PEREZ FARFANTE: ROCK SHRIMP GENUS SICYONIA 



off Golfo de Panama, 232 m, 8 March 1891, Alba- 

 tross stn 3387. IS 29 , USNM, S of Isla San Jose, 

 84 m, 6 May 1967, Pillsbury stn 529. bS 69, 

 USNM, S of Isla San Jose, 99 m, 7 May 1967, 

 Pillsbury stn 553. 19 , USNM, SE of Isla San Jose, 

 68 m, 7 May 1967, Pillsbury stn 555. 26 39, 

 USNM, SE of Isla San Jose, 60 m, 5 March 1888, 

 Albatross stn 2797. 26 , USNM, S of Isla del Rey, 

 44-47 m, 7 May 1967, Pillsbury stn 551. 16 19, 

 USNM, S of Isla del Rey, 59 m, 8 May 1967, 

 Pillsbury stn 556. 16 59 , USNM, SW of Golfo de 

 San Miguel, 64-60 m, 7 May 1967, Pillsbury stn 

 550. 



Colombia— Call: 2c?, USNM, off Bahia de 

 Buenaventura, 80 m, 16 September 1966, Anton 

 Bruun, 18B, stn 783. 



Ecuador — Manabi : many 6 and 9 , USNM, off 

 Cabo Pasado, 93 m, 12 September 1966, Anton 

 Bruun, 18B, stn 778. 16 39, USNM, off Bahia de 

 Manta, 120-150 m, 12 September 1966, Anton 

 Bruun, 18B stn 776. 36 39, USNM, off Cabo San 

 Lorenzo, 185 m, 12 September 1966, Anton Bruun, 

 18B, stn 775. 16 19 , AHF, off Isla La Plata, 82-101 

 m, 10 February 1934. El Oro: 26 , USNM, SW 

 of Isla Santa Clara, depth unrecorded, 10 Sep- 

 tember 1966, Anton Bruun, 18B, stn 769-D. 27d 

 679, USNM, SW of Puerto Bolivar, 80 m, 10 Sep- 

 tember 1966, Anton Bruun, 18B, stn 769. 



Peru— Tumbes: lid 89, USNM, off Casitas, 

 90 m, 8 September 1966, Anton Bruun, 18B, stn 

 764. Piura: 46 49, USNM, Bahia de Paita, 

 70-69 m, 8 September 1966, Anton Bruun, 18B, stn 

 762-A. 26 49 , USNM, Bahia de Paita, 118-133 m, 

 2 June 1966, Anton Bruun, 16, stn 625-A. 16, 

 USNM, SW of Isla Foca, 120 m, 7 September 1966, 

 Anton Bruun, 18B, stn 761. 46 109, USNM, off 

 Punta Negra, 100 m, 4 June 1966, Anton Bruun, 

 16, stn 631- A. Lambayeque: Id 19 , IMARPE, 

 Islas Lobos de Afuera, 360-400 m, 1977, R. Mar- 

 quina. 



Sicyonia disdorsalis (Burkenroad 1934) 

 Figures 52-56 



Eusicyonia disdorsalis Burkenroad 1934a: 96, fig. 

 25, 36 [syntypes: Id 19, YPM 4391, 5d 69 (not 4d 

 79 as originally cited), YPM 5075, and Id 19, 

 YPM 4391, Pearl Islands (Archipielago de las 

 Perlas), 8°29'40"N, 78°52'30"W, Golfo de 

 Panama, 19-24 fm (35-44 m), 31 March 1926, 

 Pawnee; 56 59 (not 6d 49), YPM 5079, and 19, 

 YPM 5078, Golfo de Panama, 1868, F H. Brad- 

 ley Id 39, YPM 5076, and Id, YPM 5077, west 

 coast of Central America, 1872, Capt. Dow]. 



Burkenroad 1938:87. Anderson and Lindner 

 1945:318. 

 Sicyonia disdorsalis. Chirichigno Fonseca 1970:7, 

 fig. 4. Bayer et al. 1970:A97. Del Solar et al. 

 1970:18. Rosales Juarez 1976:41, pi. 1, fig. 3. 

 Rodriguez de la Cruz 1977:11. Arana Espina 

 and Mendez G. 1978:29, fig. 14-17. Brusca 

 1980:256. Paul and Hendrickx 1980: 



110. Sosa Hernandez et al. 1980:14. 

 Mendez G. 1981:48, pi. 10, fig. 87-90. Per- 

 ez Farfante 1982:370. 



Vernacular names: rock shrimp (United States); 

 camaron conchiduro (Mexico, Panama); cama- 

 ron duro (Ecuador, Peru); langostino cascara 

 dura, camaron cascara dura (Peru). FAO 

 names: keeled rock shrimp (English), camaron 

 carenado (Spanish), boucot carene (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 one tooth posterior to level of he- 

 patic spine and low throughout its entire length, 

 not raised in crest behind posterior tooth. Abdo- 

 men with tooth on dorsomedian carina of first so- 

 mite considerably larger than posterior tooth on 

 carapace. Petasma with distal projection of dor- 

 solateral lobule curved mesially, tapering to apex, 

 and lacking filament. Thelycum with plate of 

 sternite XIV raised in pair of lateral bulges; pos- 

 terior component of median plate flat or slightly 

 raised laterally. Branchiostegite lacking large 

 spot or ocellus. 



Description. — Body relatively slender (Fig. 53). 

 Carapace bearing patches of short setae on dor- 

 sum, antero ventral to hepatic spine, and ventral to 

 hepatic sulcus; patches of setae also present on 

 dorsal extremity of abdominal sulci and in depres- 

 sion of sixth abdominal somite. Abdomen with 

 numerous tubercles on first three somites. 



Rostrum relatively short, rarely overreaching 

 eye, its length increasing linearly with carapace 

 length (Fig. 54) to about 18 mm cl, then increasing 

 little, not surpassing 6.2 mm ^proportional length 

 decreasing with increasing size from as much as 

 0.36 to as little as 0.21 cl); slender but occasionally 

 moderately deep; in males subhorizontal with tip 

 strongly decurved, in females upturned as much 

 as 20° with tip slightly decurved; armed with 

 three, occasionally two, dorsal teeth and two or 

 three apical teeth (2+2, 2%, 3+2, 92%, 3+3, 6%); 



63 



