Acomatacarus Ewing, 1942

Diagnosis

SIF = 6B-B-(2-8)-2(1)1(0)1(0)1.0(1)000; fsp = 6.6.6; fSt = 0.2; fCx = 2.1.1; Ip = 800– 1020. Cheliceral blade with ventral row of denticles and dorsal teeth; galeal setae branched; palpal claw with different number of prongs (from 2 to 8); palpal tarsus with 6 branched setae. Tracheae and stigmae present. Scutum nearly trapezoidal, with nasus and rounded posterior margin, 2AM, 2AL, and 2 PL setae, sensilla flagelliform, usually ciliated. Legs 6-segmented; leg claws often with 2 conspicuous onychotriches; parasubterminala barbed or absent; tarsala II with more or less expanded apex; 2 (sometimes 1) genualae I; genuala II and III present or absent; tibiala III present; tarsala III or mastitarsala III sometimes present.

Remarks

Acomatacarus differs from Odontacarus Ewing, 1929 by a single trait (palpal tarsus bearing 6 vs 7 branched setae) and is thus frequently regarded as a synonym of the latter (Fernandes & Kulkarni 2003).