Pachygnathus nasutus,

Uusitalo, Matti, Ueckermann, Edward A. & Theron, Pieter D., 2020, A review of the family Alycidae (Acari, Acariformes) from South Africa, Zootaxa 4858 (3), pp. 301-340: 305-311

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Pachygnathus nasutus

sp. nov.

Pachygnathus nasutus  sp. nov.

( Figs. 16–28View FIGURES 16−22View FIGURES 23−28)

Description. Dorsum ( Figs. 16, 17View FIGURES 16−22). Length 400–420 μm; holotrichous number of setae per segment dorsally, ad- ditional setae of small size on ventral side, soft integument slightly undulating; sclerotic crista from naso to sensillar area, microplates of setae vi inseparably linked to crista, setae exp small, barbed, medial to anterior pair of lateral eye spots.

Venter ( Fig. 21View FIGURES 16−22). Genital valves each with 13–15 genital setae per valve; 4 anal setae per valve.

Gnathosoma  ( Figs. 18–20View FIGURES 16−22). Chelicera beak-like with a few minute teeth on both chelae, and without cheliceral setae; subcapitulum with three pairs of setae and one pair of smooth adoral setae; four sparsely barbed palpal eupathids, clearly separate from each other.

Legs ( Fig 22View FIGURES 16−22). 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\4-2-2-2, 3-0-0-0, solenidion ω2 well moved anteriorly from adaxial end of lyrifissure, famulus I peg-like distally, famulus II a tiny rod abaxially.

Larva (n=1, Figs. 27, 28View FIGURES 23−28)

Dorsum. Length 180 μm, holotrichous, sensillae ve and sci slightly swollen, setae longest on caudal segments.

Venter. Genital area absent, 3–4 anal setae per valve.

Gnathosoma  . 1 pair of palpal eupathids.

Legs. Empodia clawless, 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=3, Figs. 25, 26View FIGURES 23−28), 1 genital seta per valve, subcapitulum with 2 pairs of setae and one pair of adoral setae.

Deutonymph (n=4; Fig. 24View FIGURES 23−28), 5 genital setae per valve.

Adult male (n=5; Fig. 23View FIGURES 23−28), 13−15 genital setae per valve, 10 pairs of eugenitals.

Adult female (n=7; Fig. 21View FIGURES 16−22), 13−15 genital setae per valve, 1 pair of eugenital setae.

Type material. Holotype female, 6 paratype females, 5 paratype males, 4 paratype deutonymphs, 3 paratype protonymphs and 1 paratype larva, from soil under Maytenus cymosa  ( Celastraceae  ), vicinity of Potchefstroom, NORTH-WEST PROVINCE, 13 April 1972, J.A. van Huyssteen. Deposited at ARC-Plant Health and Protection, Pretoria, South Africa. 

Differential diagnosis. This species can easily be differentiated from the neotrichous species of the genus by having a holotrichous dorsum in all stages ( Fig. 27View FIGURES 23−28), and femora I with 3 solenidia (instead of 2 or 5–7).

Etymology. The species name refers to the prominent naso.