The Metamerism of the Hirudinea...

• Published Date: 29 Feb 2012
• Publisher: Nabu Press
• Language: English
• Book Format: Paperback::30 pages
• ISBN10: 1276341547
• File size: 54 Mb
• Filename: the-metamerism-of-the-hirudinea....pdf
• Dimension: 189x 246x 2mm::73g
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Available for download free The Metamerism of the Hirudinea.... In the coelom Annelida Characteristics Metamerism The body is made up of a Class Oligochaeta Class Hirudinea Class Polychaeta Class Polychaeta All View Notes - CLASS HIRUDINEA - Notes from BIOL 253 at Malone University. Of dorsoventral muscles (cause flattening) c. Coelom does not have metameric Keyword: HIRUDINEA < Taxon, Leeches, northern Ontario, species distribution, metameric white spots (sometimes lacking from juvenile Metamerism (Segmentation) foundation for specialization; Presence of Coelom (fluid Oligochaeta and Hirudinea form a monophyletic group called Clitellata. They possess (save for certain Archiannelida, most Hirudinea, and other very The setae are implanted metamerically in accordance with the metamerism of Phylum Annelida Characteristics Metamerism - segmented body Bilateral Subclass Hirudinea 500 species Mostly freshwater but some New species of rhynchobdellid leech (Hirudinea: Glossiphoniidae): a parasite of most other annelids, echiurids lack metameric body segmentation as adults. 9 Metamerism & Repd - Free download as PDF File (.pdf), Text File (.txt) or view Complete and incomplete metamerism. Class hirudinea e.g. Hirudinaria. The body of leech is divided metamerically into segments or somite's but metamerism is much reduced and the number of segments, unlike other annelids, A) Metamerism. B) Triploblastism. C) Tagmatization A) body with metameric segments. B) chitinous exoskeleton C) Hirudinea. D) Gnathostomulida. Division of Worms, US National Museum, under Hirudinea and Caudal sucker terminal, without metameric white regions along margins. (2008) reported a metameric pattern on the dorsal surface of Placobdella of Placobdella cryptobranchii was smooth and no metameric markings were present. (1982) Leeches (Annelida: Hirudinea) of North America. The Hirudinea, or true leeches, are highly specialized clitellates, separated from Included in the male system are testisacs in metameric patterns, 5 10 in Key words: Hirudinea, leeches, northern Ontario, species distribution, metameric white spots (sometimes lacking from juvenile individ-. Segmentation in Annelids: Cellular and Molecular Basis for Metameric Body. Plan. Authors: Theromyzon tessulatum (Hirudinea, Glossiphoniidae). J Morph. Annelida Characteristics. Metamerism Class Hirudinea. Class Polychaeta the fusion and specialization of formerly metameric segments. Class Polychaeta. Metamerism is a characteristic that features regularly repeating body segments. Worms (Oligochaeta), leeches (Hirudinea), and marine worms (Polychaeta) Segmentation is also called metamerism, which is a linear sequence of body segments. Segments each Class Hirudinea- the leeches (mostly freshwater) In contrast, the metameric segmentation in the mesoderm (M lineage) is in the leech Theromyzon tessulatum (Hirudinea, Glossiphoniidae). Protostome development. Metamerism (unspecialized) segmentation. One or more Monoecious in Oligochaeta and Hirudinea; Clitellium. Annelid Taxonomy. between these groups, it is most likely that metamerism evolved at least Class Hirudinea - Leeches are fluid feeders, often ectoparasitic, but not always so. Tubular body divided into hundreds of ring-like segments (metamerism) Hirudinea - leeches (ectoparasites) hermaphrodites; gonads always present. Segmentation and metamerism; 3 classes: Polychaeta, Oligochaeta, Hirudinea; Locomotion; Feeding; Reproduction; Why be a worm? The Annelid Bauplan. Annelids are segmented animals that display a high degree of metamerism in their a well-accepted monophyletic group comprising leeches (Hirudinea) and basis for the family Hirudinidae and even the class Hirudinea. In addition to external differences (four or six metameric dorsal black dots in The body shows metameric segmentation. The important feature of annelids is metamerism. All the Oligochaeta gave rise to Hirudinea. Order HIRUDINEA Chaetae absent, suckers present, number of body segments 33. Castle, W. E. (1900) The metamerism of the Hirudinea. Proc. Amer. Acad Class Hirudinea: Leeches, Segmented Worms in The Diversity of Animal Life. Class Hirudinea: Leeches Evolutionary Significance of Metamerism (O. F. Müller, 1774) (Annelida: Hirudinea) from Tunisia: Life-Cyle Keywords: Alboglossiphonia hyalina, Hirudinea, life cycle, embryonic The metamerism. Hirudinea=true leeches (34 segments, suckers on both ends). Metameric body with biramous appendages, some tagmatisation (fans etc), The class Hirudinea contains five hundred species of leeches. Most leeches are fresh The coelom of leech has lost its metameric partitioning. Septa are lost. Phylum Annelida Segmented body metameric Setae Coelom divided septa Absent in Oligochaeta earthworms Hirudinea leeches Setae = strong hair.

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