平疣桑椹石磺生殖系统结构及精子储存场所

雌雄同体贝类精子的储存和利用规律一直是国内外贝类生物学研究的难点之一,本文利用活体解剖、显微观察、组织切片和扫描电镜技术,综合研究了平疣桑椹石磺(Platevindex mortoni)的生殖系统及精子储存场所。结果显示,其生殖系统包括生殖器本部、雌性生殖部分和雄性生殖部分。生殖器本部由两性腺、两性输送管、蛋白腺、黏液腺、支囊组成;雌性生殖部分包括输卵管、受精囊、阴道,位于身体中后方体腔内;雄性生殖部分包括输精管、刺激器、阴茎、阴茎鞘和阴茎牵引肌,位于身体前端右侧体腔内;其阴茎有阴茎鞘,阴茎表面布满倒刺。平疣桑椹石磺阴茎为直线状,无雄性附属腺。未交配的性成熟个体支囊内充满细长精子,受精囊内无精子;而交配后充当雌性个体的支囊内均为细长的自体精子,受精囊内有大量活力较强的粗短精子,其支囊为自体精子的存储场所,而受精囊为异体精子的存储场所。其精子储运情况为:两性腺内精子成熟后暂存于支囊,交配时通过输精管运输至阴茎,由阴茎输送精子至对方的阴道,异体精子进入受精囊内存储待用。

Study on the reproductive system and sperm transport way of Platevindex mortoni

The reproductive system of Platevindex mortoni has been observed and studied in detail. The reproductive system is mainly composed of hermaphroditic gland, albumen gland, mucous gland, female reproductive system and male reproductive system. The female reproductive system was consisted of oviduct, spermatheca and vagina, and the male reproductive system was included vas deferens, seminal vesicle and penis. Compared with the reproductive system of Onchidium struma, find that they have some difference in the male reproductive system, the O. struma have a spiral penis with accessory penial gland while the Platevindex mortoni have a straight penis without any accessory gland. The anatomy of un-copulation individuals, find that their seminal vesicle were full of slender spermatozoa, while the spermatheca without any spermatozoa. The result shows that the mature own-spermatozoa were store in seminal vesicle. Anatomy of the copulationed individuals which act as a female role, their spermatheca were full of moving stubby spermatozoa, the result shows that the spermatheca were the place where donor- spermatozoa store. Vas deferens and male mating organ were observed in detail, and the transportation route of spermatozoa was also analyzed. The mature spermatozoa were transferred by hermaphrodite duct from hermaphroditic gland to seminal vesicle, then convey via vas deferens to penis, during the copulation, penis transport the spermatozoa to the vagina, finally enter spermatheca, when ova matured, transferred by oviduct to spermatheca, the sperm fertilized ova in the spermatheca.