maxillule

maxillule

one of the first MAXILLAE (2) of a crustacean.
References in periodicals archive ?
Maxillule with well-developed arthrite bearing four distal multicuspidate spines and three pinnate setae, and one surface seta; coxal endite, basis, exopod and endopod fused, with seven setae in all.
hospitalis Fraser, 1920 by having in the female a genital complex that is at least half the length of the cephalothoracic shield (including frontal plates) and with small, rounded posterolateral lobes, a 1-segmented abdomen that is less than one-quarter the length of the genital complex, a maxillule with two large tines on the dentiform process, a maxilliped without a myxal process, a pair of non-bifid tines on the sternal furca, the spine on the first exopodal segment of leg 3 inserted distally on the basal swelling, a 3-segmented leg 4 exopod, and the inner lobe of leg 5 not protruding beyond the posterior margin of the genital complex.
The aim of the present study is to compare the differences and similarities in the morphology of appendages (rostrum, carapace, first pereiopod, second pereiopod, fourth pereiopod) and mouthparts (third maxilliped, second maxilliped, first maxilliped, mandible, maxillule and maxilla) of A.
Sewell's (1940) and Ummerkutty's (1960) descriptions of the armature complement of the mandible, maxillule, maxilla and maxilliped lack the necessary detail and comparison with the new species presented herein could cause confusion.
Each maxillule [ILLUSTRATION FOR FIGURE 4C OMITTED] has a three-segmented endopodite located distolaterally; a large, toothed, mesially directed basal endite; and a smaller setose coxal endite that is also mesially directed.
But, the maxillules (first maxillae) of adult Dolops lack suction discs and have segmented first maxillae, each ending in a distal hook, whereas the first maxilla are transformed into large, strong, cup-shaped sucker (Fig.
Furthermore, unlike any other family of crustaceans, the remipedes perform an external predigestion of their victims, injecting them with enzymes through their nail-like modified maxillules.
major described by Rodrigues (1976) show setae and spines in the endopods of the maxillules and maxillae and, numerous setae in the maxillipeds.