1. He was a world-renowned expert on coelenterates and elasmobranchs . 2. Species in the order consist of intestinal parasites of elasmobranch fishes. 3. They were found in coprolites ( fossilised faeces ) from an elasmobranch . 4. It also forms the embryonic skeleton and the skeleton of elasmobranch fishes. 5. In some elasmobranchs , only the right ovary develops fully. 6. Many surviving orders of elasmobranch date back to the Cretaceous, or earlier. 7. It is the first rigorous behvioural evidence for colour vision in any elasmobranch . 8. Elasmobranchs are ovoviparous, have relatively long gestation period s, and internal fertilization.9. This evolutionary development does not account for the gland in elasmobranchs , suggesting convergent evolution. 10. Extant elasmobranchs exhibit several archetypal jaw suspensions : amphistyly, orbitostyly, hyostyly, and euhyostyly.
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