Abstract:
:Eggs of Xenopoecilus sarasinorum possess two distinct types of filaments on the surface of the egg envelope (chorion), long, attaching filaments restricted to the vegetal pole and weak, nonattaching filaments around the animal pole (micropyle). Both types are formed during oogenesis. After mature eggs were spawned through the urogenital pore, they were fertilized and hung in an abdominal concavity of the female. Oviposition never took place in the presence of embryos in the concavity because of the retardation of oogenesis. The loosely tangled tips of the attaching filaments that are retained within the ovarian cavity plug the urogenital pore by forming a hard complex with the epithelial cells. Into this plug structure that fuses with the inner wall of the urogenital pore, capillaries are provided. Within 5 days after the initiation of hatching, this plug degenerates and is released from the urogenital pore. Thus, in female X. sarasinorum, the reproductive cycle seems to be regulated by the physiological function ofthe plug structure formed by the attaching filaments in response to the presence of developing embryos.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Iwamatsu T,Kobayashi H,Sato M,Yamashita Mdoi
10.1002/jmor.10620subject
Has Abstractpub_date
2008-06-01 00:00:00pages
745-50issue
6eissn
0362-2525issn
1097-4687journal_volume
269pub_type
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