Proceedings of 

 the United States 

 National Museum ^^gt^ 



SMITHSONIAN INSTITUTION • WASHINGTON, D.C. 



Volume 123 1967 Number 3613 



Two New Crustaceans: The Parasitic Copepod 



Sphaeronellopsis monothrix (Choniostomatidae) 



And its Myodocopid Ostracod Host 



Parasterope pollex (Cylindroleberidae) 



From the Southern New England Coast 



By Thomas E. Bowman and Louis S. Kornicker 

 Associate Curators, Division of Crustacea 



The parasitic copepods of the family Choniostomatidae have re- 

 ceived little attention since the classic monograph of Hansen (1897). 

 This neglect is probably attributable to the fact that the majority of 

 them inhabit the marsupia of other crustaceans, mostly Peracarida, 

 where they easily are mistaken for the eggs of the hosts and therefore 

 are overlooked. The abundance of the new choniostomatid consid- 

 ered in this paper suggests that these copepods are more common 

 than generally is realized. 



The new choniostomatid described herein, Sphaeronellopsis mono- 

 thrix, was discovered by Kornicker during a study of a new species of 

 ostracod, Parasterope pollex, from Hadley Harbor, near Woods Hole, 

 Mass. The description of P. pollex has been prepared by Kornicker 

 alone, while that of S. monothrix is the work of both authors. 



The material available has been sufficient to enable us to give some 

 details of the biology of S. monothrix and its relations with the host. 

 Following this account are formal taxonomic descriptions of both 

 species. 



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248-330—67 



