Proceedings of 

 the United States 

 National Museum 



Bt> 



SMITHSONIAN INSTITUTION • WASHINGTON, D.C. 



Volume 124 1967 Number 3628 



Cyclopoid Copepods of the Genus Paranthessius 

 Associated with Marine Pelecypods in Chile 



By Arthur G. Humes * 



Records of the genus Paranthessius from the western coast of North 

 and South America are relatively scarce. Thompson (1897, p. 87) 

 in Herdman, Thompson, and A. Scott, described Pseudolichomolgus 

 columbiae (= Paranthessius columbiae according to Illg, 1949) from a 

 single planktonic specimen in Puget Sound, Washington. Illg (1949) 

 reported five species of Paranthessius from various pelecypods in 

 California: P. columbiae (Thompson, 1897) from Schizothaerus nuttalli 

 (Conrad) and Protothaca tenerrima (Carpenter) , and four new species, 

 P. panopeae from Panope generosa Gould, P. tivelae from Tivela 

 stultorum (Mawe), and P. saxidomi and P. perplexus from Saxidomus 

 nuttalli Conrad. 



On Cruise 18 of the R/V Anton Bruun, during the Southeastern 

 Pacific Biological Oceanographic Program of the National Science 

 Foundation, the ship visited Valparaiso and Iquique, Chile, where 

 the author collected specimens of the two new copepods described 

 below from pelecypods purchased in the local fish markets. The first 

 of the new species is the second record of Paranthessius from the genus 

 Protothaca and the second represents the first record from Mesodesma. 



1 Department of Biology, Boston University, Boston, Mass. 



