Genus Stigmaeus Koch, 1836

Type species

Stigmaeus cruentus Koch, 1836, by original designation.

Description

The genus Stigmaeus Koch, 1836 ( Acari: Stigmaeidae) can be defined by the following characters: idiosoma oval; chelicerae separate; palptibial claw subequal to or slightly shorter than palptarsus; accessory claw seta-like or spine-like, terminal eupathidion on palptarsus basally fused and split into two or three long prongs; counts of setae and solenidia from palptrochanter to palptarsus: 0, 3, 1–2, 2 + 1 claw + 1 accessory claw, 4 + 1ω + 1 subterminal spine-like eupathidion + 2 or 3 eupathidia (basally fused); subcapitulum with two pairs of subcapitular setae; prodorsum typically with a large shield, bearing three pairs of setae and a pair of platelets bearing setae sce; eyes present or absent, postocular bodies (pob) present or absent; dorsal hysterosomal area typically with one or two shields surrounded by three to five pairs of platelets, setae d 1 and d 2 never on same shield; humeral shields dorso- or ventrolateral, with setae c 2; intercalary shields entire or divided, with a pair of setae (f 1); suranal shield entire or divided, with two or three pairs of setae; coxisternal shields present, divided along midline; ventral opisthosoma with three to five pairs of aggenital setae; genital and anal valves fused or contiguous, with one to three pairs of genital setae and three pairs of pseudanal setae (Fan & Zhang 2005; Dönel & Doğan 2011; Doğan et al. 2015a, 2016).