Fig. 31.2.

Wed, 2020-03-18 14:10 -- hwadmin
(A) Green turtle (Chelonia mydas) (photo: GBRMPA); (B) hawksbill turtle (Eretmochelys imbricata) (Photo: GBR MPA); (C) loggerhead sea turtle (Caretta caretta) digging a nest pit on Heron Island, Great Barrier Reef (Photo: H. Heatwole); (D) head of olive sea snake (Aipysurus laevis) showing the two semicircular nostril valves (closed) (Photo: V. Lukoschek); (E) various sea snake species in an aquarium illustrating the differences in size, shape and colour pattern within the group. On the left with saddle-blotches is Hydrophis stokesii and the banded sea snake is a different species of Hydrophis (note that the head is small and protruding above the water and the paddle-shaped tail is large and submerged). The three sea snakes on the right are Aipysurus laevis (note their marked differences in colour). Colour patterns vary greatly within many species, especially from one locality to another (Photo: H. Heatwole.); (F) two turtleheaded sea snakes, Emydocephalus annulatus, courting. The male is the smaller (dark) snake pursing the larger female. There is enormous colour pattern variation in both sexes of this species, ranging from entirely black (melanistic) to very pale salmon (Photo: M. Beger); (G) juvenile olive sea snake, Aipysurus laevis, showing strongly banded pattern of this species in its first year of life (Photo: V. Lukoschek); (H) Aipysurus duboisii swimming over a seagrass bed in sandy habitat adjacent to a coral reef (Photo: V. Lukoschek); (I) two turtleheaded sea snakes, Emydocephalus annulatus, courting. The male is the smaller snake on top of the larger female. (Photo: M. Carvolth); (J) adult olive sea snake, Aipysurus laevis, showing typical colour pattern (olive head and uniform grey to brown body) found on the Great Barrier Reef (Photo: V. Lukoschek); (K) Hydrophis stokesii, the bulkiest of all sea snake species, may reach 2 m in length and has a large head and an exceptionally wide gape. Its fangs are long and it is one of the few species capable of penetrating a wet suit (Photo: Australian Insistitute of Marine Science).
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