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 portion of trunk, last somite bearing most posterior genital pore or just anterior to this pore-bearing somite and nearly always limbbearing. (Syn. cormus (not precise equivalent of pereion)) [Moore and McCormick, 1969].

Tagma between cephalon and abdomen, i.e., anterior part of trunk [McLaughlin, 1980].

The anterior region of the trunk (body) [Brusca and Brusca, 2002].

The central region of a crustacean body: in Brachyura, the seventh to fourteenth segments which are always fused with the six head segments [Ingle, 1983].

(Order Cladocera):

Trunk [Stachowitsch, 1992].

(Order Notostraca):

Division (tagma) of body between head and abdomen. Consists of 11 segments ("thoracic segments" or body rings), each bearing pair of polyramous appendages (thoracopods). Covered, along with head, by carapace. (See also trunk) [Stachowitsch, 1992].

(Order Diplostraca):

Trunk [Stachowitsch, 1992].

(Order Anostraca):

Division (tagma) of body between head and abdomen. Typically consists of 11 somites (thoracomeres), each of which bears pair of biramous appendages (thoracopods). Ventral midline forms food groove. Thorax and abdomen together occasionally termed trunk [Stachowitsch, 1992].

(Class Cephalocarida):

Division (tagma) of body between head (cephalon) and abdomen. Consists of eight somites (thoracomeres), of which seven or eight bear biramous appendages (thoracopods). Thorax and abdomen together occasionally termed trunk [Stachowitsch, 1992].

(Order Cumacea):

Region of body comprising eight somites between head and abdomen. First three thoracic somites fused with head to form cephalothorax, with remaining thoracic somites collectively forming pereon [Stachowitsch, 1992].

(Order Tanaidacea):

Region of body comprising eight somites between head proper and abdomen (pleon). First thoracic somite (thoracomere) fused with head, with first and second thoracomeres being covered by and fused with carapace. See: pereon [Stachowitsch, 1992].

(Order Decapoda):

Posterior part of cephalothorax. Consists of eight somites (thoracomeres), each bearing pair of appendages (thoracopods). Covered, along with cephalon, by carapace [Stachowitsch, 1992].

(Order Amphipoda):

Region of body basically comprising eight somites between cephalon and pleon. First thoracic somite (and occasionally second) is fused with cephalon to form cephalothorax; remaining somites of thorax collectively form pereon [Stachowitsch, 1992].

(Order Isopoda):

Region of body basically comprising eight somites between head (cephalon) and abdomen (pleon). First thoracic somite (and occasionally second) is fused with cephalon to form cephalothorax; remaining somites of thorax collectively form pereon [Stachowitsch, 1992].

(Order Isopoda):

Tagma or body region between the cephalon and the abdomen [Kensley and Schotte, 1989].

(Order Mysida):

Major division (tagma) of body between head and abdomen. Consists of eight somites (thoracomeres) and is covered by carapace. (See also cephalothorax) [Stachowitsch, 1992].

(Order Stomatopoda):

Division (tagma) of body between head (cephalon) and abdomen (pleon); consists of eight somites (thoracomeres), each bearing pair of appendages (thoracopods). First four somites are covered by carapace [Stachowitsch, 1992].

(Order Leptostraca):

Division (tagma) of body between head (cephalon) and abdomen. Consists of eight somites (thoracomeres), each bearing pair of thoracopods. Covered, along with part of head and abdomen, by carapace [Stachowitsch, 1992].

(Subclass Branchiura):

Region of body between head (cephalon) and abdomen (pleon). First thoracic somite (thoracomere) is fused to head, the remaining three thoracomeres form pereon [Stachowitsch, 1992].

(Subclass Cirripedia):

() [Anderson, 1980].

^{Lepas anatifera: left valve removed. [Anderson, 1980]}

(Subclass Cirripedia):

Posterior of typically two basic divisions (tagmata) of body (head, thorax; in ascothoracican, head thorax, abdomen). Consists of six segments (somites) bearing appendages (cirri) [Stachowitsch, 1992].

(Subclass Copepoda):

That part of the body of a copepod posterior to the cephalic somite (bearing maxilla 2) and including the somite bearing the genital opening [Ferrari and Dahms, in press].

(Subclass Mystacocarida):

According to interpretation dividing body into cephalon, thorax, and abdomen, five-segmented tagma including maxilliped-bearing (maxillipedal) somite and following four thoracopod-bearing somites (thoracomeres) [Stachowitsch, 1992].

(Class Ostracoda):

Posterior of two major regions (head, thorax) of body; unsegmented and not clearly delimited from head. Typically bears two pairs of appendages (thoracopods) and is indistinguishably fused with rudimentary abdomen. Entirely enclosed in carapace [Stachowitsch, 1992].

(Class Ostracoda):

Second of three basic divisions of body (cephalon, thorax, abdomen). Consists of six somites (thoracomeres), of which at least the first is fused to head (to form cephalosome). Main flexure point of body may lie within thorax. (See also metasome, urosome) [Stachowitsch, 1992].

(Superorder Syncarida):

Major division (tagma) of body between head and abdomen. Basically consists of eight somites (thoracomeres), although in anaspidacean and stygocaridacean, first thoracomere (bearing maxillipeds) is fused with head [Stachowitsch, 1992].

(Order Thermosbaenacea):

Region (tagma) of body comprising eight somites between cephalon proper and abdomen. First thoracic somite (thoracomere) fused with cephalon. (See also pereon) [Stachowitsch, 1992].

(Order Euphausiacea):

Posterior part of cephalothorax. Consists of eight somites (thoracomeres), most bearing well-developed appendages (thoracopods). Fused with and largely covered by carapace. (Syn. pereopod) [Stachowitsch, 1992].