BIOL 2030 Lecture Notes - Parapodium, Oligochaeta, Coelom

• School: York University
• Department: Biology
• Course: BIOL 2030
• Professor: Scott Kelly

Document Summary

Annelids phylum of segmented coelomate worms, commonly called ringed worms. They have a soft elongated body with a muscular body wall, divided into many similar segments, usually separated by septa, and covered with a thin, flexible collagenous cuticle. They possess a blood system, nephridia, and a central nervous system. The annelida contains three main classes: polychaeta (ragworms, lugworms), oligochaeta (e. g. earthworms) and hirudinea (leeches) Chlorocruorin green, haem-containing, oxygen-carrying protein found in the blood of certain polychaete worms. Clitellum swollen glandular portion of skin of certain annelids, such as earthworm, which secretes the cocoon in which an embryonic worm develops. Enteronephric with nephridia opening into gut (in oligochaetes) Metamerism body divided into a serial succession of segments. Metanephridia nephridial tubule with opening into the coelom. Nephridiopore external opening of excretory organs (nephridia) in invertebrates. Nephridia excretory organ having function of kidney in invertebrates. Nephrostome opening of nephridial tubule into body cavity.