Oligochaeta: The Oligochaeta are generally more diverse and abundant compared to the Polychaeta and Hirudinea and are common to a wide variety of habitats, ranging from pools to riffles. They are 3 class of Annelid worms.. pls help me find few differences between them.. thx ^^ Answer Save. 7. Subclasses of Ciltellates are Oligochaetes, and Hirudinea. Polychaeta, Clitellata, and Echiura. Many bristles, mostly marine, well-developed parapodia, eyes (in freeliving species), tentacles. leechs have no .. parapodia, setae, head extensions. Hirudinea are leeches. oligochaeta have NO parapodia, a SMALL number of setae, NO head extensions, and a clitellum. (1 cm–20 cm); most are under 2 in. 3 classes: Polychaeta, Oligochaeta, Hirudinea; Locomotion; Feeding; Reproduction; Why be a worm? what is the difference between polychaeta and oligochaeta? to 8 in. Phylum Annelida - Class Polychaeta, Class Oligochaeta, Class Hirudinea 1. Development direct (e.g., Oligochaeta or Hirudinea) or indirect (e.g., Polychaeta, Archiannelida). Polychaeta have parapodia, setae, a head extension, and no clitellum. Furthermore, polychaetes include bristle worms that are generally marine, while oligochaetes include earthworms that are aquatic and terrestrial. leech. 2 Subclasses of Class Clitellata. (5 cm) long. This class includes the 500 species of leeches, flattened, predacious or parasitic annelids equipped with suckers used for creeping. Habitat: They live in marine, freshwater and terrestrial environments. Favorite Answer. Larval stage when present is a trochophore. Oligochaeta and Hirudinea. Trend in Classification of Phylum Annelida: The classification of Phylum Annelida is still un­stable. The Annelid Bauplan. Anneldia, also called anneldids, are a phylum of worms, with about 22,000 living species. They are According to modern phylogenetic analyses, the Clitellata are considered to be a monophyletic clade embedded deep in the polychaetes.. But, oligochaetes have few bristles on their outer surface of the body but, no parapodia. Relevance. u.p. Oligochaeta Polychaeta Hirudinea. The main difference between polychaetes and oligochaetes is that the polychaetes have a pair of parapodia per body segment that bear many bristles. 18. In the phylum are two classes; Polychaetes, and Ciltellates. Phylum Annelida By: Arnaiz, Martin Jr. A 2. Characteristics of Free-Living Polychaetes. Most known among those species are earthworms, leeches, and ragworms. ... class Hirudinea also known as ? Cleavage spiral. what the differences between Polychaeta, Oligochaeta, and Hirudenia? Phylum Annelida of which there are three classes: Oligochaeta, Polychaeta, and Hirudinea. Characteristics of class Polychaeta. 3 Answers. 19. 17. Leeches range in length from about 1⁄2 in. 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