anal somite

anal somite
Postsegmental plate or lobe bearing anus [Brusca and Brusca, 2002].
(Order Leptostraca):
Telson. (Syn. anal segment) [Stachowitsch, 1992].
(Subclass Copepoda):
Last (fifth) segment of abdomen; bears anus dorsally and pair of caudal rami posteriorly. Occasionally termed telson [Stachowitsch, 1992].
(Subclass Copepoda):
The posterior somite and abdominal somite onto which the anus opens. The anal somite bears a paired appendage called the caudal rami. The anal somite is considered the first abdominal somite, despite its posterior position, because it is the first abdominal somite to appear during post-embryonic development [Ferrari and Dahms, in press].
(Subclass Mystacocarida):
Telson [Stachowitsch, 1992].

Crustacea glossary. . 2011.

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  • somite — A body segment, especially of the abdomen [Chace and Hobbs, 1969]. Body segment, as in abdominal somites 1 6 [Poore, 2004]. Body segment, especially of the abdomen [Butler, T.H.]. Division of body (head, thorax, abdomen) with exoskeleton… …   Crustacea glossary

  • anal segment — (Order Diplostraca): Telson. (Syn. anal somite) [Stachowitsch, 1992]. (Order Anostraca): Telson. (Syn. anal somite) [Stachowitsch, 1992]. (Class Cephalocarida): Telson. (Syn. anal somite) [Stachowitsch, 1992]. (Class Remipedia): Posteriormost… …   Crustacea glossary

  • anal operculum — (Subclass Copepoda): A small median process on dorsal surface of the anal somite protecting the anus [Boxshall and Halsey, 2004]. (Subclass Copepoda): Lid like structure covering anus. (smooth, toothed) [Stachowitsch, 1992] …   Crustacea glossary

  • telson — ( ) [Baba, 2005]. Entire animal, right appendages omitted, dorsal view, based on Munida. [Baba, 2005] Last somite of body, bearing arms and commonly caudal furca or pair of cerci, growth zone for postcephalic somites located at its anterior edge …   Crustacea glossary

  • uropod — A paired biramous appendage attached to the sixth abdominal somite in all but the true crabs and usually combining with the telson to form a tail fan [Chace and Hobbs, 1969]. An appendage of the last (6th) abdominal segment [Warner, 1977].… …   Crustacea glossary

  • caudal ramus — One of paired appendages constituting caudal furca, usually rodlike or bladelike, sometimes filamentous and multiarticular. (Syn. caudal filament, caudal style, cercus, cercopod, furcal ramus, stylet) [McLaughlin, 1980]. Single appendage of… …   Crustacea glossary

  • abdomen — Posterior part of body, of six segments or somites, sometimes including tailfan [Poore, 2004]. Region of the body posterior to cephalothorax, consisting of six body segments and telson (see Fig. 13) [Hobbs and Jass, 1988]. That part of the body… …   Crustacea glossary

  • anus — (Order Cladocera): Posterior opening of digestive tract at end of postabdomen. (terminal, on dorsal margin) [Stachowitsch, 1992]. (Order Notostraca): Posterior opening of digestive tract at end of telson; located between caudal rami and may be… …   Crustacea glossary

  • pleomere — See: abdominal somite [Martin, 2005]. See: abdominal somite [McLaughlin, 1980]. (Order Tanaidacea): One of six segments (somites) of abdomen (pleon). Last (sixth) or last two (fifth and sixth) pleomeres fused to telson to form pleotelson. First… …   Crustacea glossary

  • Caudal ramus — The caudal ramus (caudal rami) is a characteristic feature of primitive Crustaceans. Located on the anal somite (telson segment), the caudal ramus s a pair of appendage like or spine like protrusions. Specific structures which are rod or blade… …   Wikipedia

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