PfiREZ FARFANTE: ROCK SHRIMP GENUS SICYONIA 



holotype of the former this extremity is sharply 

 angular but unarmed, contrary to what was stated 

 in the original description of the species; however, I 

 have examined a few specimens in which the angle 

 is produced in a small spine. 



Sicyonia disparri is also quite similar to S. 

 laevigata but the epigastric tooth is larger than 

 that in the latter, usually almost as large as the 

 other two teeth on the postrostral carina, and is 

 located closer to the level of the hepatic spine, i.e., 

 farther from the orbital margin, 0.12-0.25 (mean 

 0.17) cl from it rather than 0.6-0.16 (mean 0.12) cl. 

 The anteromedian pleural sulcus of the first ab- 

 dominal somite is always well defined in S. dis- 

 parri whereas it is absent or, infrequently, 

 rudimentary in S. laevigata; and the posteroven- 

 tral extremity of the fourth abdominal somite in 

 S. disparri is angular rather than rounded. Fur- 

 thermore, whereas the distal projection of the dor- 

 solateral lobule of the petasma is conspicuously 

 curved mesially in S. disparri, it is directed 

 distally and curved dorsally at its tip in S. laevi- 

 gata. 



The discussion of S. parri is based on 34 speci- 

 mens, including the holotype (YPM 4395) and one 

 male from the Bermudas, which represents the 

 second record of the species from this area. Bur- 

 kenroad (1938) reported it from the Bermudas, but 

 his record has not been cited by subsequent au- 

 thors, including me in my 1980 paper on the west- 

 ern Atlantic Sicyonia. 



Material. — 62 specimens from 20 lots. 



Mexico — Baja California Norte: 9, holotype, 

 YPM 4392, Bahia San Luis Gonzaga, 17 May 1926, 

 Pawnee. 19, paratype, YPM, Bahia San Luis 

 Gonzaga, 17 May 1926, Pawnee. 19, AHF, off Isla 

 Partida, 82 m, 8 March 1936. Baja California 

 Sur: Id 19, YPM, Bahia Santa Ines, 55 m, 11 

 April 1936, Zaca stn 142D-1. 66 49, AHF, 1.6 km 

 WSW of Punta Perico, Isla Carmen, 13-20 m, 21 

 March 1949, Velero TV. 16 , AHF, Bahia Salinas, 

 Isla Carmen, 13 m, 20 March 1940, Velero IV. 19 , 

 SIO, Bahia Salinas, Isla Carmen, 0.3 m, 13 July 

 1965, B. W. Walker. 19, CAS, Bahia Balandra, 

 Isla Carmen, 22 May 1921, F Baker 16, AHF, 

 Bahia Agua Verde, 18 m, 12 February 1940, Velero 

 III. 66 89 , SIO, NW of Isla Santa Cruz, 0-3 m, 10 

 July 1960, B. W. Walker. 26 29, SIO, Isla San 

 Jose, 3-5 m, 29 March 1967. Id 29 , AHF, Canal de 

 San Lorenzo, 11-24 m, 14 February 1940. 4d 99, 

 USNM, off Isla del Espiritu Santo, 15 m, 30 April 

 1888, Albatross stn 2824. 29, SIO, off Punta 

 Lobos, 18 m, 26 June 1961, R. Rosenblatt. Id 19 , 



USNM, Bahia La Ventana, 24-27 m, 20 April 1939, 

 Stranger stn 38. 19, SIO, Ensenada de los Muer- 

 tos, 9 m, 20 June 1961, R. Rosenblatt. Id , YPM, 

 off Punta Arena, "Arena Bank," 64 m, Zaca stn 

 136D-30. Id , SIO, E of Cabo San Lucas, 0-6 m, 12 

 June 1961, R. Rosenblatt. Nayarit: 19, AHF, 

 1.6-3 km NW of Mantanchen, 21 December 

 1961. 19 , AHF, Isla Santa Magdalena, Islas Tres 

 Marias, 5.5-9 m, 9 May 1939. 



Sicyonia mixta Burkenroad, 1946 

 Figures 12, 18-20 



Sicyonia mixta Burkenroad, 1946:3, fig. 1-4 

 [holotype, d, NR (Stockholm) 2527; type- 

 locality: "St. Joseph (probably San Jose, Lower 

 California). Swedish Eugenie Expedition 

 #818"]. Rodriguez de la Cruz, 1977:11. 



Diagnosis. — Antennal spine well developed, pro- 

 jecting from short but strong buttress. First ab- 

 dominal somite with dorsomedian carina 

 uniquely lacking anterior tooth; second abdominal 

 somite with anterior depression on dorsomedian 

 carina limited posteriorly by subvertical wall. 

 First pereopod with basis and ischium unarmed. 

 Rostrum very short, not surpassing midlength of 

 eye, bifid and bearing one dorsal tooth. Petasma 

 with distal projection of dorsolateral lobule 

 straight, but with tip curved dorsally; distal pro- 

 jection of ventrolateral lobule bifid, arms curved 

 inwardly. Thelycum with plate of sternite XIV 

 convex laterally and with deep median depression. 



Description. — Body moderately robust (Fig. 18) 

 and lacking tubercles. Carapace with long setae on 

 dorsum, arc anterior to hepatic spine, and patch 

 accompanying hepatic sulcus ventrally 



Rostrum very short, not surpassing midlength 

 of eye, its length 0.13-0.16 cl; straight; armed with 

 only one dorsal tooth situated almost at midlength 

 of rostrum, and two minute apical teeth (tip bifid); 

 ventral apical tooth located at same level or dis- 

 tinctly anterior to dorsal apical tooth. Conspicu- 

 ous adrostral carina, close and subparallel to ven- 

 tral margin, extending to base of ventral apical 

 tooth. 



Carapace with low postrostral carina ending 

 markedly anterior to posterior margin of carapace 

 and bearing three teeth: 1) epigastric tooth, small- 

 est of three but larger than dorsal rostral tooth, 

 placed well in advance of hepatic spine, between 

 0.05 and 0.08 cl from orbital margin; 2) middle 

 tooth, as large as or slightly larger than posterior 



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