Note on Fertilizing Capacity of Spermatozoa Stored in Spermatangium: a Possible Extra Sperm Storage Site in the Japanese Common Squid Todarodes pacifions

摘要

Fertilizing capacity of spermatozoa in sper-matungium attached on female outer lip in the Japanese common squid Todarodes pacificus was examined by artificial insemination experiment. Similar to spermatozoa stored in female seminal receptacle in buccal membrane, which is fundamental sperm storage site in this squid, rate of fertilization for spermatozoa of spermatungium origin was around 90%. This indicates that spermatungium may function as an extra sperm storage site beside seminal receptacle.