FISHERY BULLETIN: VOL. 71, NO. 2 



Colombia 



1 / 1 ■? , UMML, off Islas de San Bernardo, 

 1,271 m, 4 November 1970, Oregon II stn 11240. 

 3 / USNM, off Isla de Bani, 1,097 m, 5 Novem- 

 ber 1970, Oregon II stn 11242. 1 * , USNM, 

 off Puerto Colombia, 1,097 m, 8 November 1970, 

 Oregon II stn 11245. 1 / 1 *, TAMU, N of 

 Cabo de la Aguja, 4,152 m, 24 July 1970, 

 Alaminos stn 70-A-10-48. 1 *, USNM, NW 

 of Peninsula de la Guajira, 1,500 m, 27 July 

 1966, Pillsbury stn 454. 



Description 



Body slender and lacking setae (Figure 1). 

 Dorsum of carapace almost straight or very 

 slightly convex, convexity extending beyond 

 postcervical sulcus (Figure 3A). Rostrum styli- 

 form, straight to slightly upturned in young 

 (Figure 2), pronouncedly inclined dorsad in 

 large individuals of both sexes; in young 

 females and, apparently, in all males length of 

 rostrum not exceeding 0.70 that of carapace, 

 in larger females rostral length increasing with 

 increasing size of shrimp to as much as 1.25 

 length of carapace, and surpassing antennular 

 peduncle by about 0.3 of its own length. Rostral 

 teeth 3, first tooth located slightly posterior 

 to orbital margin, and rather far from second 

 tooth; second and third teeth separated by 

 interval varying from 0.3 to 0.6 of distance 

 between first and second tooth. Postrostral 

 carina (inconspicuous in young individuals) 

 long, extending to about 0.8 length of carapace. 



and followed by rather minute dorsal tubercle, 

 located near posterior margin; adrostral carina 

 extending from orbital margin to near tip of 

 rostrum, stronger and sharp basally. Orbital 

 spine absent; antennal spine short, acute; 

 branchiostegal spine produced and sharp; 

 hepatic spine prominent. Cervical sulcus well 

 marked, extending to middorsum of carapace, 

 ending there at about 0.45 length of carapace 

 from orbital margin; postcervical sulcus faint, 

 concave except for almost straight, short, dorsal 

 portion, ending at middorsum of carapace at 

 0.3 of carapace length from posterior margin; 

 hepatic sulcus almost horizontal; orbito- 

 antennal sulcus short and linear; branchio- 

 cardiac sulcus well marked, its length slightly 

 more than half that of carapace, extending from 

 near posterior margin of carapace to posterior 

 end of hepatic sulcus. 



Antennular peduncle length about 0.55 that 

 of carapace; stylocerite produced distally into 

 very slender, sharp spine, barely reaching base, 

 or extending to midlength, of acute distolateral 

 spine; first segment bearing minute ventro- 

 mesial spine in young, occasionally spine per- 

 sisting in animals of 24 mm c.l.; dorsal flagellum 

 extremely long, about 4.5 times length of 

 carapace, or 1.1 times total length of shrimp. 



Scaphocerite 2.0 to 2.1 times as long as broad, 

 and surpassing antennular peduncle by 0.1 to 

 0.2 of its own length; lateral rib produced 

 distally into sharp spine overreached by lamella; 

 antennal flagella incomplete in all specimens 

 examined. 



Labrum (Figure 4A, B) consisting of two 



Figure 2. — Hepomadus tener. Anterior region, / 28 mm c.l., mouth of Delaware Bay, Del. 



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