipterygoid processes and ossified rostrum; basioccipital apparently entered lower border of fenestra rotunda; postdentary bones strong; adductor fossa open, quite expanded; slight prearticular crest which excludes angular process; angular process triangular; splenial large; coronoid with deep medial process, short posterior process, anterior process above splenial, and small lateral flange; retroarticular process short; vertebral centra weakly procoelous, rather square centra, last few presacrals shorter thanpreceding; 25 presacrals - 8 cervical, 17 dorsal - all but first three bearing free ribs; cervical vertebrae short, the first five at least bearing hypapophyses, with two separate hypapophyses on axis; low neural spines; first three cervical ribs short and expanded; three sternal ribs, two attaching to xiphisternum; remaining ribs sharply divided between six long abdominal ribs and six short presacral ribs; sacrals may be fused distally to enclose a foramen sacrale; anterior caudals with transverse processes; first autotomy septum on caudal vertebra six, passing posterior to transverse process; all posterior caudals autotomous; scapulocoracoid with scapular, scapulocoracoid and two anterior coracoid emarginations; interclavicle cruciform; clavicles perforate, with incomplete medial borders (anterior ramus longest and ending in expansion) and thickened stem; cartilaginous sternal plate rhomboid without sternal fontanelle, bearing attachment points for three sternal and two xiphisternal rib pairs; humerus of moderate length, expanded ends; hands moderately long (around 1.5 X humeral length), phalangeal formula 2:3:4:5:3; ilium with long slender blade; pubis with obturator foramen and short triangular pubic tubercle, proximally placed but withsome ventral displacement; femur robust, tibia and fibula shorter; astragalocalcaneum fused in adult, bearing proximal crest which articulates with notched distal tibial epiphysis; large dt4, smaller dt3, dt2 apparently absent; mt5 short and hooked in two planes; long metapodials, mt4 equal or subequal in length to mt3; pedal phalangeal formula 2:3:4:5:4. |