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The dolphins (two species are known) are moderately slender and flattened sidewise, with slightly projecting lower jaw, a massive blunt head, a long, rather high dorsal fin without spines, extending from close behind the head to near the base of the caudal fin, an anal similar to the dorsal in shape but shorter, and a widely forked tail. They have small comb-like teeth in the jaws and on the roof of the mouth.