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compare polychaetes and oligochaetes

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