FISHERY BULLETIN: VOL. 83, NO. 1 



Anonymous 1980:7. Brusca 1980:256. 



Sosa Hernandez et al. 1980:12. Mendez G. 

 1981:47, pi. 9, fig. 78-82. Perez Farfante and 

 Booths 1981:424. Perez Farfante 1982:370. 



Vernacular names: rock shrimp, target shrimp, 

 Japanese shrimp (United States); camaron de 

 piedra, camaron de roca, camaron japones, 

 cacahuete (Mexico); camaron conchiduro 

 (Mexico, Panama); camaron de mar, camaron 

 cascaradura (Peru). FAO names: hardhusk 

 rock shrimp (English); camaron cascara dura 

 (Spanish); boucot noisette (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 raised in high crest behind pos- 

 terior tooth. Rostrum short, not overreaching dis- 

 tal margin of eye. Abdomen tuberculate; second 

 and third somites not bearing special inverted 

 V-shaped ridges laterally; fifth somite with dor- 

 somedian carina ending in sharp angle or tooth 

 posteriorly. Petasma with distal projection of dor- 

 solateral lobule compressed distally, its truncate 

 tip produced dorsally in simple, minute spine. 

 Thelycum with plate of sternite XIV lacking an- 

 teromedian tubercle and either flat or barely 



raised in ill-defined bulges. Branchiostegite bear- 

 ing large, horizontally disposed 9-shaped color 

 pattern. 



Description. — Body relatively short (Fig. 39). 

 Carapace with irregular patches of longer setae on 

 dorsum, in depression delimiting branchiocardiac 

 carina posterodorsally, and on areas anterior to 

 hepatic spine and ventral to hepatic sulcus; one 

 patch also present in dorsolateral depression of 

 sixth abdominal somite. Abdomen rather heavily 

 granulate on first three abdominal somites, usu- 

 ally slightly so on last somites. 



Rostrum short, not overreaching distal margin 

 of eye, its length increasing linearly with carapace 

 length (Fig. 40) to about 16 mm cl, then increasing 

 little, not surpassing 6 mm (proportional length 

 decreasing with increasing size from as much as 

 0.43 to as little as 0.20 cl); subhorizontal or up- 

 turned to 30° in males and to 50° in females; armed 

 with two dorsal teeth and three (occasionally two) 

 apical ones, latter disposed on obliquely truncate 

 apex, upper tooth posterior to level of ventral one 

 (occasionally appearing to be third of dorsal 

 series); first dorsal tooth subequal to or, more often 

 slightly smaller than, epigastric and situated op- 

 posite or immediately anterior to orbital margin; 

 second tooth variably placed between anterior 0.17 

 and 0.40 (mean 0.30) rl. Conspicuous adrostral 

 carina, subparallel and near ventral margin, ex- 



FlGURE 39. — Sicyonia aliaffinis (Burkenroad 1934), 9 26 mm cl, west of Puerto Madero, Golfo de Tehuantepec, Mexico. Lateral 



view. Scale = 5 mm. 



48 



