The clitellum is a thick, saddle-like ring found in the epidermis (skin) of the worm, usually with a light-colored pigment. To form a cocoon for its eggs, the clitellum secretes a viscous fluid. [1] This organ is used in sexual reproduction of some annelids, such as leeches.

The Clitellata are a class of annelid worms, characterized by having a clitellum – the 'collar' that forms a reproductive cocoon during part of their life cycles. The clitellates comprise around 8,000 species. Unlike the class of Polychaeta, they do not have …

In animal reproductive system: Annelids and mollusks. Sexually mature oligochaetes have a clitellum, which is a modification of a section of the body wall consisting of a glandular, saddlelike thickening near the gonopores. During copulation, the clitellum secretes a mucus that keeps the worms paired while sperm are being exchanged.

2010年1月1日 · The clitellum is a single layer thick, is limited to the genital regions in microdriles, and the eggs are large and yolky. In earthworms, secretions from the multilayered clitellum provide an alternative source of food for the eggs, which are small and less yolky.

A clitellum is a modification of the epidermis, which develops as an easily visible, glandular girdle partly behind the female pores; it secretes a cocoon in which eggs are laid. Parapodia are paired, unjointed lateral appendages found in polychaete worms, which are often fleshy (especially in marine polychaetes) and used for locomotion ...

Annelids are often called “segmented worms” because they possess true segmentation of their bodies, with both internal and external morphological features repeated in each body segment. The clitellum is a structure on the anterior portion of the worm that generates mucus to aid in sperm transfer from one worm to another; it also forms a ...

2024年12月26日 · All sexually mature oligochaetes have a clitellum (a glandular structure derived from the epithelium), which secretes the egg capsule; it may be saddle-shaped or ring-shaped. In lower oligochaetes it consists of a single layer of modified epithelial cells; in higher forms, such as earthworms, it may have many layers.

2024年10月2日 · Clitellum and Reproductive System: The clitellum, a glandular structure, is present in oligochaetes and plays a crucial role in reproduction. It secretes mucus to form a cocoon during copulation, facilitating external fertilization. This structure is also involved in producing a protective covering for the eggs.

2012年1月1日 · The taxonomic identification of oligochaetes (clitellate annelids) mainly relies on internal organs due to the simplicity of their external anatomy. This fact, added to the small size of most of...

Annelids and Arthropods united by segmentation . Phylum Annelida. General characteristics and synapomorphies; The coelom as a hydrostatic skeleton; Segmentation and metamerism; 3 classes: Polychaeta, Oligochaeta, Hirudinea; Locomotion; Feeding; Reproduction; Why be a worm? The Annelid Bauplan. General characteristics; Segmented, Metameric