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