Microcyclops mediasetosus Dussart & Frutos, 1985

Microcyclops mediasetosus Dussart & Frutos, 1985 View in CoL

Fig. 34 View Figure 34 Diagnosis. Adult female, 1,180 µm in length excluding caudal setae. Caudal ramus 2-2.5 times longer than wide; small spinules at the insertion of the lateral seta and at the insertion of the terminal outer spine ( Fig. 34A, D View Figure 34 ). Last P1-endopod segment has three pores on the surface in anterior view, and large spinules gradually increasing in length close to the insertion of the apical spine ( Fig. 34B, View Figure 34

C). Prosomites 4 and 5 has very finely serrate membranes. Seminal receptacle divided into two sections, one above and one below the ovigerous ducts; it has lateral projections that slightly taper distally. P5 apical seta 3 times longer than the segment in which it is inserted.

Remarks. The illustrated specimen was found in the lower stretch of the Paraná River, where it is commonly found near the banks of macrophytes. It can be easily identified by the lack of ornamentations on the second prosomites margins (excluding M. anceps ) or fouth prosomite plus first urosomite (excluding M. finitimus ) and the presence of three pores on the last segment of the P1-endopod.