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Comparative Study
. 1978 Jul 13;191(1):27-37.
doi: 10.1007/BF00223213.

The spermatozoon of Oikopleura dioica Fol (Larvacea, Tunicata)

P R Flood, B A Afzelius
Comparative Study

The spermatozoon of Oikopleura dioica Fol (Larvacea, Tunicata)

P R Flood et al. Cell Tissue Res. .

Abstract

The spermatozoon of Oikopleura dioica is about 30 micron long, with a spherical head, about 1 micron wide, a 3 micron long and 1 micron wide midpiece, and a 25 micron long tail with a tapered end piece. The head contains a nucleus with the chromatin volume limited to about 0.1 micron3. A small acrosome is found in an anterior inpocketing, and a flagellar basal body in a posterior inpocketing of the nucleus. The midpiece contains a single mitochondrion with the flagellar axoneme embedded in a grove along its medial surface. The flagellar axoneme has the typical 9 + 2 substructure, and the basal body the typical 9 + 0 substructure. A second centriole and special anchoring fibres are absent.

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