Abstract：
:Ethmoturbinates, nasoturbinates, and maxilloturbinates are well developed in the narial tract of land-dwelling artiodactyls ancestral to whales, but these are greatly reduced or lost entirely in modern whales. Aegyptocetus tarfa is a semiaquatic protocetid from the middle Eocene of Egypt. Computed axial tomography scans of the skull show that A. tarfa retained all three sets of turbinates like a land mammal. It is intermediate between terrestrial artiodactyls and aquatic whales in reduction of the turbinates. Ethmoturbinates in A. tarfa have 26% of the surface area expected for an artiodactyl. These have an olfactory function and indicate that early whales retained a sense of smell in the transition from land to sea. Maxilloturbinates in A. tarfa have 6% of the surface area expected for an artiodactyl. These have a respiratory function and their markedly reduced size suggests that rapid inhalation and exhalation was already more important than warming and humidifying air, in contrast to extant land mammals. Finally, the maxilloturbinates of A. tarfa, although greatly reduced, still show some degree of similarity to those of artiodactyls, supporting the phylogenetic affinity of cetaceans and artiodactyls based on morphological and molecular evidence.
journal_name
J Anatjournal_title
Journal of anatomyauthors
Peri E,Gingerich PD,Aringhieri G,Bianucci Gdoi
10.1111/joa.13088subject
Has Abstractpub_date
2020-01-01 00:00:00pages
98-104issue
1eissn
0021-8782issn
1469-7580journal_volume
236pub_type
杂志文章abstract：:We present a simple and quick system for accurately scoring the developmental progress of mouse embryos harvested on embryonic day 14 (E14.5). Based solely on the external appearance of the maturing forelimb, we provide a convenient way to distinguish six developmental sub-stages. Using a variety of objective morphome...
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journal_title：Journal of anatomy
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journal_title：Journal of anatomy
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journal_title：Journal of anatomy
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journal_title：Journal of anatomy
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journal_title：Journal of anatomy
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doi：
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journal_title：Journal of anatomy
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doi：
更新日期：1994-12-01 00:00:00
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journal_title：Journal of anatomy
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journal_title：Journal of anatomy
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journal_title：Journal of anatomy
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更新日期：1996-12-01 00:00:00
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journal_title：Journal of anatomy
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journal_title：Journal of anatomy
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journal_title：Journal of anatomy
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journal_title：Journal of anatomy
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journal_title：Journal of anatomy
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journal_title：Journal of anatomy
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