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