The number and size of chaetae are greatly diminished in Oligochaeta compared to the polychaetes (poly=many, chaetae = hairs). PHYLUM Annelida CLASS Oligochaeta N C Note longitudinal & circular muscles, nephridium (N), and the coelom (C). Oligochaeta: freshwater, marine, and terrestrial segmented worms such as earthworms, reduced head, no parapodia, chaetae present. Errant polychaetes; Peristalsis common (on surface but more commonly in burrowing; see discussion for Oligochaetes) Crawling Parapodia and setae engage the substrate; Parapodial muscles contract for power stroke. The phyla Mollusca and Annelida belong to a clade called the Lophotrochozoa , which also … What are the similarities of Oligochaetes to Polychaetes? well developed head, each segment usually has parapapodia with chaetae, tube-dawelling and free moving. Phylum Annelida By: Arnaiz, Martin Jr. A 2. Most polychaetes and oligochaetes also use similar mechanisms to regenerate after suffering damage. [fig 6.8] Most aquatic oligochaetes – being smaller than polychaetes – have no need of special additional respiratory organs. Class Oligochaeta (oligos, few + chaete, hair) structure , digestive system , reproduction and ither funstions are disscussed in this article . In a compare and contrast essay you compare and contrast the different aspects of a topic! Newest View of Annelid Taxonomy-All annelids are polychaetes; polychaete = essentially synonymous with the entire Phylum Annelida. The annelids traditionally include the oligochaetes, which include the earthworms and leeches, the polychaetes, which are a marine group, and two other smaller classes. What is a crop? Two polychaete genera, Chaetopterus and Dodecaceria, can regenerate from a single segment, and others can regenerate even if their heads are removed. The class Oligochaeta has over three thousand species. Errant polychaetes Peristalsis (especially burrowing) Annelids are the most complex animals that can regenerate after such severe damage. Remember, polychaete worms ... CLASS Oligochaeta Dorsal blood vessel Typhlosole Coelom. Phylum Annelida (segmented worms, bristle worms) 15,000 species large successful phylum in water & on land -include earthworms, sand worms, bristle worms, clam worms, fan worms, leeches worldwide distribution: marine, brackish, freshwater and terrestrial … This group belongs to the class Clitellata and the phylum Annelida . Oligochaeta is a subclass of simple-looking but surprising complex animals. Phylum Annelida - Class Polychaeta, Class Oligochaeta, Class Hirudinea 1. well developed head, each segment usually has parapapodia with chaetae, tube-dawelling and free moving. A few oligochaetes … Polychaete dissection. Polychaete locomotion. Polychaete: mostly marine segmented worms. They are found throughout the world in freshwater and terrestrial habitats. Polychaete: mostly marine segmented worms. Oligochaeta: freshwater, marine, and terrestrial segmented worms such as earthworms, reduced head, no parapodia, chaetae present. septa circular/longitudinal muscles burrowing gas exchange through diffusion across body wall metanephridia. The many chetae of polychaetes are also arranged within fleshy, flat, paired appendages that protrude from each segment called parapodia , which may be specialized for different functions in the polychates. Note esophageal caeca (EC) and muscular pharynx (MP). (Class Clitellata) Stores food. What is a gizzard (Class Clitellata) Grinds up and digests food. Polychaete locomotion. -Then Polychaetes vs. Clitellates (Oligochaetes & Hirudinea)-Now, everything is a polychaete, and polychaetes are divided into errant vs. sedentary. 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