Alona affinis (Leydig, 1860)

Dartnall, Herbert J. G. & Hollwedel, Werner, 2007, A limnological reconnaissance of the Falkland Islands; with particular reference to the waterfleas (Arthropoda: Anomopoda), Journal of Natural History 41 (21 - 24), pp. 1259-1300 : 1266

Alona affinis (Leydig, 1860)

Several characteristics agree with the known morphology of the species: namely size 0.8 mm, valve height maximal in the middle; ocellus smaller than eye, labium with convex anterior margin; post-abdomen ( Figure 8 ) broad, distally rounded, with 14–15 anal denticles, basal spine of post-abdominal claw with setae on concave margin. The position of the two main head pores clearly distinguishes A. affinis from the similar A. quadrangularis . This cosmopolitan species has recently been reported from the Falkland Islands ( Brooks et al. 2005).

Figures

Figure 8. Alona affinis, female, post-abdomen.