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