﻿PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



issued s^ik S gII^H ^ff '^^ 



SMITHSONIAN INSTITUTION 

 U. S. NATIONAL MUSEUM 



Vol. 100 Washington: 1949 No. 3258 



FRESH-WATER OSTRACODA FROM BRAZIL 



By Willis L. Tressler 



Very little is known of the ostracod fauna of Brazil, and still less 

 work has been done on the Ostracoda of the region around Sao Paulo. 

 Sars (1901) reported on several species from this latter region; Daday 

 (1911) described a new species of Cypris from Brazil; more recently 

 Klie has published several papers on the ostracods of northeastern 

 Brazil (1939, 1940); and I have in preparation a publication on some 

 ostracods from the region of Santarem, in northern Brazil. These 

 are the only publications on the Ostracoda of Brazil. 



A'lost of the forms reported on in the present paper are typically 

 American. The genera Chlamydotheca, Physocypria, and Strandesia 

 have not been foimd outside North or South America. Of the 22 

 species described several have been reported previously from South 

 America. Chlamydotheca incisa is known from Argentina, Strandesia 

 bicuspis bicuspis from Argentina, Paraguay, and Brazil, and Cypretta 

 costata from Brazil as weU as Aladagascar. The well-known forms 

 Chlamydotheca unispinosa and Stenocypris malcolmsoni are widely 

 distributed. The former is known from Brazil (Pernambuco) , the 

 Hawaiian Islands, Jamaica, Yucatan, Illinois, Ohio, Louisiana, and 

 Maryland, while the latter has been reported from such widely sepa- 

 rated regions as India, Ceylon, Australia, Celebes, Sumatra, East 

 Africa, Yucatdii, the Philippines, and Hawaii. Chlamydotheca arcuata 

 is known from Ohio, Florida, Mexico, and Brazil (Itatiba). Cypri- 

 cercus episphaena was known only from South Africa previous to this 

 report. Two forms, Physocypria crenulata and Cyprinotus ovatus, 

 were known previously only from Sumatra. The striking genus 

 Pelocypris, with its one known species, P. lenzi, has been reported only 



> A contribution from the Zoology Department of the University of Maryland. 



839191—50 1 61 



