COPEPODA FROM IFAIAJK ATOLL 61 



Order Harpacticoida 



Suborder Polyarthra 



Family Canuellidae Lang, 1948 



Ifanella, new genus 



Diagnosis. — Female unknown; males with head and 1st thoracic 

 somite separate, rostrum big: a slightly curved, triangular plate vnih. 

 rounded apex. Genital apertiu-es covered by big plates with 2 setae 

 each. Abdomen not tapering, caudal rami widely separated, long, 

 slightly diverging, with 6 marginal setae and 1 appendicular seta each. 

 Antennules chirocerate, with strongly swollen 5th segment and 

 flattened 6th segment. Antennae with 6-segmented exopodite and 

 3-segmented endopodite. Epipodite of maxillule strongly reduced, 

 asetose. Basal endite of maxilla with strong, coalescent spine. 

 MaxUlipede short, coxa and basis small, endopodite short, 3-seg- 

 mented. Legs 1 to 4 with 3-segmented exopodites and endopodites, 

 endopodite of leg 2 modified. Setal formula: 



legl 

 leg 2 

 legs 

 leg 4 



Leg 5 greatly reduced, no more than produced part of ventral wall 

 of abdominal somite 1, with 4 setae. 



Type species: Ifanella chacei, new species. 



The generic name, Ifanella, has been composed from the first part 

 of the name of the type locality, Ifaluk, with the ending -nella. The 

 specific name chacei has been chosen as a dedication to Dr. Fenner A. 

 Chase, Curator, Division of Marine Invertebrates, U.S. National 

 Museum, Washington, D.C. 



The present genus plainly belongs in Lang's family Canuellidae, at 

 present comprising the genera Sunaristes Hesse, 1867 (type species 

 Sunaristes paguri Hesse, 1867), Canuella T. and A. Scott, 1893 (type 

 species Canuella perplexa T. and A. Scott, 1893), Brianola Monard, 

 1926b (type species Brianola Stebleri Monard, 1926), Canuellina 

 Gurney, 1927 (type species Canuellina insignis Gurney, 1927) and 

 Canuellopsis Lang, 1936 (type species Canuellopsis typica Lang, 

 1936). The new species could not be fitted into any of these genera 

 because of the structure of the oral appendages and the setation of the 

 legs. I have been obliged, therefore, to introduce a new genus for it, 

 though with considerable trepidation, since the female failed to turn 

 up in the collection. The setation, nevertheless, is so different from 



