FISHERY BULLETIN: VOL. 83, NO. 1 



Remarks. — Arana Espina and Mendez G. (1978) 

 graphed the size distribution of each sex in sam- 

 ples of this shrimp from the Golfo de Guayaquil. 

 They included correlations between carapace 

 length and total length, total weight, and abdomi- 

 nal weight. They determined that the relative 

 growth rate in males is higher than that in 

 females, and that within the size range of the 

 shrimp studied, eight molts occurred with an in- 

 crease of 7.25% at each molt. 



Although Castro (1966) did not cite S. aliaffinis 

 by name, he stated that among the specimens of 

 "Eusicyonia" collected off Puerto Pehasco and near 

 Isla de San Jorge, Sonora, Mexico, there were some 

 bearing a 9-like shaped spot, which undoubtedly 

 indicates that they belonged to this species. 



Commercial im,portance . — Sicyonia aliaffinis, 

 like the other six relatively large species of the 

 genus occurring in the American Pacific, is fre- 

 quently taken together with other penaeoids of 

 greater economic value. In the Gulf of California it 

 is present in the commercial catches made on the 

 eastern side. In some other areas along its range, 

 e.g., the Golfo de Guayaquil (Arana Espina and 

 Mendez G. 1978), it is found in quantities that 

 might support development of a fishery. 



Material. — 251 specimens from 27 lots. 



Mexico— Baja California Sur: 2c5 19, SIO, SW of 

 Isla Santa Margarita, 29-40 m, 13 November 1964, 

 Black Douglas . 16 , SIO, NW of Todos Santos, 38 

 m, 9 November 1964, Black Douglas. IS, YPM, 

 Bahia San Lucas, 24 m, 7 May 1936, Zaca stn 

 135D-26. Id 19, USNM, W of Estero de los Al- 

 godones, 47 m, 3 April 1978, Toral Garcia. Id, 

 YPM, Bahia Santa Ines, 37 m, 10 April 1936, Zaca 

 stn 141-D4. Nayarit: 57d 389 , SIO, NE of Isla 

 Maria Madre, 51 m, 31 March 1973, Agassiz. 15d 

 89, SIO, NE of Isla Maria Madre, 55 m, 31 March 

 1973, Agassiz. Jalisco: 19, USNM, Puerto 

 Vallarta, 13 April 1937. 29 , SIO, N part of Bahia 

 Chamela, 15-18 m, 2 April 1973, Agassiz. Oaxa- 

 ca: 13d 139, USNM, E of SaUna Cruz, Golfo de 

 Tehuantepec, 18 m, 10 July 1963, 1. Mayes A. 2d 

 19, SIO, Golfo de Tehuantepec, 55 m, 6 June 1965, 

 T. Matsui. 19, USNM, Laguna Lagartero, 

 Ixhuatan, 25 July 1963, G. Solorzano. 

 Chiapas: 2d 19, USNM, Puerto Arista, 14 

 January 1964, I. Mayes A. 8d 89 , SIO, Golfo de 

 Tehuantepec, 46-48 m, 10 April 1973, Agas- 

 siz. 3d 29 , SIO, Golfo de Tehuantepec, 73 m, 10-11 

 July 1963, D. Dockins. Id, holotype, YPM, off 

 "southern Mexico" [NW of Puerto Madero], 35-55 



m, 9 April 1926, Pawnee. 17d 389, SIO, W of 

 Puerto Madero, Golfo de Tehuantepec, 55 m, 10 

 April 1973, Agassiz. 



Guatemala — Id, AHF, off San Jose light, 42 m, 

 23 March 1939. 



Costa Rica— Id , USNM, near Quepos, 242 m, 26 

 April 1973, Enriqueta. 



Panama— Id, AHF, Isla Taboga, 4-9 m, 2 May 

 1939. Id, USNM, Bahia Santelino, 1.6 km N of 

 Punta de Cocos, Archipielago de las Perlas, 9 Feb- 

 ruary 1939. 19 , USNM, S of Isla del Rey 44-42 m, 

 7 May 1967, Pillshury stn 551. 19 ,USNM, SW of 

 Bahia San Miguel, 55 m, 7 May 1967, Pillsbury stn 

 549. 2d 19, USNM, 12 km NW of Punta 

 Caracoles, Darien, 84 m, L. G. Abele. 



Ecuador— 19, USNM, S of Isla Seymour, 

 Galapagos, 7-13 m, 9 March 1938, F E. Lewis. 19 , 

 USNM, off Playas, Golfo de Guayaquil, 16 m, 1976, 

 P Arana Espina. 



Peru— Id, USNM, off Caleta Cruz, 10-14 m, 

 1970, E. Valdivia. 



Sicyonia martini Perez Farfante and Boothe 



1981 

 Figures 38, 43-46 



Eusicyonia species, Burkenroad 1938:81, fig. 26, 



28-30. 



Sicyonia martini Perez Farfante and Boothe 



1981:424, fig. 1-4 [holotype 9, USNM 180235; 



type-locality: SW of Punta Ana Maria, Golfo de 



Panama, 7°50'30"N, 78°49'00"W, 58 m, 



Pillsbury stn 556]. 



Vernacular names: rock shrimp (United States); 

 camaron de piedra, camaron de roca (Mexico); 

 camaron conchiduro (Mexico, Panama). 



Diagnosis. — Antennal spine well developed and 

 buttressed. Second abdominal somite with dor- 

 somedian carina lacking incision. First pereopod 

 with basis and ischium unarmed. Postrostral ca- 

 rina bearing one tooth posterior to level of hepat- 

 ic spine and raised in high crest behind posterior 

 tooth. Rostrum long, conspicuously overreaching 

 distal margin of eye. Abdomen tuberculate; second 

 and third somites bearing unusual inverted 

 V-shaped ridges laterally; fifth somite with dor- 

 somedian carina sharply truncate posteriorly. 

 Petasma with distal projection of dorsolateral 

 lobule tapering distally to minutely bifurcate tip, 

 arms sharp. Thelycum with plate of sternite XIV 

 bearing anteromedian tubercle. Branchiostegite 

 without 9-shaped color pattern. 



52 



