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1.         Ninth abdominal segment with a ventral operculum closing a caudal chamber containing 3 tufts             of retratile filamentous gills; without gills on other part of abdomen; expanded lateral portions             of adominal segments separated. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

            Ninth abdominal segmetn without ventral operculum; with pairs of ventral tufts of filamentous             gills on 4-5 abdominal segments; expanded lateral portions of abdominal segments fitting             tightly together at margin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Psephenus herricki

2.         Apex of 9th abdominal segment with a distinct median notch. Dicranopselaphus veriegatus

           Apex of 9th abdominal segment truncate, without a median notch. . . . . . . . . . . . Ectopria sp.

 

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