スイショウガイ科 2 種の二型精子の微細構造

概要

論文の詳細を見る
The mature dimorphic spermatozoa of Conomurex luhuanus and Lambis lambis were examined with the electron microscope. The thread-like typical spermatozoa have the head consisting of a conical acrosome and a columnshaped nucleus. The axoneme arises from a distal centriole located in the posterior invagination of the nucleus. The middle piece has seven to nine mitochondria helically arranged around the axoneme. The cytoplasmic sheath of the tail contains many glycogen granules. Thus, the typical spermatozoa of the Strombidae have nearly the same basic ultrastructure as those in other families of the Mesogastropoda and Neogastropoda. The atypical spermatozoa are spindle-shaped and measure about 90-110μm in length and 10-15μm in maximum width, having a pair of undulating membranes running along lateral sides. The undulating membrane contains about 70-100 axonemes running in parallel with one another, and the basal body of each axoneme has the rootlet. Many mitochondria are contained near the undulating membrane especially at the anterior portion. Many granules of 1-5μm in diameter which are limited by the plasma membrane are also contained, but no nucleus. Thus, the atypical spermatozoa of the Strombidae have some peculiar structures such as a pair of undulating membranes consisting of many axonemes and the rootlet of the basal body.
日本貝類学会の論文
1980-02-29