Definitions

Chelate or subtotal, prehensile maxilliped (e.g., Amphipoda); also used for first two prehensile pereiopods of amphipods whether chelate or subchelate. [Moore and McCormick, 1969]
Prehensile maxilliped; also 1st 2 prehensile pereopods of amphipods, either chelate or subchelate. [McLaughlin, 1980]
(Taxon-specific: Order Amphipoda) Modified second and third thoracopod pairs (= first and second pereopods). Uniramous, consisting of modified, immovable coxa (coxal plate) and six free segments (basis, ischium, merus, carpus, propodus, dactylus). Last segments typically form subchela. (sexually/not sexually dimorphic, polymorphic: carpo-subchelate, chelate, subchelate). [Stachowitsch, 1992]
(Taxon-specific: Order Isopoda) A loosely used term usually referring to chelate or subchelate pereopods associated with the head region and used for food handling. This term is rarely used for isopods. [Wetzer et al. 1997]
(Taxon-specific: Order Isopoda) Term applied to more anterior pereopod(s) if modified as prehensile (grasping) organ. Last segments typically form subchela. [Stachowitsch, 1992]
(Taxon-specific: Order Mysida) Term applied to thoracic endopods when these are modified as mouthparts. [Stachowitsch, 1992]