The phyla Mollusca and Annelida belong to a clade called the Lophotrochozoa , which also … Newest View of Annelid Taxonomy-All annelids are polychaetes; polychaete = essentially synonymous with the entire Phylum Annelida. -Then Polychaetes vs. Clitellates (Oligochaetes & Hirudinea)-Now, everything is a polychaete, and polychaetes are divided into errant vs. sedentary. Oligochaeta: freshwater, marine, and terrestrial segmented worms such as earthworms, reduced head, no parapodia, chaetae present. PHYLUM Annelida CLASS Oligochaeta N C Note longitudinal & circular muscles, nephridium (N), and the coelom (C). What is a crop? [fig 6.8] well developed head, each segment usually has parapapodia with chaetae, tube-dawelling and free moving. Most polychaetes and oligochaetes also use similar mechanisms to regenerate after suffering damage. Remember, polychaete worms ... CLASS Oligochaeta Dorsal blood vessel Typhlosole Coelom. Polychaete locomotion. Polychaete: mostly marine segmented worms. Polychaete locomotion. 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 … well developed head, each segment usually has parapapodia with chaetae, tube-dawelling and free moving. Phylum Annelida By: Arnaiz, Martin Jr. A 2. The class Oligochaeta has over three thousand species. This group belongs to the class Clitellata and the phylum Annelida . Annelids are the most complex animals that can regenerate after such severe damage. Two polychaete genera, Chaetopterus and Dodecaceria, can regenerate from a single segment, and others can regenerate even if their heads are removed. 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 . A few oligochaetes … Oligochaeta is a subclass of simple-looking but surprising complex animals. 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. Polychaete: mostly marine segmented worms. 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. Note esophageal caeca (EC) and muscular pharynx (MP). (Class Clitellata) Stores food. The annelids traditionally include the oligochaetes, which include the earthworms and leeches, the polychaetes, which are a marine group, and two other smaller classes. In a compare and contrast essay you compare and contrast the different aspects of a topic! Oligochaeta: freshwater, marine, and terrestrial segmented worms such as earthworms, reduced head, no parapodia, chaetae present. Polychaete dissection. Errant polychaetes Peristalsis (especially burrowing) They are found throughout the world in freshwater and terrestrial habitats. Phylum Annelida - Class Polychaeta, Class Oligochaeta, Class Hirudinea 1. What is a gizzard (Class Clitellata) Grinds up and digests food. septa circular/longitudinal muscles burrowing gas exchange through diffusion across body wall metanephridia. The number and size of chaetae are greatly diminished in Oligochaeta compared to the polychaetes (poly=many, chaetae = hairs). What are the similarities of Oligochaetes to Polychaetes? Greatly diminished in Oligochaeta compared to the Class Clitellata and the phylum Annelida Class Oligochaeta Dorsal blood vessel Coelom! 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