Acarothrix Bartsch, 1990

Bartsch, Ilse, 2015, The genital area of Halacaridae (Acari), life stages and development of morphological characters and implication on the classification, Zootaxa 3919 (2), pp. 201-259 : 207

Acarothrix Bartsch, 1990

Type species. Acarothrix palustris Bartsch, 1990 .

Adults. GP and AP in female and male fused; GO in about middle of GA. Female GA with three pairs of pgs; genital sclerites with pair of sgs; single pair of gac in internal position just posterior to middle of GO ( Bartsch 2006a: figs 2, 18). Ovipositor at rest slightly extending beyond GO. Most of apical genital spines short, distinctly sclerotized, partly bifid. In ventral aspect, when ovipositor at rest, two pairs of anterior apical genital spines seen. There may be another seven spines, but as obscured, exact number not known. Male GO slightly smaller than that of female. Male GA with about 9–14 pairs of slender pgs; genital sclerites with four pairs of sgs, two setiform anterior pairs and a spiniform and setiform posterior pair. Pair of acetabula external, situated in posterior part of genital sclerites ( Bartsch 1990a: figs 4, 5, 2004c: fig. 2D, 2006a: fig 12). AE with pair of epimeral pores.

Juveniles. With a larval and a single nymphal stage. In protonymph GP separated from AP. GP with single pair of small internal gac; pgs and sgs lacking. Shape of larval epimeral pores same as in adults and protonymph.

Remarks. The five species to date known are spread world-wide, all records are from warm-temperate and tropical brackish waters ( Bartsch 2009a; Chatterjee et al. 2012, 2013).