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