PEREZ FARFANTE: ROCK SHRIMP GENUS SICYONIA 



February 1974, H. G. Moser stn 13. 16, SIO, off 

 Bahia Magdalena, 88 m, 3 February 1964, C. 

 Hubbs. 5c? 69, SIO, Bahia Almejas, 21-24 m, 11 

 November 1964, Black Douglas. 506 509, SIO, 

 SW of Isla Santa Margarita, 29-40 m, 13 November 

 1964, Black Douglas . 406 409 , SIO, 3 km SW of 

 Isla Santa Margarita, 46-57 m, 13 November 1964, 

 Black Douglas. 186 89, SIO, SW of Isla Santa 

 Margarita, 75-80.5 m, 13 November 1964, Black 

 Douglas. 16 59, SIO, SW of Isla Santa Mar- 

 garita, 88-90 m, 13 November 1964, Black Doug- 

 las. 36 29, SIO, W of Punta Tasca, Isla Santa 

 Margarita, 7 July 1955, Andres stn 143. 19, SIO, 

 11 km NW of Punta Marquez, 55 m, F H. Ber- 

 ry 29 , SIO, 14.5 km WNM of Punta Marquez, 92 

 m, 4 December 1962, F H. Berry 16, YPM, 

 Bahia San Lucas, 11-37 m, 6 May 1936, Zaca stn 

 135D-11, 12. 16, SIO, Bahia Santa Ines, 40-82 m, 

 14 July 1965, C. Hubbs. 34c5 229, YPM, Bahia 

 Concepcion, 3 May 1926, Pawnee. 16 29, SIO, off 

 Santa Rosalia, 35-36 m, 25 March 1960, R. Parker 

 Baja California Norte: 16 59, SIO, S arm of 

 Bahia de los Angeles, 22-37 m, 26 April 1962, R. 

 Rosenblatt. b6 159, YPM, Bahia de los Angeles, 

 31-46 m, 13 May 1926, Pawnee. 16 69, SIO, off 

 San Felipe, 2 April 1973, C. Farwell. 4<5 29, YPM, 

 Bahia San Felipe, 19 May 1926, Pawnee. &6 59, 

 USNM, near northern end of Gulf of California, 

 9-18 m, February 1949, B. W. Walker. Sonora: 

 Id 19, USNM, Bahia de Adair, 46 m, 5 April 

 1968, Toral-Garcia. 26 39, USNM, Bahia de 

 Adair, 29 m, 5 April 1978, Toral-Garcia. 56 139, 

 USNM, off Bahia de San Jorge, 26 March 1967, 

 shrimp trawler. 26 19, INP, N of Guaymas, 26 

 April 1961, H. Chapa. 16, AHF, Bahia de 

 Guaymas, 4-6 m, 22 January 1940. 19, SIO, 

 Bahia de Guaymas, 22 March 1939, M. W 

 Johnson. 26 , SIO, Bahia de Guasimas, 32 km S 

 of Guaymas, April 1968, D. Hoese. Sinaloa: 16 

 19, USNM, off Sinaloa, H. Chapa. 



Sicyonia affinis Faxon 1893 

 Figures 35-38 



Sicyonia affinis Faxon 1893:209 [syntypes: 16 19, 

 MCZ 4637, off Isla del Coco, Costa Rica, 

 5°31'30"N, 86°52'30"W, 100 fm (183 m), 28 Feb- 

 ruary 1891, Albatross stn 3367; 16, USNM 

 21169, off Isla del Coco, Costa Rica, 5°32'45"N, 

 86°55'20"W, 52 fm (95 m), 28 February 1891, 

 Albatross stn 3369; 29, USNM 21170, W of Isla 

 de Malpelo, Colombia, 3°58'20"N, 81°36'00"W, 

 112 fm (205 m), 5 March 1891, Albatross stn 

 3378. 19 , MCZ 4638, W of Isla de Malpelo, Co- 



lombia, 3°59'40"N, 81°35'00"W, 52 fm (95 m), 

 5 March 1891, Albatross stn 3379]. Faxon 

 1895:179, pi. 46, fig. 1, la-c. A. Milne Edwards 

 and Bouvier 1909:244. De Man 1911:112. 

 ?Chapa Saldaha 1964:9. Chirichigno Fonseca 

 1970:7, fig. 5. ?Rodriguez de la Cruz 1977: 

 12. Arana Espina and Mendez G. 1978:23, 

 fig. 1-5. Mendez G. 1981:47, pi. 9, fig. 75-77. 

 Perez Farfante and Boothe 1981:424. 



Eusicyonia affinis. Burkenroad 1934a:93, 

 1934b:126, 1938:84, fig. 24. Anderson and 

 Lindner 1945:317. 



Sicyonia penicillata Boone 1930:115 [part]. [Not 

 Sicyonia penicillata Lockington 1879.] 



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 

 hepatic spine and forming high crest behind pos- 

 terior tooth. Rostrum short, not overreaching 

 distal margin of eye. Abdomen lacking tubercles; 

 second and third somites lacking inverted 

 V-shaped ridges laterally; fifth somite with dor- 

 somedian carina lacking tooth or sharp angle at 

 posterior end. Petasma with distal projection of 

 dorsolateral lobule compressed distally its trun- 

 cate tip produced dorsally in simple, minute spine. 

 Thelycum with plate of sternite XIV without an- 

 teromedian tubercle and raised in paired low, but 

 well-defined bulges. Branchiostegite lacking large 

 mark. 



Description. — Body relatively slender (Fig. 35) 

 and lacking tubercles. Carapace studded with 

 numerous short setae, those on anterior part of 

 dorsum forming dense patches. First five abdomi- 

 nal somites with paired broad patches of short 

 setae flanking dorsomedian carina; sixth with one 

 in dorsolateral depression. 



Rostrum short, reaching only as far as distal 

 margin of eye, its length 0.25-0.35 cl; upturned to 

 angle between 10° and 40°; armed with two dorsal 

 teeth and three minute apical teeth; latter dis- 

 posed on truncate apex with ventralmost one 

 either terminal or subterminal; first dorsal tooth 

 located distinctly anterior to orbital margin, sec- 

 ond tooth situated at about anterior 0.25 cl of ros- 

 trum. Conspicuous adrostral carina, subparallel 

 and distinctly dorsal to ventral margin, extending 

 almost to end of rostrum. 



Carapace with well-marked postrostral carina 

 bearing two teeth; epigastric tooth, situated 



43 



