1. Angel Sharks

2. OK, Family Squatinidae Class: Chondrichthyes Subclass: Elasmobranchii Order: Squatiniformes Family: Squatinidae Genus: Squatina 17 species Squatina tergocellata

3. Characteristics Dorso-ventrally flattened body Large Pectorals not attached to head No Anal fin, 2 dorsal fins Hypocercal tail with large lower lobe Dorsal eyes, Large dorsal spiracles Terminal mouth with barbels S. dumeril

4. Other Characteristics Dermal denticles in Squatina guggenheim Large Labial Cartilages, Conical, pointed teeth Ex. Squatina californica

5. Distribution of genus Squatina Found worldwide on continental shelves Subtropical-warm temperate seas Found from 0-500 m depth, bottom dwelling

6. Wide jaws produce large suction, Pointed teeth grip prey Feeding Morphology

7. Feeding Behavior http://youtube.com/ watch?v=m2eX14h wTTk Prey: Teleost fishes Cephalopods Crustaceans Smaller Elasmobranchs, e.g. (Horn Shark, Heterodontus francisci) Feed on benthic and near- bottom organisms Ambush predator Rely on camouflage

8. Locomotion and camouflaging behavior http://youtube.com/watch?v=CasWxx_OFs8

9. Phylogeny Source of debate Known from Upper Jurassic Morphologically placed in sister group with Squaliformes, Raijidae (Skates), Pristiophoridae (sawfishes) Molecular techniques indicate Pristiophoridae basal to Squaliformes Earlier fossils of Squatiniformes may indicate basal lineage Requires more study D. Squatina africana E. Pristiophorus cirratus