PfiREZ FARFANTE: ROCK SHRIMP GENUS SICYONIA 



through fourth abdominal somites armed 

 with curved spine; petasma with projec- 

 tions of dorsolateral lobule simple 10 



10a. Rostrum armed with 2 dorsal teeth; ab- 

 domen heavily tuberculate; anteromedian 

 pleural sulcus of first abdominal somite 

 well marked to near ventral margin of 

 pleuron; anteromedian pleural sulcus of 

 second and third somites reaching dor- 

 sally posteromedian pleural sulcus; bran- 

 chiostegite with horizontally disposed 

 9-shaped, brown mark S. aliaffinis 



10b. Rostrum armed with 3 or 4 dorsal teeth; 

 abdomen with very few tubercles; an- 

 teromedian pleural sulcus of first abdom- 

 inal somite well marked only dorsally; an- 

 teromedian pleural sulcus of second and 

 third somites not reaching dorsally pos- 

 teromedian pleural sulcus; branchioste- 

 gite with ocellate mark, consisting of red 

 center surrounded by yellow ring 

 S. picta 



11a. Dorsomedian carina of first abdominal 

 somite produced in tooth considerably 

 larger than posterior tooth on carapace, 

 that of fifth truncate or produced in spine 

 at posterior end; petasma with distal pro- 

 jections of dorsolateral lobules turned 

 mesially and lacking terminal filament; 

 thelycum with posterior component of 

 median plate flat or slightly raised pos- 

 terolaterally, not bearing short bosses cut 

 by transverse suture S. disdorsalis 



lib. Dorsomedian carina on first abdominal 

 somite produced in tooth smaller or only 

 slightly larger than posterior tooth on 

 carapace, that of fifth sloping gradually to 

 posterior end; petasma with distal projec- 

 tions of dorsolateral lobules divergent and 

 produced in short filament; thelycum with 

 posterior component of median plate bear- 

 ing paired short lateral bosses cut by 

 transverse suture S. ingentis 



Sicyonia laevigata Stimpson 1871 

 Figures 8-12 



Sicyonia laevigata Stimpson 1871: 131 [type not 

 extant; type-locality: Charleston, S.C.]. 

 Kingsley 1878:69, 1880:426. Rathbun 1901: 

 103 [part]. De Man 1911:11. Bouvier 1918:6. 



Hay and Shore 1918:379, pi. 25, fig. 1. Rath- 

 bun 1920:319. Burkenroad 1945:5. Lunz 

 1945:4, fig. 1. Pearse and Williams 1951: 

 143. Wass 1955:142. Menzel 1956:41. Hut- 

 ton et al. 1959:6. Wells 1961:248. Williams 

 1965:33. Fausto Filho 1966a:32, 1966b:47, 

 fig. 8. Eldred et al. 1965:32. Joyce and El- 

 dred 1966:24. Fausto Filho 1968:73. Rouse 

 1969:136. Bayer et al. 1970:41. Lyons et 

 al. 1971:28. Garcia Pinto 1971:5. Chace 

 1972:11. Camp et al. 1977:23. Rodriguez 

 de la Cruz 1977:11. Huff and Cobb 1979:67, 

 fig. 38a-d. Rodriguez 1980:70. Perez 

 Farfante 1980:773. Greening and Living- 

 ston 1982:151. Coen and Heck 1983:206. 

 Williams 1984:47. 



Sicyonia sculpta var. americana De Man 1907:450. 



Sicyonia carinata De Man 1907:451. [Not Cancer 

 carinatus Briinnich 1768 = Sicyonia carinata.] 



Sicyonia carinata var. americana De Man 1911:10. 



Eusicyonia laevigata. Burkenroad 1934a:76, fig. 

 21, 26, 32, 1934b:117. Schmitt 1935:132. 

 Burkenroad 1938:80. Lunz 1945:4, fig. 1. 



Sicyonia carinata americana. Burkenroad 

 1934a:76. 



Vernacular names: rock shrimp, hardback, coral 

 shrimp (United States); camaron de piedra, 

 cacahuete (Mexico); camaron conchiduro 

 (Mexico, Panama); camarao-da-pedra (Brazil). 



Diagnosis. — Antennal spine absent or barely dis- 

 tinct and lacking buttress. Second abdominal so- 

 mite with perpendicular incision on dorsomedian 

 carina. First pereopod armed with short spine on 

 basis and ischium. Postrostral carina bearing 

 three unequal teeth, epigastric one considerably 

 smaller than posterior two teeth. Anteromedian 

 sulcus of first abdominal somite, if distinct, short, 

 ending well above margin of pleuron; posteroven- 

 tral extremity of fourth abdominal somite not dis- 

 tinctly angular. Petasma with distal projection of 

 dorsolateral lobule almost straight but with apical 

 part curved dorsally. Thelycum with plate of ster- 

 nite XIV produced in elongate anterolateral 

 lobules, their anteromesial borders strongly di- 

 vergent. 



Description. — Body moderately robust (Fig. 8) 

 and lacking tubercles. Carapace with patches of 

 short setae on dorsum, as well as ventral and an- 

 terior to posterodorsal part of branchiocardiac 

 carina; extremely long setae flanking base of, and 

 between, teeth of postrostral carina. 



Rostrum long, reaching as far as distal end of 



11 



