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