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image of Journal of Crustacean Biology

ABSTRACT A new genus and species, Hlrsutia bathyalis, created for a single, small peracaridan crustacean collected at a depth of 1,000 m from the sea floor off northeastern South America, provides the basis for one of two new families, the Hirsutiidae, of the new Order Mictacea erected by Bowman et al. (1985). Hirsutia uniquely possesses a number of morphological features found neither in other peracaridan orders nor in the second species, Mictocaris halope, and family, the Mictocarididae, of the Mictacea (Bowman and Iliffe, 1985). These include paragnaths that have elongate, slender anterior extensions that are probably sensory; an absence of grooming armature on the medial surface of the mandibular palp; unusually long setal armature on the pereiopodal basal-endopodal shaft relative to other peracaridan Crustacea; "oostegites" that arise from the posterior rather than the medial surface of the coxa as in all other known Peracarida, supporting Claus's (1885) century-old contention that oostegites are modified epipodites. Certain morphological features of Hirsutia suggest that it possesses the potential of being a facultative carnivore.

Affiliations: 1: (HLS) Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543;; 2: (RRH) Scripps Institution of Oceanography, La Jolla, California 92093;; 3: (SPG) Department of Marine Biology and Chemistry, Institute for Marine Biology and Limnology, Oslo University, Blindern, Oslo 3, Norway.


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