Limnohalacarinae Viets, 1927

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 : 245

Limnohalacarinae Viets, 1927

Adults. Dorsum with AD, PD, pair of OC, four to five pairs of distinct gland pores and three to six pairs of short idiosomatic setae, pair of ds-6 on anal cone. AE, PE and GP present, may be fused to a ventral shield. PE with two to three long setae. In female genital and anal plate separated; in male plates generally fused. Genital acetabula external, all on GP, either along lateral margins or in posterior part of GP. Females with three to ten pairs of pgs, males with a larger number, arranged either close to or scatteredly around GO. Female genital sclerites with zero to five pairs of sgs, males with three pairs. Palps four-segmented, attached dorsally, P-2 with two either equal or differently sized dorsal setae (or a single (?) apical seta), P-3 with large ventral spine; P-4 basally with three setae, apically with spine and setae. Rostrum conical or elongate; apical pair of maxillary setae in about middle of rostrum, basal pair near rostral basis. Genua I and II shorter than these legs' telofemora and tibiae. Tibiae ventrally with smooth and slender or coarsely bipectinate and wide setae. Solenidion on tarsus I and II in dorsolateral position. Tarsi I to IV with 4, 4, 4, 3 dorsal and 1, 0, 0, 0 ventral setae. Arrangement and size of tines on claw I different from those on claws of following tarsi, tines of claws I rarely more delicate, often much larger than tines of the other claws. Central sclerite without distinct median claw.

Juveniles. Protonymph with one to three pairs of gac; pgs and sgs absent. Second nymphal stage with pairs of gac, pgs, sgs numbering 2–8, 2–6, 0–2, respectively.

Remarks. The subfamily includes the freshwater genera Hamohalacarus , Himejacarus , Limnohalacarus , Soldanellonyx , and Stygohalacarus but excludes Parasoldanellonyx . In this genus the solenidion on tarsus II is in a dorsomedial position.