CAPRELLIDAE OF WESTERN NORTH ATLANTIC 



53 



Dcutella Mayer, 1890 



Flagellum of antenna 2 biarticulate, swimming setae absent; 

 mandibular palp 3-segmented, setal formula for terminal article 

 1-x-l, 1, or 2, molar present; outer lobe of maxilliped larger than 

 inner lobe; gills on pereonitcs 3 and 4 ; pereopods 3 and 4, 2-segmented, 

 pereopod 5, 6-scgmented, inserted at the posterior of pereonite 5; 

 abdomen of male with pair of appendages and pair of setose lobes, 

 female with pair of lobes, with or without setae. 



Type-species: Deutella californica Mayer, 1890 (by monotypy, 

 subsequently designated by Dougherty and Steinberg, 1953). 



Remarks.— The genus Deutella is presently composed of 4 species; 

 D. californica Mayer, 1890; D. incerta (Mayer, 1903); D. mayeri 

 Stebbing, 1895; and D. venenosa Mayer, 1890. Steinberg and 

 Dougherty (1957) state they believe Luconacia incerta belongs 

 to Deutella because differences between the two genera seem minor. 

 The differences to which they refer are the lack of a definitive palmar 

 surface on the propodus of pereopod 5 and the presence of swimming 

 setae in Luconacia. There exist, however, several more important 

 differences which are presented in table 1. It can be seen that the 

 genus Luconacia difl'ers from Deutella except for the serrate lacmia 

 mobilis which D. mayeri shares with L. incerta. The remaining dif- 

 ferences seem sufTicient to separate Deutella and Luconacia; therefore, 

 the genus Luconacia has been reestablished. 



Deutella mayeri and D. sp. Mayer, 1890, differ from the other 

 species of the genus in having only 1 or 2 setae on the terminal ar- 

 ticle of the mandibular palp. D. mayeri exhibits many similarities 

 with the species of Paracaprella, particularly P. tenuis which some- 

 times bears a small 3-segmented palp with a terminal seta. D. mayeri 



