Eucyclops neumani neumani (Pesta, 1927)

Eucyclops neumani neumani (Pesta, 1927) View in CoL

Figs 10 View Figure 10 , 11 View Figure 11

Diagnosis. Adult female, 1,340 µm in length excluding caudal setae. P5 inner seta shorter than the median and out- er setae ( Figs 10A View Figure 10 , 11B View Figure 11 ); genital double-somite with lateral projections beating tuffs of setules, divided horizontally and the lower part is wider than the upper part. ( Fig. 10A View Figure 10 ). Long caudal rami, 8 times longer than wide, spinules along the entire outer margin or only on the distal margin ( Figs 10A, B View Figure 10 , 11C, D View Figure 11 ). Dorsal row of spinules on each side of the anus at last urosomal segment ( Fig. 10C View Figure 10 ). P4 endopod terminal segment is 2 times longer than wide, outer terminal spine of this segment is 1.4 times longer than the inner spine ( Fig. 10D View Figure 10 ).

Remarks. A species with a wide geographic distribution in the Americas. It is often found in coastal regions, aquatic macrophytes and rivers, and it is seldom found in the plankton of reservoirs. Animals with a dark (black or brownish) color, usually with debris attached to the segments and appendages, due to their benthic habit. This species can be easily distinguished by the long caudal rami, compared to the other congeners. The subspecies Eucyclops neumani titicacae Kiefer, 1957 , recorded from Peru, Colombia and Venezuela, was raised to species rank by Fuentes-Reinés and Suárez-Morales (2013).