The Evolution of Man Volume 1
Excerpt: ...capable of being reduced to one common type of embryonic development; and this primitive type is most certainly exhibited to-day by the amphioxus. It must, therefore, be our next task to make a comparative study of the various forms of vertebrate gastrulation, and trace them backwards to that of the lancelet. Broadly speaking, they fall first into two groups: the older cyclostoma, the earliest fishes, most of the amphibia, and the viviparous mammals, have holoblastic ova-that is to say, ova with total, unequal segmentation; while the younger cyclostoma, most of the fishes, the cephalopods, reptiles, birds, and monotremes, have mer…
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- ISBN: 978-1-153-70195-2
- EAN: 9781153701952
- Produktnummer: 2697752
- Verlag: Books LLC, Reference Series
- Sprache: Englisch
- Erscheinungsjahr: 2013
- Seitenangabe: 104 S.
- Masse: H24.6 cm x B18.9 cm x D0.5 cm 272 g
- Abbildungen: Paperback
- Gewicht: 272
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