瘤背石磺的形态、习性和生殖行为

Morphological Characteristics, Living Habitus and Reproductive Behavior of Onchidium struma

20 0 3年 5月～ 2 0 0 4年 5月研究了上海崇明瘤背石磺 (Onchidiumstruma)的形态特征、生活习性 ,分别对其消化、呼吸、循环、排泄、生殖、神经等六大系统进行了阐述。结果表明 ,瘤背石磺生活在潮间带高潮区滩涂的芦苇丛里 ,摄食泥滩上的有机质和单胞藻类 ;雌雄同体、异体交配、卵生。生殖系统包括生殖器和雌、雄交接器三部分 :生殖器由两性腺、卵黄腺和蛋白腺组成 ;雄性交接器由输精管、附性腺、阴茎、刺激器等组成 ,雄性生殖孔位于右侧第一触角中部 ;雌性交接器由输卵管、受精囊、阴道等组成 ,雌性生殖孔位于肛门右侧约 5 0mm处的腹足与外套膜的交界处。本文并详细描述了石磺的交配行为。

The present paper analyzed the morphological characteristics and living habitus, including digestive system, respiratory system, circulatory system, excretory system, neural system, and reproductive system, of Onchidium struma based on the study conducted in Chongming island, Shanghai, from May 2003 to May 2004. The results show that: O.struma lives reedy beaches at high tide area of intertidal zone, and graze the organic rags in soil and unicellular algae as their food on silt beaches. O. struma is a kind of protandric hermaphrodite pulmonate, reproducing by means of allogamy and oviparity. Reproductive system consists of genital organs, male and female mating organs: Genital organs are composed of digenetic gland, vitelline gland, albumen gland; The male mating organs are composed of sperm-duct, accessory gonad, penis and stimulator with male gonopore on the middle of the right anterior tentacle; Female mating organs are composed of oviduct, spermatheca, vagina with female gonopore on the right 5.0?mm of anus at the border of foot and mantle. The mating behavior is also described in detail.