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
Produktkennzeichnungen
ISBN-10
3540649964
ISBN-13
9783540649960
eBay Product ID (ePID)
61219416
Produkt Hauptmerkmale
Sprache
Englisch
Anzahl der Seiten
156 Seiten
Verlag
Springer Berlin Heidelberg, Springer Berlin
Publikationsname
Development of The Cetacean Nasal Skull
Autor
Milan Klima
Format
Taschenbuch
Erscheinungsjahr
1999
Zusätzliche Produkteigenschaften
Hörbuch
No
Inhaltsbeschreibung
Paperback
Item Length
23cm
Item Height
8mm
Item Width
15cm
Nummer Innerhalb der Serie
149
Buchreihe
Advances in Anatomy, Embryology And Cell Biology
Item Weight
248g
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