Sphenacodontidae, Marsh, 1878 sensu Benson, 2012
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publication ID |
https://doi.org/ 10.4202/app.2012.0105 |
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persistent identifier |
https://treatment.plazi.org/id/0383B94E-FC4D-FFCF-FC7E-0E4F2EF5F910 |
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treatment provided by |
Felipe |
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scientific name |
Sphenacodontidae |
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Sphenacodontidae indet. 2
Fig. 3B View Fig .
Material.— UM 5902 , partial right tooth-bearing dentary preserved mostly as an impression and exposed in medial view. Collected the 4 th and 8 th of March 1986 by Paul Ellenberger from east of Le Capitoul , Lodève Commune , Hérault Department , Languedoc Region , southern France; α or β bone breccia, lower Viala Formation , Autunian Group , Lodève ; Sakmarian, early Permian (see above) .
Description
Dentary.—The dentary is a long, ventrally bowed,tooth-bearing bone ( Fig. 3B View Fig ). Its medial surface is ornamented with low ridges radiating at the level of the caniniform but becoming parallel to the tooth row posteriorly. This sculpturing likely preserved traces of blood vessels supplying this area.
Dentition.— At least six teeth are present: five are preserved as impressions and a sixth one is represented distally by a fragmentary root. The most mesial tooth is identified as a probable caniniform. It is approximately twice the length of the preserved postcaniniforms. There is room for two additional teeth between the caniniform and postcaniniforms, and possibly two more mesial ones. The postcaniniforms decrease gradually in size distally. The teeth are conical, recurved distally, and end in a sharply pointed apex. The development of mesiodistal sharp edges gives the crown a bulbous aspect in lateral view. There are no visible serrations along these edges, but this might be due to the poor preservation.
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