PfeREZ FARFANTE: ROCK SHRIMP GENUS SICYONIA 



38-35 m, 16 September 1966, Anton Bruun 18B 

 stn 785. 



Ecuador— 19, USNM, Golfo de Guayaquil, 32 

 m, 11 September 1966, Anton Bruun 18B stn 772. 



Peru— 13d 229, USNM, off Tumbes, 13 m, 10 

 September 1966, Anton Bruun 18B stn 768. 169, 

 USNM, off Caleta Cruz, Tumbes, November 1979, 

 Promaresa. 16d, USNM, off Caleta Cruz, 

 Tumbes, November 1979, Promaresa. 16d, 

 USNM, off Caleta Cruz, Tumbes, November 1979, 

 Promaresa. 169, USNM, off Caleta Cruz, 

 Tumbes, November 1979, Promaresa. 69, 

 USNM, off Negritos, 16 m, 2 June 1966, Anton 

 Bruun 16 stn 624-B. 26 19, USNM, Paita, 1969, 

 J. Sanchez and E. Valdivia. 29, USNM, NW of 

 Paita, 40 m, 1977. 



Sicyonia ingentis (Burkenroad 1938) 

 Figures 52, 57-60 



Eusicyonia ingentis Burkenroad 1938:88, fig. 31-34 

 [holotype: 6, AMNH 12388; type-locality: off 

 east coast of Cedros Island (Isla Cedros), 

 28°05'N, 115°09'W, Baja California, Mexico, 38 

 fm (69 m), 27 March 1936, Zaca stn 127D- 

 1]. Anderson and Lindner 1945:318. Feinberg 

 1971:6. Frey 1971:16. 



Sicyonia ingentis. Parker 1964:162. Carlisle 

 1969:239. Longhurst 1970:272. Word and 

 Charwat 1976:19, 3 fig. Holthuis 1980: 

 61. Wicksten 1980:360. Perez Farfante and 



Boothe 1981:424. Perez Farfante 1982:371. 

 "?Sicyonia sp.", Mathews and Gonzalez, 1975:51. 

 Sicyonia ringens. Mathews, 1981:329. 



Vernacular names: ridgeback prawn, rock shrimp, 

 Japanese shrimp (United States); camaron de 

 piedra, cacahuete (Mexico). FAO names: 

 Pacific rock shrimp (English); camaron de 

 piedra del Pacifico (Spanish); boucot du Pa- 

 cifique (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 entire length, not 

 raised in crest behind posterior tooth. Abdomen 

 with tooth on dorsomedian carina of first somite 

 smaller or only slightly larger than posterior tooth 

 on carapace. Petasma with distal projections of 

 dorsolateral lobules divergent and bearing short 

 terminal filament. Thelycum with plate of ster- 

 nite XIV raised in pair of lateral bulges; posterior 

 component of median plate bearing pair of lateral 

 bosses cut by transverse suture. Branchiostegite 

 lacking large mark. 



Description. — Body slender (Fig. 57) and lacking 



Figure 57.— Sicyonia ingentis (Burkenroad 1938),? 

 36 mm cl, southeast of Punta Abreojos, Baja Califor- 

 nia Sur, Mexico. Lateral view. Scale = 10 mm. 



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