Arenopontia australis

(3) australis -group Diagnosis. Anal somite without paired dorsolateral processes. Anal operculum weakly developed, without rounded medial extension. P1 exp-1 with outer spine; exp-3 with four setae/spines. P1 enp-2 with outer spine and inner geniculate seta distally. P2 exp-2 with outer spine of normal length (not extending far beyond distal margin of exp-3). P2 endopod 2-segmented; enp-2 with inner seta and two distal spines. P3 endopod 1-segmented; with one distal spine. P4 enp-2 with normally developed outer seta. Species included. N. australis (Chappuis, 1953). This species group includes one incompletely described African species which does not fit comfortably in either the spinicaudatus - or trisetosus -groups defined herein. The reduced armature on the P3 endopod (one apical element on the distal segment) is not exclusive to N. australis (Table 2). More information is required before any statement can be made about its relationships, particularly whether it may be nested as an advanced member in the spinicaudatus -group.