Embryology of Dolphins

Staging and Ageing of Embryos and Fetuses of Some Cetaceans

By: Milan Klima, Oldrich Sterba, Bernd Schildger

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Paperback | 16 November 2000

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The rapid development of molecular biology and genetics has led to renewed interest in embryology, comparative embryology, and studies of the relations between ontogeny and phylogeny. In fact, genes have been identified which are involved in the formation of shapes and structures, and it is becoming apparent that their primary morphological expressions are conspicuously similar in different species. The primarily identical shapes do not become diversified until advanced individualization of embryos, and it is here that it is possible to employ the knowledge of comparative embryology, the branch of science engaged in the study of the development and differentiation of tridimensional structures in different animal groups. However, comparative embryology has been neglected during the past decades, as its development has appeared to have been completed. In our opinion, the decreased interest in comparative embryology has been caused by the fact that often the time factor was not or could not be respected. In fact, in the case of embryos of wild animals even their ontogenetic age and sometimes the duration of intrauterine development are unknown.

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Introduction	p. 1
Length and Weight of Adults, Life Span	p. 1
Length and Weight of Newborns, Ontogenetic Pattern	p. 3
Summary	p. 4
Duration of Intrauterine Development	p. 5
Mating and Calving Seasons	p. 6
Calving Intervals, Duration of Lactation	p. 7
Aims of this Study	p. 9
Material	p. 11
Methods	p. 19
Staging	p. 19
Ageing	p. 41
Results	p. 45
Developmental Stages in the Dolphin Species Under Study	p. 45
Stage 1: Primitive Streak	p. 45
Stage 2: First Somites (1-7)	p. 45
Stage 3: Four Branchial Bars, Anterior and Posterior Limb Buds, Tail Bud	p. 46
Stage 4: Eye Pigmented, Handplate Present	p. 47
Stage 5: Handplate Indented, Pinna Present	p. 56
Stage 6: Palate Fused, Ossification Begins	p. 62
Stage 7: Eyelids Fused, Umbilical Hernia Reposited	p. 67
Stage 8: Skin Folded	p. 74
Stage 9: Tactile Hairs Erupted	p. 80
Stage 12: Eyelids Open	p. 85
Stage 10: First Body Hairs Erupt on the Body	p. 86
Stage 11: Haircoat all over the Body	p. 87
Development of Body Shape and Fetal Growth	p. 88
Development of Head Shape and its Growth	p. 95
Development of the Thoracic Limb (Flipper)	p. 100
Development of Pelvic Limb Buds	p. 103
Development of the Fluke	p. 104
Development of the Dorsal Fin	p. 107
Duration of Intrauterine Development	p. 109
Mating and Calving Seasons	p. 113
Discussion	p. 123
Comparison of the Staging and Ageing Method with Other Methods	p. 123
Duration of Intrauterine Development and the Mating and Calving Seasons	p. 124
References	p. 127
Subject Index	p. 131
Table of Contents provided by Blackwell. All Rights Reserved.

Embryology of Dolphins

Staging and Ageing of Embryos and Fetuses of Some Cetaceans

At a Glance

Paperback

Shipping

How to return your order

Defective items

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