palp

A lateral appendage of the mandible or the maxilliped [Wilson, 1989].

Reduced distal portion of limb, usually only one of its rami, but may compromise both rami plus basis; usually consists of distal 2 or 3 segments following merus [Moore and McCormick, 1969].

Relatively slender 2- or 3-segmented appendage of mandible [Hobbs and Jass, 1988].

Segemented, sensory structure attached to mandible; its presence or absence, and number of segments, of taxonomic value [Butler, T.H.].

Structure found on the outer margin of the mandible, maxillule, maxilla and maxilliped, sometimes reduced or absent. Articulated on mandible and maxilliped [Holdich and Jones, 1983].

The comparatively slender 2- or 3-segmented part of the mandible [Hobbs, Hobbs, and Daniel 1977].

The two or three distal segments of the third maxilliped of crabs distal to the merus [Chace and Hobbs, 1969].

Usually one ramus (endopod), sometimes both, and basis, reduced distally to 1 to 3 segments, associated with mouthparts; also nonsegmented setose structure attached to mandible and to lateral margin of labrum in thoracic Cirripedia [McLaughlin, 1980].

(Order Diplostraca):

Elongate process of fifth endite on trunk appendage. (Syn. tactile process) [Stachowitsch, 1992].

(Order Cumacea):

Posteriorly directed distal part of maxillule. Elongate and typically bearing filaments extending into branchial chamber [Stachowitsch, 1992].

(Order Tanaidacea):

Distal projection of mouthpart (i.e., of mandible, maxillule). If fully developed, consists of three segments in the former, two in the latter. Also refers to distal section (endopod) of maxilliped or to terminal process on each lobe (paragnath) of lower lip (labium) [Stachowitsch, 1992].

(Order Decapoda):

Branch-like projection of mouthpart (mandible, maxillule, maxilla, or first maxilliped); consists of distal portion of mouthpart and is typically endopodal in nature. (one-, two-, three-segmented/jointed; club-shaped, flattened, recurved) [Stachowitsch, 1992].

(Order Amphipoda):

Distal projection of mouthpart (mandible, maxillule, maxilla, maxilliped). Represents endopod and, if fully developed, consists of five segments (ischium, merus, carpus, propodus, dactylus). (one- to five-segmented/articulate) [Stachowitsch, 1992].

(Order Isopoda):

Articulated ramus consisting of one to three articles in mandible, of up to five articles in the maxilliped [Kensley and Schotte, 1989].

(Order Isopoda):

Articulated ramus consisting of one to three articles on the mandible, and up to five articles on the maxilliped. (Palps do not occur on the maxillules or maxillae of isopods.) [Wetzer et al. 1997].

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^{Nomenclature of isopod cephalon (A). Examples of isopod mouth appendages: Idoteidae (B, C, F, H); Cirolanidae (D, E, G, I). [Wetzer et al. 1997]}

(Order Isopoda):

Distal projection of mandible or maxilliped. Represents endopod and basically consists of three segments in mandible, five segments in maxilliped [Stachowitsch, 1992].

(Order Mysida):

Distal projection of mouthpart (mandible, maxilla, rarely maxillule). Three-segmented and well-developed in mandibles, two-segmented in maxillae. Represents endopod in posterior mouthparts [Stachowitsch, 1992].

(Order Stomatopoda):

Relatively slender, typically three-segmented branch of mandible. Occasionally also refers to small endopod of maxillule. (one-, two-, three-segmented) [Stachowitsch, 1992].

(Order Leptostraca):

Branch-like projection of mouthpart (mandible, maxillule, maxilla). May represent various parts of appendage (e.g, endopod, exite) [Stachowitsch, 1992].

(Subclass Branchiura):

Slender medial projection of each antennule. Consists of two to three segments and may be tipped by setae. Formerly termed flagellum (along with thin epipodsflabella- of first two thoracopods). (uniramous, biramous) [Stachowitsch, 1992].

(Subclass Cirripedia):

One of two projections from lateral margins of labrum; in acrothoracican, one of two projections from each mandible [Stachowitsch, 1992].

(Subclass Copepoda):

The basis plus rami of a limb. The palp may be reduced to a poorly-sclerotized extension of the exoskeleton bearing a crown of small setae corresponding to the terminal setae of one or both rami [Ferrari and Dahms, in press].

(Subclass Copepoda):

The part of the mandible or maxillule distal to the segment bearing the gnathobase or arthrite respectively [Boxshall and Halsey, 2004].

(Class Ostracoda):

Biramous, more distal part of fully developed mandible (gnathobase, palp) or maxillule (protopod, palp). Consists of inner branch (endopod) and outer branch (exopod) [Stachowitsch, 1992].

(Class Ostracoda):

Distal part of manible. Basically biramous (with endopod and exopod), although basis and endopod form its principal component [Stachowitsch, 1992].

(Class Ostracoda):

Term used for a podocopan arm-like jointed portion (endopod or endopod plus basis) of limb, either directed forward and used for food manipulation, or directed backward and used for clasping [Cohen, Peterson, and Maddocks, in press].

(Superorder Syncarida):

In anaspidacean and bathynellacean, distal projection of mandibles. (one- to three-segmented; prehensile, not prehensile) [Stachowitsch, 1992].

(Order Thermosbaenacea):

Distal projection of mouthpart. Considered to represent inner branch (endopod) in mandible, maxillule, and maxilla, outer branch (exopod) in maxilliped [Stachowitsch, 1992].

(Order Euphausiacea):

Distal projection of mouthpart (mandible, maxillule, maxilla). Generally considered to be endopodal in nature. (unsegmented, two-/three-segmented) [Stachowitsch, 1992].