Description: The teeth of the angel shark possess a main cusp, which is angled lingually, and no cusplets.  The concaved solid and diverging root accounts for most of the size of the tooth.  The main cusp is short and narrow, but expands along the arched root along the back of the tooth.  Angel shark teeth are only about 4 to 5 mm (about .25 in) long, which make them hard to recover from the stream because they fall through most inch screens.  This probably makes their teeth appear less common than they really are.  However, they appear to be more common when digging in situ.

The vertebra that are attributable to the angel shark are similar to other shark vertebra.  They have a rounded rectangular shape with calcified cartilage on the sides. The most distinctive feature is that the anterior surface is smaller than the posterior surface.

Commonality: The teeth of the angel shark are uncommon from the stream bed but are more common when recovered from in situ.  Vertebra centra that are attributable to this shark are rare due to their fragile nature.

Similar fossils: Their teeth may be small, but they are very distinctive and are rarely confused with other locality teeth.

Size: Their maximum length was about 1 to 2 meters (3 to 7 feet).

Notes: Modern angel sharks are flattened bottom dwellers that prefer shallow to medium depth water and resemble skates and rays.  In fact, it is believed that skates and rays evolved from the close relatives of the angel shark.  Their diets probably consisted of crustaceans, crabs, and bottom dwelling fishes, as their modern day counterparts do today.  The angel sharks were widespread worldwide during the Cretaceous.
Angel Shark
Squatina hassei Leriche
Squatina hassei Leriche
Tooth
a. lingual   b. labial  c. side
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Squatina hassei Leriche
Typical vertebra
a. Front  b. Side  c. Back
Squatina hassei Leriche
Atlas vertebra
a. Front  b. Bottom  c. Back
Squatina hassei Leriche
Tooth
a. lingual   b. labial