thoracomere

A segment of the thorax (regardless of whether any of these segments is fused to the head) [Brusca and Brusca, 2002].

Somite of thorax [Moore and McCormick, 1969].

Somite of thorax [McLaughlin, 1980].

Thoracic segments [Brusca and Brusca, 2002].

Thoracic somite, the first two of which are incorporated into the head and bear the maxillipeds and chelipeds respectively [Holdich and Jones, 1983].

(Order Anostraca):

One of typically 11 (in certain anostracans 17 or 19) somites of thorax; each bears pair of biramous appendages (thoracopods) [Stachowitsch, 1992].

(Class Cephalocarida):

One of eight segments (somites) of thorax, of which seven or eight bear biramous appaendages (thoracopods). (Syn. thoracic segment) [Stachowitsch, 1992].

(Order Cumacea):

One if basically eight segments (somites) between head (cephalon) and abdomen (pleon). First three thoracomeres are fused with cephalon, with remaining thoracomeres (forming pereon) therefore also termed pereonites. (Syn. thoracic somite) [Stachowitsch, 1992].

(Order Tanaidacea):

One of basically eight segments (somites) of thorax between head proper and abdomen (pleon). First thoraco-mere fused with head, with first and second being fused with and covered by carapace. Accordingly, last seven or six thoracomeres are termed pereonites [Stachowitsch, 1992].

(Order Decapoda):

One of eight segments (somites) of thorax, the first three being incorporated into head; each bears pair of appendages (thoracopods). (Syn. thoracic somite) [Stachowitsch, 1992].

(Order Amphipoda):

One of basically eight segments (somites) between head (cephalon) and abdomen (pleon). First (and occasionally second) thoracomere is fused with cephalon, and remaining thoracomeres (forming pereon) therefore also termed pereonites [Stachowitsch, 1992].

(Order Isopoda):

One of basically eight segments (somites) between head (cephalon) and abdomen (pleon). First (and occasionally second) thoracomere is fused to cephalon, and remaining thoracomeres (forming pereon) therefore also termed pereonites [Stachowitsch, 1992].

(Order Mysida):

One of basically eight segments (somites) between head and abdomen. Each thoracomere bears pair of appendages (thoracopods). (entirely/not entirely covered by carapace) [Stachowitsch, 1992].

(Order Stomatopoda):

One of eight segments (somites) of thorax, the first four being covered by carapace; each bears pair of appendages (thoracopods). (Syn. thoracic segment) [Stachowitsch, 1992].

(Order Leptostraca):

One if eight segments (somites) of thorax, each bearing pair of appendages (thoracopods). All thoracomeres are covered by carapace. (Syn. thoracic somite) [Stachowitsch, 1992].

(Subclass Branchiura):

One of four segments (somites) of thorax, the first being partially fused to head; each bears pair of appendages (thoracopods). (Syn. thoracic somite) [Stachowitsch, 1992].

(Subclass Mystacocarida):

According to interpretation dividing body into cephalon, thorax, and abdomen, one of five segments (somites) of thorax, the first bearing maxillipeds and the remaining bearing thoracopods [Stachowitsch, 1992].

(Class Ostracoda):

One of basically six segments (somites) of thorax, the first being incorporated into head; each thoracomere typically bears one pair of appendages (thoracopods). (Syn. thoracic somite) [Stachowitsch, 1992].

(Superorder Syncarida):

One of basically eight segments (somites) between head and abdomen. In anaspidacean and stygocaridacean, first thoracomere (bearing maxillipeds) is fused with head. Each thoracomere bears pair of appendages (thoracopods), although in bathynellacean last pair may be absent. (anaspidacean: increasing/not increasing in length posteriorly) [Stachowitsch, 1992].

(Order Thermosbaenacea):

One of basically eight segments (somites) of thorax between cephalon proper and abdomen. First thoracomere (bearing maxillipeds) is fused with head; accordingly, last seven thoracomeres may be interpreted as being pereonites [Stachowitsch, 1992].

(Order Euphausiacea):

One of eight segments (somites) of thorax, each bearing pair of appendages (thoracopods, the most posterior pairs occasionally reduced or vestigial) [Stachowitsch, 1992].