Flood P R, Afzelius B A
Cell Tissue Res. 1978 Jul 13;191(1):27-37. doi: 10.1007/BF00223213.
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.
双尾海鞘的精子约30微米长，头部呈球形，宽约1微米，中段长3微米、宽1微米，尾部25微米长，末端逐渐变细。头部有一个细胞核，染色质体积约为0.1立方微米。在细胞核前部的内陷处有一个小顶体，后部内陷处有一个鞭毛基体。中段有一个单一的线粒体，鞭毛轴丝沿其内表面嵌入一个凹槽中。鞭毛轴丝具有典型的9+2亚结构，基体具有典型的9+0亚结构。没有第二个中心粒和特殊的锚定纤维。
