WebClitellum functions during reproduction and secretes the fluids needed for the sperm to swim between organisms; it then forms the hard cocoon in which the zygotes are placed and protects them until juveniles hatch Compare and contrast the phenomenon of epitoky among polychaetes with the life cycle of marine hydrozoans. WebClitellum: A swollen glandular region or saddle of epidermal tissue in the area of the gonopores that secretes material to form cocoons. From: Thorp and Covich's Freshwater …
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WebExternal Anatomy of Earthworm: The body of Pheretima is nearly circular in cross-section and varies from 7 to 8 inches (18-19 cms) in length. The general colour of the body is brown but the dorsal surface is darker. A dark line extends from end to end in the mid-dorsal line. The anterior end of the body is pointed and the posterior end is blunt. Web8 Feb 2024 · The band of slime is wriggled off the head of the worm and forms a cocoon in the shape of a lemon for the anywhere from four to 20 worm eggs that the common European earthworm typically lays. In about … countifs index 組み合わせ
Clitellum - an overview ScienceDirect Topics
Web29 Aug 2024 · The clitellum is a thickened glandular and non-segmented section of the body wall near the head in earthworms and leeches, that secretes a viscid sac in which the … Web22 Mar 2010 · What does the clitellum do in an earthworm? The clitellum is a series of segments that are swollen to form a saddlelike structure in the anterior portion of the oligochaete. The function of the ... WebThey belong to the Class Clitellata (along with earthworms, Subclass Oligochaeta) because of the presence of a clitellum, which is a swelling towards the head of the animal, where the gonads are located. However, unlike the oligochaetes, leeches do not show the clitellum all year. Instead, it only becomes visible during the breeding season. countifs in excel 2016