compare polychaetes and oligochaetes

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