Figure 69. — Penaeus (M.) brasi- 

 liensis Lat. Cephalothorax, $ 43 

 mm. C.I., off Itafmas, Esplrito 

 Santo, Brazil. 



APPENDIX MASCULINA (fig. 75 d) 



Relatively broad, its length I1/5 to li^ maximum 

 width, lateral margin with short spines reaching 

 apex, median margin with long spines (almost half 

 length of appendix) on distal half. Anterior sur- 

 face slightly concave, posterior surface concave, 

 with sharp longitudinal ridge projecting from 

 median margin. 



THELYCUM (fig. 76 a-c) 



Anterior process typically small, projecting ven- 

 trally in subtriangular ridge, enclosed surface 

 slightly to deeply concave. Posterior process rather 

 weakly developed, often (not always) with short 

 median carina situated deeply between horns of 

 median protuberance, delimited by narrow sulcus 

 on each side. Lateral plates with anteromedian 

 corners extended anteriorly forming projections 

 meeting along midline, and reaching base of an- 

 terior process, thus covering posterior process. 

 Pi-ojections pointed or rounded anteriorly; if 

 rounded, overlapping. 



COLOR 



The range of colors varies considerably. The 

 usual pink or brownish-red specimens are desig- 

 nated camarao rosa in Brazil, and langostino or 

 camaron rosado in Venezuela, both meaning 

 pink shrimp. Yellow individuals, also common, 

 are called camaron amarillo (yellow shrimp) 

 and brown ones arc not infrequent. The yomig 

 are usually brownish and are called camarao lixo 

 (dirty shrimp) in Brazil. P. brasiliensis usually 

 possesses a roundish, dark reddish-bro^vn spot on 

 each side at the jimcture of third and fourth ab- 

 dominal somites, similar to that in P. d. duorammi 

 and P. d. notialls. Davant (1963) and Holthuis 

 (1959) pointed out that individuals of P. brasi- 

 liensis from Venezuela and Surinam-French 

 Guiana, respectively, always seem to have the two 

 spots, but that P. a. subtilw and P. d. notiaUs lack 

 them. The two spots were also observed in individ- 

 uals from Baia de Guanabara, Brazil, by da Silva 

 (1965). 



Distribution and Morphological Variations 



P. hmsUiensis ranges from off Cajse Hatteras 

 soutli to the Florida Keys and, although rarely, 

 reaches the Tortugas grounds. It also ranges from 

 the Bermudas through the Bahamas and Antilles 

 and along the Atlantic Coast of South America, to 

 Rio Grande-Lagoa dos Patos, Brazil. It also occurs 



568 



U.S. FISH AND WILDLIFE SERVICE 



