Paracheletogenes mirabilis, Khaustov & Salavatulin & Tsurikov & Thinh & Khaustov, 2024

Khaustov, Alexander A., Salavatulin, Vladimir M., Tsurikov, Sergey M., Thinh, Nguyen Van & Khaustov, Vladimir A., 2024, Free-living predatory cheyletid mites (Acariformes: Cheyletidae) from Cat Tien National Park, Vietnam, Zootaxa 5556 (1), pp. 268-295 : 288-292

Paracheletogenes mirabilis sp. nov.

( Figures 21–25 )

Description. Female (n=2). Length of idiosoma 225 (255), width 235 (255).

Dorsum ( Figs 21A , 24 , 25B–D ). Prodorsal shield with four pairs of lateral fan-shaped setae (vi, ve, si, se) and six pairs of dorsocentral dendrite-shaped setae ( Fig. 25B ); hysterosomal shield with five pairs of fan-shaped and four pairs of dendrite-shaped setae ( Figs 25C, D ). Setae c2 located on separate platelets; one pair of fan-shaped setae situated posteriad hysterosomal shield. Dorsal shields ornamented with very fine striae. Lyrifissures im and ip not evident. Soft cuticle out of shields striated and with distinct tubercles ( Figs 25C, D ).

Venter ( Fig. 21B ). Idiosomal venter with three pairs of intercoxal (1a, 3a, 4a), three pairs of aggenital (ag1– ag3), two pairs of genital (g1, g2), and three pairs of pseudanal setae (ps1–ps3); coxisternal fields I with two setae (1b, 1c), coxisternal fields II with one seta (2c), coxisternal fields III with two setae (3b, 3c), and coxisternal fields IV with two setae (4b, 4c). Setae 3b and 4b and one pair of setae posteriad anal opening barbed, fan-shaped; other ventral setae filiform, smooth; at least setae ps1 bifurcated. Ventral soft cuticle with smooth striae and only posteriad anal opening with tubercles as on dorsal side. Lyrifissures ih located laterad anal opening. With two pairs of smooth elongate cuticular areas posteriad coxisternal fields II and laterad setae 3a.

Gnathosoma ( Figs 22 , 25A ). Protegmen with fine longitudinal striae; tegmen with characteristic ornamentation as on Figure 25A . Peritremes with 5-6 pairs of segments. Palpal supracoxal setae (ep) hidden under lateral parts of peritremes. Palpal femur and genu fused laterally. Palpfemur with three setae, one fan-shaped dorsal (d) and two smooth, filiform ventral (v’, v”); palpgenu with two setae, one fan-shaped dorsal (d) and broadly lanceolate lateral (l”); palptibia with three smooth and pointed setae (d; l’, l”), seta d situated near anterior margin of flat anteromedian flange; setae d on femur and genu situated on short protuberances. Tibial claw with 7 processes. Tarsus with two comb-like setae (acm, sul), two sickle-like eupathidia (ul’ϛ, ul”ϛ) and one weakly clavate solenidion (ω); inner comb-like seta (acm) with 12 projections; outer comb-like seta (sul) with 13 projections. Adoral setae smooth, pointed; ao1 slightly shorter than ao2. Subcapitulum finely punctate, with one pair of long filiform setae n.

Legs ( Fig. 23 ). Lengths of legs: leg I 205 (200), leg II 140 (135), leg III 150 (145), leg IV 150 (145). Leg I ( Figs 23A , A’). Tarsus without pretarsus, with short solenidion ω 13 (11) situated on prominent nipple; setae ft and vs absent; with three blunt-tipped eupathidia (tc’ϛ, tc”ϛ, p’ϛ); (tc) as long as leg I, p’ two times shorter than (tc); tarsus with a pair of ventrodistal smooth and pointed short unguinal setae (u’, u”) and short, weakly barbed and blunt-tipped p” ( Fig. 23 A’). Tibia with two fan-shaped setae (d, l”), one lanceolate setae (l”), one smooth and pointed (v”), and tiny club-shaped dorsodistal solenidion φ 2 (2); genu with two fan-shaped setae (d, l’) and short weakly clavate dorsodistal seta k 2 (2) situated in shallow depression; femur with one fan-shaped seta (d) and one broadly lanceolate setae (v’); trochanter with one broadly lanceolate seta (v’); leg supracoxal seta (el) weakly clavate, similar in shape to seta k on genu, situated dorsomesad trochanter and usually covered by lateral margins of idiosomal soft cuticle. Leg II ( Fig. 23B ). Tarsus with three smooth pointed setae (tc’, tc”, vs), two weakly barbed, curved and slightly thickened setae (a), two filiform pointed and with long barbs unguinal setae (u’, u”), and lateral baculiform solenidion ω 9 (8); tibia with two fan-shaped setae (d, l”), one lanceolate seta (v’), and one filiform smooth and pointed seta (v”); genu with two fan-shaped setae (d, l’); femur with one dorsal fan-shaped seta (d) and one ventral lanceolate seta (v”); trochanter with one broadly lanceolate seta (v’). Leg III ( Fig. 23C ). Tarsus with three smooth pointed setae (tc’, tc”, vs), two weakly barbed, curved and slightly thickened setae (a), and wo filiform pointed and with long barbs unguinal setae (u’, u”); tibia with one fan-shaped seta (d), two broadly lanceolate setae (v’, l”), and one filiform smooth and pointed seta (v”); genu with two fan-shaped setae (d, l’); femur with two fan-shaped setae (d, v’); trochanter with two fan-shaped setae (l’, v’). Leg IV ( Fig. 23D ). Tarsus with three smooth pointed setae (tc’, tc”, vs), two weakly barbed, curved and slightly thickened setae (a), and wo filiform pointed and with long barbs unguinal setae (u’, u”); tibia with one fan-shaped seta (d), two broadly lanceolate seta (v’, l”), and one filiform smooth and pointed seta (v”); genu with two fan-shaped seta (d, l’); femur with two fan-shaped seta (d, v’); trochanter with one broadly lanceolate seta (v’).

Male and immatures unknown.

Type material. Female holotype, slide ST20215 , Vietnam, Cat Tien National Park, soil (0-10 cm), 11°23’51.1”N 107°22’28.8”E, 2.II.2015, collected by S.M. Tsurikov; paratypes: 1 female same locality and collector, litter, 3.II.2015 .

Type deposition. The holotype is deposited in the collection of the Zoological Institute of RAS, St, Petersburg, Russia, the paratype is deposited in the acarological collection of the Museum of Zoology , University of Tyumen, Tyumen, Russia.

Etymology. The name of the new species is derived from Latin mirabilis meaning wonderful.

Figures

FIGURE 21. Paracheletogenes mirabilis gen. and sp. nov., female (holotype): A—dorsum of idiosoma; B—venter of idiosoma.

FIGURE 22. Paracheletogenes mirabilis gen. and sp. nov., female (holotype):A—gnathosoma, dorsal aspect; B—gnathosoma, ventral aspect.

FIGURE 23. Paracheletogenes mirabilis gen. and sp. nov., female (paratype): A—left leg I, dorsal aspect; A’—distal part of tarsus I, ventral aspect; B–D—left legs III–IV, respectively, dorsal aspect.

FIGURE 24. Phase contrast micrograph of Paracheletogenes mirabilis gen. and sp. nov., female (paratype): general view dorsally.

FIGURE 25. DIC micrograph of Paracheletogenes mirabilis gen. and sp. nov., female: A—gnathosoma, dorsal aspect; B— prodorsum; C—opisthosoma, dorsal aspect (holotype); D—opisthosoma, dorsal aspect (paratype).