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Books > Science & Mathematics > Biology, life sciences > Zoology & animal sciences > Vertebrates > Mammals
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Development of the Cetacean Nasal Skull (Paperback, 1999 ed.)
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Development of the Cetacean Nasal Skull (Paperback, 1999 ed.)
Series: Advances in Anatomy, Embryology and Cell Biology, 149
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Morphogeny of the nasal skull was investigated in 92 embryos of 13
species of Cetacea. Compared to the original nasal capsule of land
mammals, the nasal structures of Cetacea show many weighty
transformations. As a result, the nostrils are translocated from
the tip of the snout to the vertex of the head. Several structures
of the embryonic nasal skull remain preserved even in adult
cetaceans. The translocation of the nostrils to the highest point
of the surfacing body is among the most perfect adaptations of
cetaceans to the aquatic life habits. The morphogeny of the nasal
skull suggests that all cetaceans are of common origin and form a
single monophyletic order. The hitherto usual division of this
order into two suborders, Mysticeti and Odontoceti, appears to be
unsubstantiated. Rather, at least three closely related
superfamilies should be distinguished within the order Cetacea,
viz., Balaenopteroidea, Physeteroidea, and Delphinoidea. The
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