Antromysis (Antromysis) cenotensis Creaser, 1936

Pesce, Giuseppe L. & Iliffe, Thomas M., 2002, New records of cave-dwelling mysids from the Bahamas and Mexico with description of Palaumysis bahamensis n. sp. (Crustacea: Mysidacea), Journal of Natural History 36 (3), pp. 265-278 : 275-276

Antromysis (Antromysis) cenotensis Creaser, 1936

(figures 14-21)

Material examined. Yucatan, Mexico: Cenote Ucil , Cenotillo; 15 December 1991, two females (3.5, 3.8 mm) collected with 93 m m plankton net from water column in 0-10 m depths. Cenote Mucuyché , Mucuyché, Yucatan, Mexico; 4 July 1999; eight females (3.4-4.1 mm), three males (3.1-3.3 mm) and two juveniles collected with plankton net from water column in 20-37 m depths .

Remarks. The species is widespread in groundwaters of the northern Yucatan Peninsula. Bowman (1977) did not fi nd`obvious differences among specimens from the various localities’. On the contrary, in our specimens we pointed out relevant variation, also in the same sample, regarding the shape and the armature of the telson, which is slightly longer than wide [vs nearly as long as wide, both in Creaser’s (1936) and Bowman’s (1977) description and figures] and bears four to six (2+ 2; 2+ 3; 3+ 1+ 2) apical spines, in some specimens the medial fused with the telson [vs always four apical articulated spines (2+ 2) in the original and subsequent descriptions and illustrations] (figures 14, 17, 18, 20, 21). Another minor difference is the presence on our specimens of two (vs one) setae on the basal inner margin of the male pleopod 4 (fi gure 19), and the eye stalks (fi gure 16) closer to each other than in previous descriptions.

In our opinion, the above differences, however, could fi t the wide variability of this species, which is widespread in groundwaters of the Yucatan karst system.

In Cenote Mucuyché, Mucuyché, Yucatan, Mexico, Antromysis (Antromysis) cenotensis lives in association with Stygiomysis holthuisi .