clitellum(saddle)
基础科学

        A glandular and vascularswelling of the epidermis of some Annelida(earthworms and leeches),involved in re-production. In the earthworm,it occurs oversegments 32 to 37 and forms the site of at-tachment for segments 9 to 15 of a mate atcopulation. It secret......（本文共 452 字）     [阅读本文] >>