Lemaitre and Rodngues. A new species of ghost shrimp Lepidophthalmus sinuensis 



625 



(MZUSP), and in the zoological collections of the Uni- 

 versity of Southwestern Louisiana, Lafayette (USLZ). 

 The abbreviation "CL" refers to carapace length 

 measured along the dorsal midline from the level of the 

 posterior orbital margin to the posterior end of the 

 carapace. Two in situ burrow casts were made using 

 epoxy resin (Araldit with hardener), following the 

 method described by Dworschak (1983). 



Lepidophthalmus sinuensis new species 

 Figures 1-4 



Material examined 



Agrosoledad S.A. shrimp farm, 3 mi inland from mouth 

 of Rio Sinu, Departamento de Cordoba, Colombia 

 (9°17'N, 75°50'W): 1 cr, holotype (CL 11.8 mm), pond 

 5, 20 Aug. 1990, USNM 252399; 25 o- (CL 5.2-13.4 

 mm), 24 9 (CL 3.5-9.1 mm), pond 5, 20 Aug. 1990, 

 USNM 252400, 252401, MZUSP 10751, USLZ 3027; 

 5 o- (CL 4.9-11.6mm), 5 9 (1 ovig.) (CL 7.2-10.3mm), 

 pond 7, 20 Aug. 1990, USNM 252402. Bungalow 

 beach near San Bernardo del Viento, Departamento de 

 Cordoba, Colombia (9°17'N, 76°00'W): 1 o- (CL 11.0 

 mm), 5 9 (1 ovig.) (CL 8. 3-11. 8mm), July 1990, coll. 

 J. Araujo, USNM 252404, 252405; 3 o- (CL 10.5-13.8 

 mm), 7 9 (1 ovig.) (CL 8. 6-13. 2mm), drainage canal, 

 20 Aug. 1990, USNM 252403. 



Description 



Frontal margin of carapace with blunt rostral spine and 

 two fixed subrectangular lateral projections (Fig. lc); 

 rostral spine and lateral projections directed slightly 

 upward; rostral spine reaching to about 2/3 length of 

 eyestalks, lateral projections reaching to about mid- 

 length of rostrum. Anterior margin of carapace level 

 between subrectangular lateral projections and margin 

 of antennal peduncle, then curving forward to antero- 

 lateral angle of branchiostegite. Dorsal oval about 0.6 

 times length of carapace, smooth, weakly delimited 

 anteriorly. 



Eyestalks reaching to about 2/3 length of basal anten- 

 nular segment, terminating distally in two subtrian- 

 gular blunt protuberances (shorter dorsal, larger ven- 

 tral). Cornea small, pigmented, centrally situated on 

 the eyestalk. Antennular peduncle stouter than anten- 

 nal peduncle, first (basal) segment shorter than second; 

 third segment about 2.5 times as long as second; sec- 

 ond and third segments with dense setation on ventral 

 margin; flagellum with subequal rami. Antennal pedun- 

 cle reaching to about midlength of ultimate antennular 

 segment; flagellum about twice as long as antennular 

 flagellum. 



Mandible with several teeth on molar process, and 

 long two-segmented palp. Maxillule with endopod 

 curved distally. Maxilla, first and second maxillipeds 

 as figured (Fig. 2c-e). Third maxilliped with slender, 

 curved dactyl shorter and narrower than propodus; 

 propodus about as long as wide, outer surface naked, 

 inner surface with tuft of setae on posterior half; carpus 

 with tuft of setae on inner surface near distal margin; 

 with rudimentary exopod. 



Branchial formula: 



maxillipeds pereopods 



12 3 12 3 4 5 



Pleurobranchs — — — — — — — — 



Arthrobranchs - 1* 2 2 2 2 2 



Podobranchs — — — — — — — — 



Epipods 1 1 



Exopods 11 1* - - - - - 



* rudimentary 



Chelipeds strongly dissimilar, major cheliped on right 

 or left side. Sexual dimorphism evident on major and 

 minor chelipeds. Major cheliped of male (Fig. 3a) 

 massive, reaching to about tip of antennal flagellum. 

 Fingers leaving large gap proximally when closed. 

 Dactyl longer than palm, smooth except for tufts of 

 setae on dorsal margin and on basal outer surface of 

 teeth; prehensile edge with 4-6 large, unequal, rounded 

 teeth; inner face of dactyl with deep longitudinal 

 groove. Fixed finger with strong tooth (pointing slight- 

 ly outward and forward) near middle of prehensile edge 

 and under second tooth of dactyl. Palm with scattered 

 tufts of setae on outer face, row of tufts of setae on 

 dorsal margin, and tufts of very long setae (reaching 

 to about 2/3 length of dactyl) near dorsomesial distal 

 angle; dorsal and ventral margin defined by keel-like 

 ridge; outer face with several small tubercles bearing 

 tufts of setae on sloping depression near base of fixed 

 finger; inner face of palm (Fig. 3b) with tubercles bear- 

 ing tufts of setae on ventromesial margin and on slop- 

 ing depression near base of fixed finger. Carpus longer 

 than palm, broader than long, dorsal and ventral 

 margin defined by keel-like ridge, with small blunt 

 tooth on dorsodistal and ventrodistal angle. Merus 

 about as long as carpus, with row of three blunt spines 

 on ventromesial distal margin. Ischium slender, slightly 

 shorter than merus, armed with row of 14 small spines 

 on ventrolateral margin. 



Major cheliped of female strong but shorter, less high 

 than in male. Fingers with tips strongly curved inward, 

 crossing when closed; prehensile edge of dactyl and 

 fixed finger straight or irregular (Fig. 3d,e), with small 

 rounded teeth; fixed finger usually with strong, sharp 

 tooth basally on outer face. Merus with ventromesial 

 distal row of blunt to sharp spines, and usually with 



