PEREZ FARFANTE: ROCK SHRIMP GENUS SICYONIA 



reliable. The names of the countries cited are in 

 English as are the Gulf of California and the Gulf 

 of Mexico; otherwise, all geographic features and 

 localities are in the language of the country in 

 which they occur 



Material examined during this study are in the 

 collections of the following institutions. 



AHF Allan Hancock Foundation, Los An- 



geles, California, USA 



AMNH American Museum of Natural His- 

 tory, New York, New York, USA 



CAS California Academy of Sciences, San 



Francisco, California, USA 



IMARPE Instituto del Mar del Peru, Callao, 

 Peru 



INP Instituto Nacional de Pesca, Sec- 



retaria de Pesca, Mexico D.F., 

 Mexico 



MCZ Museum of Comparative Zoology, 



Harvard University, Cambridge, 

 Massachusetts, USA 



MP Museum National d'Histoire Natu- 



relle, Paris, France 



SIO Scripps Institution of Oceanography, 



La Jolla, California, USA 



UCR Universidad de Costa Rica, San Jose, 



Costa Rica 



UP Universidad de Panama, Panama 



USNM National Museum of Natural History, 



Smithsonian Institution, Washing- 

 ton, D.C., USA 



YPM Peabody Museum of Natural History, 



Yale University, New Haven, Con- 

 necticut, USA 



ZMB Zoologisches Museum der Hum- 



boldt-Universitat, Berlin, East 

 Germany. 



Genus Sicyonia H. Milne Edwards 1830 



Sicyonia H. Milne Edwards 1830:339 [type- 

 species, by monotypy: Sicyonia sculpta H. Milne 

 Edwards 1830:340 (= Cancer carinatus Brian- 

 nich 1768:102)]. H. Milne Edwards 1837:408. 

 De Haan 1849:187. Heller 1863:290. Bate 

 1888:292. A. Milne Edwards and Bouvier 

 1909:243. Balss 1914:14. Burkenroad 1945:1. 

 Barnard 1950:635. Holthuis 1952:339. 



Hall 1956:87. Zariquiey Alvarez 1968:57. 

 [Name validated and placed on the Official 

 List of Generic Names in Zoology as Name No. 

 922 under Plenary Powers of the International 



Commission on Zoological Nomenclature, Opin- 

 ion 382, 1956:45; Hemming 1958:126.] Gender: 

 feminine. 



Ruvulus de Natale 1850:20 (published as synonym 

 of Sicyonia H. Milne Edwards 1830) [type- 

 species, by monotypy for Sicyonia H. Milne Ed- 

 wards: Sicyonia sculpta H. Milne Edwards 

 1830]. Holthuis 1952:339. Hall 1956:87. 

 Gender: masculine. 



Synhimantites Boeck 1864:189 [type-species, by 

 monotypy: Synhimantites typicus Boeck 

 1864:189]. Burkenroad 1945:1. Holthuis 

 1952:339. Gender: masculine. 



Eusicyonia Stebbing 1914:25 (substitute name for 

 Sicyonia H. Milne Edwards 1830) [type-species, 

 by monotypy for Sicyonia H. Milne Edwards 

 1830: Sicyonia sculpta H. Milne Edwards 1830]. 

 Balss 1925:232. Burkenroad 1934a:70, 



1934b:116, 1945:1. Kubo 1949:437. Holthuis 

 1952:339. Hall 1956:87. Gender: feminine. 



Diagnosis. — Body with integument rigid, micro- 

 scopically setose-punctate. Rostrum short, not 

 overreaching distal margin of antennular pedun- 

 cle, more often falling short of it, and armed with 

 dorsal, and usually apical teeth, lacking ventral 

 ones (Fig. 1). Carapace with postrostral carina 

 bearing epigastric tooth and variable number of 

 teeth more posteriorly; orbital, postorbital, and 

 pterygostomian spines lacking; antennal spine 

 present or absent; hepatic spine well developed; 

 cervical sulcus indistinct; hepatic sulcus usually 

 shallow; hepatic carina weak or indistinct; bran- 

 chiocardiac carina strong to barely distinct (Fig. 

 2). Abdomen marked by transverse sulci bordered 

 by closely set setae; dorsomedian carina extending 

 for entire length; carina on first somite usually 

 produced in large anterior tooth, that on second 

 incised or entire, and that on sixth terminating in 

 strong tooth; sixth somite bearing cicatrix. Telson 

 armed with pair of marginal, fixed, subterminal 

 spines. Optic calathus articulated directly to basal 

 article of eyestalk, intermediate article [ = Young's 

 (1959) optic stalk] not apparent; ocular stylet pro- 

 jecting from anterolateral margin of ocular plate 

 (Fig. 3). Antennular peduncle about 0.6 cl; pro- 

 sartema (Fig. 4F-p) rudimentary; stylocerite long, 

 produced as sharp spine; antennular flagella 

 short, not exceeding 0.5 cl, mesial flagellum taper- 

 ing gradually from base, lateral one broad from 

 base to near tip, then tapering rapidly to apex. 

 Mandibular palp (Fig. 4A ) three-jointed, proximal 

 article small and short, distal article large, much 

 larger than penultimate one, and roughly 



