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-;•-, .-r.i»X | t~' ' -^^'---- .."-g"%^.:,v---jap:^- 



1mm 



I I 



FiGUEE 70. — Penweus (M.) brasiliensis Lat. a. Sixth abdominal somite, posterodorsal portion, 9 37 mm. c.l., off 

 Camocim, Brazil, b. Sixth abdominal somite, i»sterodorsal iwrtion, $ 39.5 mm. c.l., Little Bahama Bank. 



from the Isla Contoy along the Caribbean Coast 

 of Mexico, Central America, and South America 

 (fig. 77). It is absent from the Gulf of Mexico, 

 north of Tortugas-Florida Bay to the vicinity of 

 Cabo Catoche. Lindner (1957) indicated that it 



Figure 71. — Percentage nf di.>4ribution of keel-sulcus 

 (K/S) values in Pcnaviix ^^f.) hrasHicnsin Lat. from 

 the coast of South America. 



might be present in the coastal lakes of Uruguay. 

 This probably erroneous assumption was based on 

 the observation of specimens in the commercial 

 catches at Rio Grande do Sul (Milton J. Lindner, 

 personal communication) ; however, as implied 

 above, no specimens have been collected so far 

 south. 



P. hrasiliensis is generally very scarce in the 

 northernmost portion of its range. The record 

 from off Cape Hatteras given by Burkenroad 

 (1939) was the first positive evidence of the pres- 

 ence of the species, as restricted by him, in the 

 waters of the United States. Previous references 

 of the occurrence of P. i^usilienMS along the At- 

 lantic Coast of the United States were based on 

 collections of P. a. astecus and P. d. duorarmn. 

 which were previously identified as P. h7'asiliensis. 

 It may be that specimens of P. hrasiliensis were 

 represented in the collections. Eldred and Hutton 

 (1960) stated that the range of the species in- 

 cluded the Caribbean and Atlantic Coasts of 

 South America and indicated the possibility (prob- 

 ably based on Burkenroad's only record) that it 

 also occurs along the North American coast. El- 

 dred (1960) found P. hrasiliensis in Biscayne Bay, 

 Fla., and, thus, corroborated its presence in the 

 southeastern United States. Recently, Costello and 

 Allen (196i) collected this species in eastern 

 Florida Bay ; and Joyce ( 1965 ) recorded it from 

 northeast Florida. I have also examined speci- 

 mens from other localities in Florida, north 

 of Fort Pierce and oft" Key Largo (see Study Ma- 

 terial). The presence of this species in the Tor- 

 tugas is based on a single male specimen de- 

 posited in the Bureau of Commercial Fisheries 

 Biological Laboratory, Galveston, Tex. It was 

 taken in a commercial catch made at approxi- 



WESTERN ATLANTIC SHRIMPS OF GENUS PENABUS 



569 



