pereon
Anterior portion of trunk with thoracopods, exclusive of maxillipedal somites and appendages. (Syn. paraeon, pereion) [McLaughlin, 1980].
Term referring to the free (unfused) thoracomeres posterior to the maxilliped-bearing thoracomeres in malacostracans [Brusca and Brusca, 2002].
That portion of the thorax not fused to the head (when such fusion occurs) [Brusca and Brusca, 2002].
Thoracic division of body, comprising six free pereonites (thoracomeres) and bearing uniramous appendages [Holdich and Jones, 1983].
Thoracic segments 2-8 bearing the locomotory appendages, or pereopods. (Thoracic segment 1 is part of the cephalon and bears the maxilliped.) [Wilson, 1989].
(Order Cumacea):
Division (tagma) of body between head (cephalon) and abdomen (pleon) or, more accurately, between cephalothorax and abdomen. Consists of five somites (pereonites), each bearing appendages (pereopods). Morphologically not equivalent to thorax (with a total of eight somites) because first three somites are fused to cephalon (i.e., cephalothorax) [Stachowitsch, 1992].
(Order Tanaidacea):
Division (tagma) of body between head and abdomen (pleon). Morphologically not equivalent to thorax (with a total of eight somites) because first thoracomere (bearing maxillipeds) is fused to head, the second being covered by and fused to carapace; accordingly, pereon can be considered to consist of seven or six segments (pereonites). (Syn. peraeon, pereion) [Stachowitsch, 1992].
(Order Amphipoda):
Division (tagma) of body between head (cephalon) and abdomen (pleon) or more accurately between cephalothorax and abdomen. Consists of four to seven segments (pereonites), each bearing appendages (pereopods). Morphologically not equivalent to "thorax" because first (and occasionally second) thoracic segment (bearing maxilliped) is fused to cephalon. (Syn. peraeon, pereion, mesosome) [Stachowitsch, 1992].
(Order Isopoda):
Middle or thoracic region of the body, consisting of seven segments or pereonites, first fused with cephalon in isopods [Kensley and Schotte, 1989].
(Order Isopoda):
Second and largest division (tagma) of body between head (cephalon) and abdomen (pleon) or more accurately between cephalothorax and pleon. Typically consists of seven segments (pereonites); morphologically not equivalent to thorax because first (and occasionally second) thoracic segment (bearing maxillipeds) is fused to cephalon. (Syn. peraeon, pereion) [Stachowitsch, 1992].
(Order Isopoda):
Those thoracic segments not fused to the cephalon [Wetzer et al. 1997].
(Order Mysida):
Term occasionally applied to that part of thorax not fused with head, i.e., second (or third) through eighth thoracomeres. (Syn. peraeon) [Stachowitsch, 1992].
(Subclass Branchiura):
Region of body comprising three free thoracic somites (the first thoracomere being fused to head) [Stachowitsch, 1992].
(Order Thermosbaenacea):
In one interpretation of main body regions, division between cephalon (head + first thoracic somite) and abdomen. Accordingly, pereon consists of seven somites (pereonites), their appendages being termed pereopods. (Syn. pereaon, pereion) [Stachowitsch, 1992].

Crustacea glossary. . 2011.

Look at other dictionaries:

  • Péréon — Le terme de péréon désigne la partie entre le céphalon et le telson portant les appendices natatoires ou ambulatoires. © Anatomie d un trilobite …   Wikipédia en Français

  • pereon — or pereion noun Etymology: New Latin, from Greek peraiōn, present participle of peraioun to transport, from peraios situated beyond, from pera beyond; akin to Greek poros passage more at fare Date: 1855 the thorax or the seven metameres… …   New Collegiate Dictionary

  • pereon — n. [Gr. peraioun, to convey] 1. (ARTHROPODA: Crustacea) A thoracic region of Isopoda; anterior portion of the trunk bearing thoracopods, except for maxillipedal somites and appendages. 2. pereion (ARTHROPODA: Insecta) see prothorax; pereonal adj …   Dictionary of invertebrate zoology

  • pereon — pe·re·on …   English syllables

  • pereon — noun see pereion …   Useful english dictionary

  • pereonite — A segment of the pereon. (Syn. pereomere) [Brusca and Brusca, 2002]. Somite belonging to the pereon [Holdich and Jones, 1983]. Somite of pereon. (Syn. paraeonite, pereionite) [McLaughlin, 1980]. (Order Cumacea): One of five segments (somites) of… …   Crustacea glossary

  • pereopod — See: pereiopod [Martin, 2005]. An appendage of the pereon [Brusca and Brusca, 2002]. Non maxilliped thoracic limbs; five pairs in Decapoda (thoracopods 4 8) and three pairs in Stomatopoda (thoracopods 6 8); includes one pair of chelipeds and four …   Crustacea glossary

  • thorax — Anteriormost division of the crustacean trunk [Brusca and Brusca, 2002]. Middle body region of eight somites bearing maxillipeds and pereopods [Poore, 2004]. see Cephalothorax [Butler, T.H.]. Tagma between cephalon and abdomen comprising anterior …   Crustacea glossary

  • cephalon — A term that refers to the head of a crustacean [Brusca and Brusca, 2002]. Anterior region of the body bearing the antennules, antennae, eyes, mandibles, maxillules, and maxillae [Holdich and Jones, 1983]. Anteriormost tagma, bearing eyes, mouth,… …   Crustacea glossary

  • ovary — Female reproductive organ, producing ova [Butler, T.H.]. In free living copepod unpaired, parasitic copepod paired, expanded section of female reproductive system in which eggs are produced. Located dorsally, above midgut, near border of head and …   Crustacea glossary

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