Definitions

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Seta

A cuticular hair arising from the outside of the exoskeleton. [Warner, 1977]
A cuticular outgrowth having recognizable basal articulation. [Ingle, 1992]
A cuticular process that is clearly articulated with the basal cuticle. This structure comes in many forms. Some authors call heavily sclerotized setae "spines," even though there are smaller counterparts of the same form named "setae" by the same authors. "Spinose seta" or "spine-like seta" is more accurate.
(pl. setae) [Wilson, 1989]
An articulated cuticular extension of virtually any shape or size; may vary from very small (10-20 m) to very large (> 1 mm in length) and robust, often with a very wide base; contrary to Thomas (1970), a seta does not always have an apical pore, nor does it always have an annulus. [Watling, 1989]
Bristle-like, hair-like, or tooth-like, processes on limbs and mouth parts on many crustaceans. [Bliss, 1982]
Hair-like process of cuticle with which it is articulated; in cirripeds, bristle or spine on trophi and cirri. [Moore and McCormick, 1969]
Hairlike or needlike projection from shell of shrimps; may be simple or plumose.
(pl. setae) [Butler, T. H.]
Hairlike process of cuticle with which it articulates or through which it protrudes.
(pl. setae) [McLaughlin, 1980]
(Taxon-specific: Order Cladocera) Abdominal seta, antennal setae formula, olfactory seta, trunk appendage. [Stachowitsch, 1992]
(Taxon-specific: Order Diplostraca) One of numerous bristle-shaped projections of appendage. Setae of trunk appendages serve in feeding. According to shape one may distinguish, e.g., simple and spine-like, or brush-like setae on flagellum of antenna. [Stachowitsch, 1992]
(Taxon-specific: Order Anostraca) One of numerous, bristle-like projections extending from appendage. Those along thoracopod margins serve in feeding. Caudal rami typically fringed with plumose setae. [Stachowitsch, 1992]
(Taxon-specific: Class Cephalocarida) One of numerous bristle-shaped projections extending from appendage. number and type are of taxonomic importance. According to shape one may distinguish, e.g., simple, bifid, brush, or plumose setae. [Stachowitsch, 1992]
(Taxon-specific: Order Decapoda) Small, bristle-like projection articulating with or extending through cuticle. According to shape one may distinguish brush, cuspidate, feathered, hamate, nonplumose, pappose, plumodenticulate, plumose, serrate. setose, simple, triserrate, and triserrulate setae.
(syn. bristle, hair) [Stachowitsch, 1992]
(Taxon-specific: Order Leptostraca) One of numerous bristle-like projections extending from appendage or body. [Stachowitsch, 1992]
(Taxon-specific: Subclass Cirripedia) One of numerous bristle-like projections extending from appendage. Number, shape, and arrangement are of taxonomic importance. (lanceolate, plumose, simple). [Stachowitsch, 1992]
(Taxon-specific: Subclass Copepoda) An articulating extension of a segment, usually not directly along the proximodistal axis (see denticle and setule). [Ferrari and Dahms, in press]
(Taxon-specific: Subclass Copepoda) Slender, often plumose, armature element on paired appendages or caudal rami, with internal tissue connection through integument. [Boxshall and Halsey, 2004]
(Taxon-specific: Subclass Mystacocarida) One of numerous bristle-like projections exending from appendage or body. Number and type of setae are of taxonomic importance. Large setae on supra-anal plate and caudal rami are termed major setae. According to shape one may distinguish, e.g., simple and brush setae. (See also setule). [Stachowitsch, 1992]
(Taxon-specific: Class Ostracoda) Innervated cuticular projection of body or appendage. Typically bipartite, being divided into proximal base and distal shaft by annulation. With both sensory and mechanical functions. (chelate, compound, pappose, plumed, plumose, serrate, simple) (See also hair, pseudochaeta). [Stachowitsch, 1992]
(Taxon-specific: Class Ostracoda) One in a series of variously developed bristles projecting from margin or tip of appendage (e.g., caudal setae of caudal ramus). (simple, pinnate, plumose). [Stachowitsch, 1992]
(Taxon-specific: Class Remipedia) One of variously shapedm hair-like processes projecting from antennules, antennae, labum, paragnaths, maxillules, maxillipeds, or trunk limbs. According to shape one may distinguish comb, plumose, ribbon, simple and subsetulate setae. [Stachowitsch, 1992]