ISSN:
1432-0878
Keywords:
Pomatoceros triqueter
;
Egg investments
;
Fertilization reaction
;
Ultrastructure
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary The ultrastructure of unfertilized and fertilized egg investments ofPomatoceros triqueter is described. A characteristic feature is the presence of a hitherto unrecorded additional investment layer, inserted between the chorion and the “outer border layer”, which is referred to as the intermediate layer. The fertilization reaction consists of the release of cortical granule material into the perivitelline “space”, and the severing of the microvillous cytosome to “outer border layer” connections, thus allowing an increase in the width of the perivitelline “space”. More ridged corrugations are found on the outer surface of the investments in the fertilized as compared with the unfertilized condition.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00968546
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