Genus Neocarus Chamberlin and Mulaik, 1942

All specimens examined in this study are assigned to the genus Neocarus Chamberlin and Mulaik, 1942 . Generic assignment is based on the following characteristics. In the adults 3 setae on the penultimate body segment (0 or> 3 in all Old World taxa and Amazonacarus Vázquez et al., 2014; shared with Caribeacarus Vázquez and Klompen, 2009 and Brasilacarus Vázquez et al., 2015), 4–6 foliate setae on the palp tarsus (> 7 in Caribeacarus and Brasilacarus), eupathidium zeta–1 (ζ1, the sensillum with a “crown-like” tip) in the main sensillar group of tarsus I (usually distal in Caribeacarus), and shiny fleshy setae with a whip-like tip absent from the palps (present in Brasilacarus).

Within Neocarus the Argentinean specimens share a few characteristics suggesting that they may be related: palp tarsus in adults carries 6 large, foliate sensilla with 4 prominent lobes (usually 3 lobes) and both pairs of genital glands in the males are distinct, large, and similar in size (generally indistinct in cleared specimens, or anterior pair much smaller than posterior).