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Scyliorhinidae (catshark; subclass Elasmobranchii, order Lamniformes) A family of marine sharks that have slender bodies and the first of the two dorsal fins usually situated over or behind the pelvic fins. There is no nictitating membrane or oro-nasal groove. The anal fin is present. Catsharks tend to be bottom-dwelling and slow-moving, feeding on small animals. Their eggs are enclosed in horny capsules which are often attached to seaweed. There are about 58 species, distributed world-wide in temperate to tropical seas.