Amphialycus (Amphialycus) acaciae sp. nov. (Figs. 29–47) Description. Dorsum (Figs. 29–31). Length 480 μm; dorsal setal pattern holotrichous, additional setae of smaller size on ventral side; parallel ridges contiguous on soft integument; sclerotic crista from naso to sensillar area, distance between counterparts of setae vi twice as large than the distance between sensilla ve or setae in, microplates of setae vi inseparably linked to crista, striated naso tapering to blunt end, setae exp very small, sparsely barbed, medial to anterior pair of lateral eye spots. Venter (Figs. 32, 33). Genital valves each with 21–22 genital setae; 8–9 anal setae per valve. Gnathosoma (Figs. 34–36). Pair of smooth cheliceral setae almost dorsally, seta placed slightly abaxially as in Fig. 29; 2 pairs of adoral setae; four microtrichous palpal eupathids, separate from each other. Legs (Figs. 37–42). Solenidial formula for tarsi, tibiae, genua and femora on legs I, II, III and IV, respectively: 2-1-0-0, 2-2-2-0, 3-2-2-1, 2-0-0-0, solenidion ω2 at the adaxial end of lyrifissure, famuli I and II ventrodistally. Larva (n=5, Figs. 46, 47) Dorsum. Length 180 μm; holotrichous dorsum; sensillae slender. Venter. Genital valves absent; 4 anal setae per valve. Gnathosoma. Subcapitulum with 2 pairs of setae. Legs. Solenidial formula for tarsi, tibiae, genua and femora on legs I, II and III, respectively: 1-1-0, 2-2-2, 3- 2-2, 1-0-0. Other life stages: Protonymph (n=6, Fig. 45), 1 genital seta per valve. Deutonymph (n=3, Fig. 44), 5–7 genital setae per valve. Tritonymph (n=6, Fig. 43), 13–14 genital setae per valve. Adult female (n=6, Figs. 32, 33), 21–22 genital setae per valve, one pair of eugenital setae. Type material. Holotype female, 5 paratype females, 6 paratype tritonymphs, 3 paratype deutonymphs, 6 paratype protonymphs and 5 paratype larvae, from Acacia karroo, Potchefstroom, NORTH-WEST PROVINCE, 6 February to March 1969, P.D. Theron. Deposited at ARC-Plant Health and Protection, Pretoria, South Africa. Additional material. 16 females, 12 tritonymphs, 7 protonymphs and 2 larvae from Acacia karroo, Potchefstroom, NORTH-WEST PROVINCE, 6 February to March 1969, P.D. Theron. Differential diagnosis. This species can easily be differentiated from another holotrichous species, A. mayteni, and from the neotrichous species of the genus by having a cone-like, striated naso (Figs. 30, 31), two pairs of welldeveloped adoral setae (Fig. 36) and solenidial formula. Etymology. The specific name refers to the previous genus of the dominant tree at the collection site, namely, Acacia.

Published as part of Uusitalo, Matti, Ueckermann, Edward A. & Theron, Pieter D., 2020, A review of the family Alycidae (Acari, Acariformes) from South Africa, pp. 301-340 in Zootaxa 4858 (3) on pages 311-315, DOI: 10.11646/zootaxa.4858.3.1, http://zenodo.org/record/4412321