Extenuipalpus, Reck, 1959

Beard, Jennifer J., Ueckermann, Edward A., Castro, Elizeu B. & Seeman, Owen D., 2024, A revision of the genus Extenuipalpus Reck, 1959 (Trombidiformes: Tetranychoidea: Tenuipalpidae), with description of a new species, Zootaxa 5417 (1), pp. 1-62 : 60

Key to species of Extenuipalpus (females)

1. Opisthonotal setae c1, d1, e1 minute; genu I–II with two setae (d absent), tibiae II with four setae (d absent), femur IV nude; mid-dorsum with reticulation................................................................... E. sagittus

– Opisthonotal setae c1, d1, e1 large; genu I–II with three setae, tibiae II with five setae, femur IV with two setae; mid-dorsum with folds or striae.................................................................................... 2

2. Prodorsal setae sc1 long, cylindrical, three–four times longer than setae sc2; mid-prodorsum with fine arching striae.............................................................................................. E. quadrisetosus

– Prodorsal setae sc1 short, obovate, one third length of setae sc2; mid-prodorsum with transverse folds................. 3

3. Coxal fields I–II smooth to finely striate; cuticle between setae d1–e1 smooth with few irregular folds; deutonymph with dorsal opisthonotal setae c3 orbicular, with femur II seta d broadly lanceolate................................. E. niekerkae

– Coxal fields I–II finely punctate; cuticle between setae d1–e1 rugose; deutonymph with opisthonotal setae c3 ovate, with femur II seta d orbicular....................................................................... E. situngu sp. nov.