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Development of the Cetacean Nasal Skull

Springer Berlin,
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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 results are in a


Titel: Development of the Cetacean Nasal Skull
Autoren/Herausgeber: Milan Klima
Aus der Reihe: Advances in Anatomy, Embryology and Cell Biology
Ausgabe: 1999

ISBN/EAN: 9783540649960

Seitenzahl: 144
Format: 23,5 x 15,5 cm
Produktform: Taschenbuch/Softcover
Gewicht: 510 g
Sprache: Englisch - Newsletter
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