Cystowithius, Harvey, 2004

García, Fabián & Romero-Ortiz, Catalina, 2021, Cystowithius ankeri sp. nov. (Arachnida: Pseudoscorpiones: Withiidae), a new pseudoscorpion from the Central Andes of Colombia, Zoologia (e 21003) 38, pp. 1-8 : 7

Identification key to the five presently known species of Cystowithius , using mainly characters of the males (modified from Harvey 2004)

1. Chelal hand smooth; setae on chelal hand only barely denticulate; tactile setae of tarsus IV situated closer to its mid-length (TS = 0.59–0.61)......................... C. chamberlini

1’. Chelal hand evenly granulate; setae on chelal hand distinctly denticulate; tactile seta of tarsus IV situated subdistally (TS = 0.68–0.79) ................................................... 2

2. Movable finger of pedipalp more than 0.70 mm; males with sternal invaginations on sternites VI–VIII................. ................................................................. C. ankeri sp. nov.

2’. Movable finger of pedipalp less than 0.60 mm; males with sternal invaginations on sternites V–VIII or VI–VII ........ 3

3. Pedipalps longer and more slender, i.e. chela (with pedicel) longer than 1.35 mm ................................ C. smithersi

3’. Pedipalps shorter and more robust, i.e. chela (with pedicel) shorter than 1.20 mm ............................................... 4

4. Setae on tergite XI short and strongly clavate; chelal hand without long, strongly denticulate setae ........................... ....................................................................... C. colombicus

4’. Setae on tergite XI long and only slightly clavate; chelal hand with long, strongly denticulate setae ....................... ...................................................................... C. ecuadoricus