By Prof. Dr. M. Klima (auth.)
Morphogeny of the nasal cranium used to be investigated in ninety two embryos of thirteen species of Cetacea. in comparison to the unique nasal tablet of land mammals, the nasal buildings of Cetacea convey many weighty modifications. for this reason, the nostrils are translocated from the top of the snout to the vertex of the pinnacle. numerous buildings of the embryonic nasal cranium stay preserved even in grownup cetaceans. The translocation of the nostrils to the top element of the surfacing physique is one of the such a lot ideal variations of cetaceans to the aquatic lifestyles conduct. The morphogeny of the nasal cranium means that all cetaceans are of universal starting place and shape a unmarried monophyletic order. The hitherto traditional department of this order into suborders, Mysticeti and Odontoceti, seems to be unsubstantiated. particularly, no less than 3 heavily similar superfamilies can be unique in the order Cetacea, viz., Balaenopteroidea, Physeteroidea, and Delphinoidea. the consequences are in a conspicuous accordance with the latest molecular organic investigations in this topic.
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Extra info for Development of the Cetacean Nasal Skull
41 let Fig. 23. Megaptera novaeangliae embryo, 107 mm T1. Dorsal view of the cartilaginous structures of the embryonic nasal skull Fig. 24. Megaptera novaeangliae embryo, 107 mm T1. Lateral view of the cartilaginous structures of the embryonic nasal skull 42 Fig. 25. Megaptera novaeangliae embryo, 107 mm TL. The right nasal cavity viewed from the inside. The arrows indicate the section planes in Fig. 26a,b. Megaptera novaeangliae embryo, 107 mm TL. The right nasal cavity shown in cross sections.
The homology of the displaced and transformed cartilaginous structures with those of the initial nasal skull of terrestrial mammals is also confirmed by their connection with certain desmal elements. At these medium-sized stages the anlagen of the desmal skull bones are already well developed and they join the cartilaginous structures laterally. At the same time, the firm connections between the praemaxillare and the lamina transversalis anterior, between the vomer and the cartilago paraseptalis and the processus paraseptalis posterior are preserved, the same as is the case with the initial nasal skull of terrestrial mammals.
16 a-f. Physeter catodon. Lateral and dorsal views of the cartilaginous structures of the embryonic nasal skull. Size of the embryos in mm TL: a-c 97; d-f 150 32 Fig. 17. Physeter catodon embryo, 102 mm TL. Lateral view of the cartilaginous structures of the embryonic nasal skull 33 Fig. 18. Physeter catodon embryo. 150 mm TL. Frontal view of the cartilaginous structures of the embryonic nasal skull developmental stages. The medial part of the paries nasi shows a typical inside furling of its outer edge, corresponding to the maxilloturbinale.