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Acteosaurus tommasinii
Taxonomy
Acteosaurus tommasinii was named by Meyer (1860). Its type specimen is MCSNT 9960, a partial skeleton (articulated postcranial skeleton comprising anterior-most cervical and posterior-most caudal vertebrae, and portions of the pectoral and pelvic girdles. Both th), and it is a 3D body fossil. Its type locality is Komen, which is in a Cenomanian marginal marine limestone in Slovenia.
Synonymy list
| Year | Name and author |
|---|---|
| 1860 | Acteosaurus tommasinii Meyer |
| 1928 | Acteosaurus tommasinii Perrier p. 3091 |
| 2004 | Acteosaurus tommasinii Caldwell and Lee p. 617 |
| 2010 | Acteosaurus tommasinii Palci and Caldwell |
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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.
†Acteosaurus tommasinii Meyer 1860
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Palci and M. W. Caldwell 2010 | Acteosaurus tommasinii shares with other basal ophidiomorphs (e.g., Dolichosaurus, Adriosaurus, Pontosaurus) the following characters: slender body with over 25 dorsal vertebrae (27) and 10 or more cervical vertebrae; hind limbs and especially forelimbs reduced in size, with a femur/mean dorsal vertebra length (mdv) ratio = 2.7 as compared to a humerus/mdv ratio = 1.3; well-developed, triangular posterodistal process of fibula that extends posteriorly beyond
calcaneum; haemal arches articulated (not fused or sutured) to posteroventral region of caudal vertebrae; flat pubic bone with well-developed, square pubic process and narrow subrectangular descending ramus; and neural spines on caudal vertebrae long and narrow in lateral view. Unique characters that set this taxon apart from all other known basal ophidiomorps are as follows: neural arches in dorsal region not mediolaterally constricted at mid-length but instead further posteriorly (just anterior to small postzygapophyses); postzygapophyses in dorsal region small and subtriangular in dorsal view; absence of pachyostosis on both vertebrae and ribs; and relatively shorter and more gracile forelimbs differentiate this taxon from Adriosaurus suessi (in which femur/mdv = 3.3–3.6 and humerus/mdv = 1.6–2.2). |