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Order Nectiopoda Schram, 1986
Diagnosis. – Cephalon with bifurcate, pre-antennular ventral filaments. Antennular peduncle fused, with long, filamentary aesthetascs. Antennae small, paddle-like; endopod 3-segmented, bent or as semicircular arc; exopod 1-segmented paddle. Mandibles lacking palps. Maxillules with 6-7 segments; terminal segment developed as fang-like claw, with a single pore at the tip. Maxillae and maxillipeds subequal; terminal segments developed as complex claws equipped with a cluster or arc of denticles typically opposed by a thumb-like pad bearing a row of filamentary, flexible setae. Maxillae with three lobate endites on basal segment. Maxillipeds 9-segmented, with 5 segments distal to elbow; endites of basal segments reduced, pad-like. Trunk limbs with 3-segmented exopod; endopod 4-segmented, basal segment reduced; anterior and posterior trunk limbs more slender than those of mid-trunk, armature more reduced. Anal segment with simple caudal rami.
Remarks. – The Nectiopoda include two families, the Godzilliidae Schram, Yager & Emerson, 1986, and the Speleonectidae Yager, 1981. The maxillipeds of a number of nectiopods are described as being composed of 8 segments. However, a reinvestigation of collection and type material did not confirm this. Maxillipeds appeared to be 9-segmented in all specimens evaluated, although some taxa in both families, Speleonectidae and Godzilliidae, show a tendency to reduce the size and articulation of the basal segments.
(From Koenemann, Iliffe and van der Ham 2003)