COPEPODA FROM IFALUK ATOLL 39 



Genus Euryte Philippi, 1843 



Type species: Eunjte longicauda Philippi, 1843. 



Sewell (1949, p. 35, fig. 4) described a female Euryte as Euryte 

 spec, characterized by 18-segmented antenniiles and the structure 

 of the mandibular palp, composed of a smaU knob bearing 1 seta. 

 So far as the meager details given in Sewell's description allow it to 

 be stated, the species is a typical Euryte, the aberrant structure of the 

 mandibular palp being the result of damage during dissection (SeweU 

 saw only one specimen). The various species of Euryte are listed 

 below: 



Females Males 



E. longicauda Philippi, 1843 E. longicauda Philippi, 1843 



E. longicauda var. minor T. Scott, E. longicauda var. minor T. Scott, 



1905a 190oa 



E. rohusta Giesbrecht, 1900 E. robusta Giesbrecht, 1900 



E. similis T. Scott, 1912 

 E. curticornis G. O. Sars, 1913 

 E. brevicauda Sewell, 1949 

 E. spec, Sewell, 1949 

 E. pseudorobusta, new species E. pseudorobusta, new species 



Euryte longicauda var. minor T. Scott, 1905a (p. 143, pi. 10, figs. 

 13, 14) really represents a variety of E. longicauda, generally found 

 in deeper waters; its structural differences with the typical form are 

 so insignificant that it certainly cannot be maintained at a specific 

 level. 



Males and females of Euryte can be distinguished with the follow- 

 ing key: 



1. Furcal rami 7-8 times as long as wide E. longicauda Philippi 



Furcal rami 2-4 times as long as wide 2 



2. Furcal rami 3-4 times as long as wide 3 



Furcal rami twice as long as wide or shorter 5 



3. Median apical spine on 3rd endopodal segment of leg 4 short and broadly- 



ovate, shorter even than (compact) 3rd endopodal segment. All feet with 

 short and broad segments; spines with broad lamellar edges, short, c?" 

 with short, thick, curved seta on the anterior aspect of thick, median (13th) 



antennular segment E. robusta Giesbrecht 



Median apical spine on 3rd endopodal segment of leg 4 longer than slender 

 3rd segment. Feet normally developed; spines with slender, elongated 

 ovate, lamellar edges, cf unknown 4 



4. Median apical spine on 3rd endopodal segment of leg 4, 1]^ times as long as 



3rd segment. Terminal segment of endopodite maxillipede short, claws on 



this segment short, of equal length E. curticornis G. O. Sars 



Median apical spine on 3rd endopodal segment of leg 4 only slightly longer 

 than 3rd segment. Terminal claws on endopodite maxillipede unequal, 

 terminal segment elongate E. similis T. Scott 



646-471—64 4 



