Okuyama Makiko, Saito Yasunori
Shimoda Marine Research Center, University of Tsukuba, Shizuoka, Japan.
Zoolog Sci. 2002 Jul;19(7):809-15. doi: 10.2108/zsj.19.809.
Morphology and life history of a new species of the genus Botryllus belonging to the family Botryllidae were described in detail. This ascidian was collected from the stony shore in the vicinity of Shimoda (Shizuoka prefecture, Japan). The arrangement of ovary and testis in this ascidian was the same as that in other species of the genus Botryllus, while the embryo developed in a brood pouch formed from the invagination of peribranchial epithelium, as in the other genus Botrylloides. The processes and features of the allorecognition reaction of this ascidian were observed. The reaction showed the same processes as that in the species of the genus Botrylloides. Therefore, this ascidian has both features of the two genera of the family Botryllidae, which strongly suggests the necessity of reconsidering on the classificatory criteria of botryllid ascidians.
详细描述了葡萄海鞘科葡萄海鞘属一个新物种的形态学和生活史。这种海鞘采自日本静冈县下田附近的石质海岸。该海鞘的卵巢和精巢排列方式与葡萄海鞘属其他物种相同，而胚胎在由鳃周上皮内陷形成的育儿袋中发育，这一点与其他拟葡萄海鞘属物种相同。观察了该海鞘异体识别反应的过程和特征。该反应显示出与拟葡萄海鞘属物种相同的过程。因此，这种海鞘具有葡萄海鞘科两个属的特征，这有力地表明有必要重新考虑葡萄海鞘类海鞘的分类标准。
