FISHERY BULLETIN: VOL. 83, NO. 1 



March 1938. M 49, UP, between Punta Ave 

 Maria and Ensenada Guayabo, 14 December 1969, 

 staff Dep. Biol. Mar, UP 3d 19, USNM, 12 km 

 NW of Punta Caracoles, staff Dep. Biol. Mar., UP 



Sicyonia pentcillata Lockington 1879 

 Figures 30-34 



Sicyonia penicillata Lockington 1879:164 [syn- 

 types (not extant): "Bolinas Bay (?Bahia de 

 Ballenas), Lower California", 14 fm (fathom) 

 (25.6 m); Angeles Bay (Bahia de los Angeles), 

 Gulf of California, W. J. Fisher]. De Man 

 1911:112. Pesta 1915:118, fig. 7. Schmitt 

 1924:387. Brusca 1973:219. Rosales Juarez 

 1976:41. Rodriguez de la Cruz 1977:10. 

 Anonymous 1980:7. Brusca 1980:256. 

 Rodriguez de la Cruz 1981:1. Mathews 1981: 

 329. 



Eusicyonia penicillata. Boone 1930:115 [part], pi. 

 36. Burkenroad 1934a:88, figs. 30, 31, 33, 

 1938:93. Steinbeck and Ricketts 1941:444. 

 Castro 1966:17 [part]. Word and Charwat 

 1976:22, 2 figs. 



Eusicyonia sp. Castro 1966:16, 17 [part], fig. 4. 



Vernacular names: rock shrimp, target shrimp, 

 Japanese shrimp (United States); cacahuete, 

 camaron de piedra, camaron de roca, camaron 

 japones (Mexico). FAO names: peanut rock 

 shrimp (English), camaron cacahuete 

 (Spanish), boucot cacahouette (French). 



Diagnosis. — Antennal spine well developed and 

 buttressed. Second abdominal somite with dor- 

 somedian carina lacking incision. First pereopod 

 with basis and ischium unarmed. Postrostral 

 carina bearing two teeth posterior to level of he- 

 patic spine. Rostrum armed with two dorsal teeth 

 (rarely one). Petasma with distal projection of dor- 

 solateral lobule acicular, long and slender. 

 Thelycum with plate of sternite XIV raised in 

 strong bulges; posterior component traversed by 

 deep groove. Branchiostegite with moderately 

 large purplish brown spot bearing poorly defined 

 yellow center. 



Description. — Body robust (Fig. 31). Carapace 

 studded with long setae anteroventral to hepat- 

 ic spine and pterygostomian region; patches of 

 densely set shorter setae present on dorsum, in 

 depression anterior to posterodorsal part of bran- 

 chiocardiac carina, on branchiostegite and along 

 hepatic sulcus; patches also on tergum of abdomi- 

 nal somites and in lateral depression of sixth so- 

 mite. Abdomen with numerous tubercles on first 

 three somites, fewer on last three. 



Rostrum short, not surpassing distal margin of 

 eye, its length increasing linearly with carapace 

 length (Fig. 32) but proportionately longer in 

 young (0.30-0.12 cl); usually straight but occasion- 

 ally curved, subhorizontal or elevated as much as 

 45°; tapering, sometimes considerably, from base 

 to truncate tip; and armed with one dorsal (rarely 

 2) and two (96%) or three (4%) apical teeth. Adros- 



FlGURE 31. — Sicyonia penicillata Lockington, 



23 mm cl, west of Punta T^sca, Isla Santa Margarita, Baja California Sur, Mexico. 

 Lateral view. Scale = 5 mm. 



38 



