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Megalancosaurus
Taxonomy
Megalancosaurus was named by Calzavara et al. (1981). Its type is Megalancosaurus preonensis.
It was assigned to Pseudosuchia by Calzavara et al. (1981); to Thecodontia by Carroll (1988); to Megalancosauridae by Renesto (1994); to Drepanosauridae by Renesto (2000), Senter (2004), Renesto and Dalla Vecchia (2005) and Dalla Vecchia (2006); and to Megalancosaurinae by Renesto et al. (2010).
It was assigned to Pseudosuchia by Calzavara et al. (1981); to Thecodontia by Carroll (1988); to Megalancosauridae by Renesto (1994); to Drepanosauridae by Renesto (2000), Senter (2004), Renesto and Dalla Vecchia (2005) and Dalla Vecchia (2006); and to Megalancosaurinae by Renesto et al. (2010).
Species
M. endennae, M. preonensis (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1981 | Megalancosaurus Calzavara et al. |
| 1988 | Megalancosaurus Carroll |
| 1994 | Megalancosaurus Renesto |
| 2000 | Megalancosaurus Renesto |
| 2004 | Megalancosaurus Senter p. 260 |
| 2005 | Megalancosaurus Renesto and Dalla Vecchia |
| 2006 | Megalancosaurus Dalla Vecchia |
| 2010 | Megalancosaurus Renesto et al. p. 59 |
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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. †Megalancosaurus Calzavara et al. 1981
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†Megalancosaurus endennae Renesto et al. 2010
†Megalancosaurus preonensis Calzavara et al. 1981
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. Calzavara et al. 1981 | Reptile of small size, with triangular diapsid skull and a large semielliptical naris; premaxilla with a "beak-like" tip of the snout; trapezoidal preorbital opening; large subcircular orbital; small upper and probably large lower temporal opening; jugal triradiate; about 30 teeth in each part of the upper and 25 teeth in the lower jaw; dentition thecodont or prothecodont; teeth small, sharp pointed and isodont; fore-limbs of remarkable size, lower arm elongated; hand with 3 or ?4 carpalia and 5 digits with the phalanx formula 2-2-3-3-3; claws hooked, large and sharp pointed; first 3 digits probably opponible to the other 2; 6 cervical vertebrae, 4 of them elongated; pubis rod-like, elongated and approached to the ischium. |
Measurements
No measurements are available
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| Source: g = genus, subc = subclass, c = class, subp = subphylum | |||||
| References: Renesto 2000, Carroll 1988, Hendy et al. 2009 | |||||
Age range: Alaunian or 215.56000 to 212.00000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Alaunian | Italy (Lombardia) | M. preonensis, M. endennae (36377) | |
| Alaunian - Sevatian | Italy (Friuli-Venezia Giulia) | Drepanosaurus unguicaudatus (83780) M. preonensis (83472 83574) |