Lamniformes Compagno 1973
Lamniformes Compagno 1973
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Paleogene was a time of lamniforms', especially odontaspidids', well-being. Their teeth constitute the majority of all the teeth in the sands, and the biggest specimens occur among them.
Several percent of these teeth are pretty complete.
Stereopair
Striatolamia macrota (Agassiz, 1843).
An anterior.
The same species.
This one worked more hardly, judging from the scratches.
Notice tiny cusplets, obviously unfunctional on this tooth.
Striatolamia.
Stereopairs:
The same genus, lateral tooth.
A specimen with big round cusplets.
Striatolamia macrota: twice smaller tooth.
Notice tiny wrinkles on the base of the labial side.
Striatolamia tooth with wide low cusplets
Striatolamia: a posterior with strong labial wrinkles.
Strongly striated thin tooth.
Odontaspididae? Mitsukurinidae?
Jaekelotodus trigonalis (Jaekel, 1895)
Jaekelotodontidae Glückman 1964 or Odontaspididae Müller & Henle 1839
Jaekelotodus.
Unusually small and somewhat strangely shaped.
Juvenile? Intermediate?
Intermediate tooth (some sandshark?)
Another intermediate tooth
Odontaspididae Müller & Henle 1839 (certain)
Odontaspididae Müller & Henle 1839 (certain)
Odontaspis Agassiz 1838. A lower tooth.
Odontaspis-like tooth. Lower one.
Cutting edge is complete and somewhat serrated at the base.
Brachycarcharias lerichei
(Casier, 1946).
An anterior.
Stereopair:
Another interesting specimen.
Hypotodus verticalis (Agassiz, 1843) (?)
Note "leopard" spot pattern, best seen on the labial side.
Labial side stereo.
3-dimensional look shows that spots are not on the enameloid, but inside the tooth: on dentine/enameloid boundary. They seem to reflect structure of osteodentine, not to be simple common stains around small scratches.
A tooth with double cusplets from some sand shark
One more from a sand shark. Typical anterior...
And posterior.
Symphyseal.
Notice double cusplets and short wrinkles on the labial side.
Another one.
Symphysials are found unproportionally more rarely than anteriors and laterals.
Mitsukurinidae Jordan 1898 (certain)
Mitsukurinidae Jordan 1898 (certain)
Anomotodon sheppeyensis (Casier, 1966). Small one.
Bigger one from the same species.
Notice strong striations, even below the crown.
Such teeth are rare in these places.
The same species.
Note hardly visible mesial cusplet and lingual striations (only along the edges).
Somewhat more common, but still scarce kind of teeth.
Lamnidae Müller & Henle 1838
Lamnidae Müller & Henle 1838
Isurolamna affinis (Casier, 1946). Relatively common teeth.
A lateral with prominent second pair of cusplets.
Twice smaller tooth. The same species?
Isurolamna affinis. Anterior.
A well-preserved elegant tooth. These teeth with "inflated" root and narrow labial side are easy to recognize.
Similar, but eroded one. The same species.
Isurolamna affinis anterior
Macrorhizodus praecursor
(Leriche, 1905)
The same species
Macrorhizodus praecursor
Xiphodolamia ensis Leidy, 1877. An anterior.
Teeth, which can not be confused with anything. And can be at a glimpse identified to species due to work of Adnet et al. (2009), who merged 3 species of this genus into one.
One more Xiphodolamia anterior.
Less complete, but remarkably big one: almost 3 cm in max. length.
Unlike previous specimen, it lacks second cutting edge completely.
Xiphodolamia. Probably, more distal.
Strongly asymmetric tooth with both cutting edges complete.
Xiphodolamia lateral. With distinctive flat root.
Otodontidae Glückman 1964
Otodontidae Glückman 1964
Otodus Agassiz 1843
An anterior tooth. Any serrations are absent.
Otodus. A lateral tooth.
Notice that only lateral cusplets and the base of main cusp are serrated.
Otodus: one more
The biggest tooth in the collection.
Fine serrations are present along whole edge.
The same genus.
Such serrated teeth are rare in these places.
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