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 pairs of walking legs in Brachyura. Each pereopod comprises the seven articles coxa, basis and endopodal articles ischium to dactyus, plus sometimes an exopod (attached to the basis) [Poore, 2004].

One of the five posterior paired appendages or legs of the cephalothorax (Fig.1, 3C) [Perez Farfante and Kensley, 1997].

One of the seven pereonal appendages. Consists of the following segments: coxa, basis, ischium, merus, carpus, propodus, dactylus. The coxa of adult female bears oostegites. The distal five podomeres are homologous with the endopod of the more primitive biramous thoracic limb of other Crustacea [Wilson, 1989].

Thoracic appendage used in locomotion. (Syn. paraeopod, pereiopod, ambulatory leg, walking leg) [McLaughlin, 1980].

Uniramous appendage of the pereon (walking leg) usually of seven articles [Holdich and Jones, 1983].

(Order Cumacea):

One of five pairs of appendages of pereon. Basically biramous, consisting of basal section (coxa, basis) bearinf five-segmented endopod (ischium, merus, carpus, propodus, dactylus) as well as smaller exopod. Number of pereopods bearing exopods is of taxonomic importance. (with/without exopod). (Syn. peraeopod, pereiopod) [Stachowitsch, 1992].

(Order Tanaidacea):

One of seven pairs of appendages (thoracopods 2-8) of pereon. First pair developed as chelipeds (leading to alternate nomenclature in which only six pairs of pereopods are recognized). (uniramous, biramous = with/without exopod; with/without ischium). (Syn. peraeopod, pereiopod) [Stachowitsch, 1992].

(Order Decapoda):

One of two appendages on each side of last five thoracic somites (appendage pairs of first three being modified as maxillipeds). Basically biramous, consisting of protopod, endopod, and exopod; exopod is often reduced, resulting in seven-segmented limb (coxa, basis, ischium, merus, carpus, propodus, dactylus). (ambulatory, natatory; biramous, uniramous; achelate, chelate, subchelate; equal, subequal, unequal; elongate, filiform, flagelliform, flattened, paddle-shaped, slender, stout; denticulate, granulate, hairy, pubescent, smooth, spinose, spinulose, tuberculate, unarmed). (Syn. pereiopod, peraeopod) [Stachowitsch, 1992].

(Order Amphipoda):

One of up to seven pairs of appendages of pereon. Uniramous, consisting of modified (immovable) coxa (coxal plate) and six free segments (basis, ischium, merus, carpus, propodus, dactylus). Anterior two pairs may be differentiated as gnathopods. (simple, chelate, subchelate; ambulatory, raptorial). (Syn. peraeopod, pereiopod, walking leg) [Stachowitsch, 1992].

(Order Isopoda):

One of up to seven pairs of appendages of pereon. Uniramous, consisting of coxa, basis, ischium, merus, carpus, propodus, and dactylus. Anterior one or two pairs may be differentiated as gnathopods. (Syn. peraeopod, pereiopod) [Stachowitsch, 1992].

(Order Isopoda):

Paired appendage of the pereon, consisting of seven articles when unmodified [Kensley and Schotte, 1989].

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^{Schematic representation of an isopod illustrating morphological terms. [Kensley and Schotte, 1989]}

(Order Isopoda):

The paired legs of each pereonite [Wetzer et al. 1997].

(Order Mysida):

Term occasionally applied to appendage of thoracic somites not fused with head, i.e., thoracic appendages not modified as mouthparts (maxillipeds). (Syn. peraeopod, pereiopod) [Stachowitsch, 1992].

(Class Ostracoda):

One of four pairs of appendages used in locomotion. Pereopods represent appendages (thoracopods) of thorax segments (thoracomeres) two through five, those of first being modified as maxillipeds, those of sixth often as copulatory limbs. Biramous, consisting of proximal protopod with distal inner branch (endopod) and outer branch (exopod). The term leg is often preferentially applied to all appendages following cephalic appendages. (Syn. pereiopod, peraeopod) [Stachowitsch, 1992].

(Superorder Syncarida):

In anaspidacean and stygocaridacean, term occasionally applied to appendage of thoracic somite not fused with head, i.e., all appendages except those of first thoracomere, which is fused to head and bears maxilipeds. (Syn. paraeopod, pereiopod) [Stachowitsch, 1992].

(Order Thermosbaenacea):

One of up to seven pairs of typically biramous appendages of pereon. Represents thoracopods 2-8 (i.e., excluding first thoracopods = maxillipeds). (Syn. peraeopod, pereiopod) [Stachowitsch, 1992].

(Order Euphausiacea):

Thoracopod [Stachowitsch, 1992].