By John E. Reynolds III;Sentiel A. Rommel
Booklet by means of John E. Reynolds III, Sentiel A. Rommel
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Extra info for Biology of Marine Mammals
Among the most unusual anatomical features observed among cetaceans is the tusk (which can exceed 3 m in length) of the narwhal (Monodon monoceros). The odontocetes with which most people are familiar include members of the family Delphinidae (Table 1-7). Included in the group are such animals as killer whales (Orcinus orca) and bottlenose dolphins (Tursiops truncatus). , are also called dolphins. Delphinids are medium-sized whales that have conical teeth (see Fig. 1-7), and generally possess a beak and a large falcate dorsal fin located about midway along the back.
Mead, pers. ). If we did include the bats, we would need to add the mammalian order Chiroptera to the group we call marine mammals, an addition with which many marine mammal scientists would disagree. , that they have large body size and are well insulated). A very different example relates to religious beliefs; marine biologists consider dolphins to be marine mammals and yet Buddhist fishermen in Sri Lanka have, until recently, considered them fish and harvested them for food. Order Carnivora Five families of carnivorous mammals have marine representatives.
Additional diagnostic features of the rorquals include the presence of numerous ventral pleats (called throat grooves) that may extend from the cranial margin of the lower jaw to the umbilicus, relatively short baleen, dorsal fins, and a jaw line with virtually no arch. Table 1-7. Species and Common Names for Members of the Family Delphinidae in the Suborder Odontoceti, the Toothed Whales Species Common Name Cephalorhynchus commersonii Commerson’s dolphin C. eutropia Black dolphin C. heavisidii Heaviside’s dolphin C.
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