Proceedings of 

 the United States 

 National Museum 



SMITHSONIAN INSTITUTION • WASHINGTON, D.C. 



Volume 112 1960 Number 3434 



NORTH AND SOUTH AMERICAN COPEPODS OF THE GENUS 

 HEMICYCLOPS (CYCLOPOIDA : CLAUSIDIIDAE) 



By Richard U. Gooding 1 



Introduction 



Species of the genus Hemicyclops Boeck have been found on both 

 east and west coasts of the American continents. Those previously 

 described are thysanotus Wilson, callianassae Wilson, pugettensis Light 

 and Hartman, purpureas Boeck, adhaerens (Williams), americanus 

 Wilson and elongatus Wilson; subadhaerens and arenicolae are added 

 in this review. Little is known about their ecology or distribution, but 

 all appear to be intertidal forms or inhabitants of shallow water and 

 some to live in association with other animals. To the latter 

 category belong at least one and possibly both of the new forms 

 described. 



This study forms the first part of a revision of the genus Hemi- 

 cyclops. An attempt on the larger task has seemed inappropriate at 

 present for two reasons. First, lack of information on the morphology 

 of larval stages in the Clausidiidae (to which all the genera mentioned 

 in this paragraph belong) prevents an adequate evaluation of Nicholls' 

 suggestion (1944, pp. 49-51) that the genus Saphirella T. Scott repre- 

 sents "the young form of Hemicyclops." Second, although some 

 trends shown by the species described in this paper suggest that the 



1 Zoology Department, University of Washington, Seattle. 



159 



