Paratriakis curtirostris ( Davis, 1887 )
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publication ID |
https://doi.org/ 10.4202/app.2012.0123 |
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persistent identifier |
https://treatment.plazi.org/id/C45E8796-6968-1967-FFDB-3F58FA64B72B |
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treatment provided by |
Felipe |
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scientific name |
Paratriakis curtirostris ( Davis, 1887 ) |
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Paratriakis curtirostris ( Davis, 1887)
Fig. 9H, I View Fig .
Material.— 45 specimens teeth from the Ce of Stevns Kridtbrud ( MGUH 29879 View Materials , MGUH 29880 View Materials , GMV2012-79 [batch number]) and one from the Br 2 at Faxe ( GMV2012-80 ) .
Description.—Teeth displaying little monognathic heterodonty. Strongly labio-lingually compressed teeth and all wider than high. Teeth with a single cusp strongly inclined towards the commissure. The mesial cutting edge is straight at an angle of 40 to 50° to the basal edge of the crown, but turning upwards at the apex of the main cusp. The distal cutting edge of the cusp is convex, joining the distal shoulder in a notch. The distal shoulder is at a near right angle to the distal edge of the crown in anterior teeth, but somewhat less in lateral teeth. The apex of the cusp never protrudes further distally than the distal edge of the crown.The labial face of the cusp is smooth and convex, but is at an angle with the body of the crown, creating a small mesio-distal trough. The basal edge of the crown strongly overhangs the root and creates a ledge. The lingual face of the crown is convex and smooth. The labial face of the root is very low with multiple foramina; the basal face of the root is flat and tapering at both ends. The basal edge of the roots has a deep median notch. The lingual face of the root is low and with a median protuberance and a median foramina. Anterior teeth have a smaller height to width ratio than lateral and posterior teeth. Teeth reaching up to 1.3 mm in height and 2.5 mm in width.
Remarks.—Body fossils of P. curtirostris are known from Sahel Alma in Lebanon ( Davis 1887; Cappetta 1980), so the dentition in this particular species is well known, although our knowledge of intraspecific variability is limited.
Unidentified material
In addition to the material described and illustrated above, several large unidentifiable fragments of selachian teeth> 15 mm were also collected, indicating that larger sharks were more numerous than the identifiable teeth may indicate. Furthermore, numerous osteichthyan bones, jaws, vertebrae and teeth all less than 4 mm in length were recovered.
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