Evolution of the spermatozoon
作者:
Baccio Baccetti,
期刊:
Bolletino di zoologia
(Taylor Available online 1984)
卷期:
Volume 51,
issue 1-2
页码: 25-33
ISSN:0373-4137
年代: 1984
DOI:10.1080/11250008409439456
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
In the marine invertebrates which practise external fertilization, the spermatozoon is a flagellate cell, possessing an acrosomal complex made up of acrosome and perforatorium. In the animal phyla which adapted to the land after having achieved the internal fertilization, the spermatozoon acquires an elongate shape and develops accessory cytoskeletal organelles in the tail. In the highest forms, the flagellum seems to have become too long for a perfect motility; in such a condition, aberrant axonemal patterns can appear and aflagellate spermatozoa can also be found. At the apex of the terrestrial phyla, alternative motile apparatuses are achieved and also the acrosomal complex varies, according to the different structures of egg envelopes.
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