Pseudotarsonemoides peruviensis, Khaustov & Petrov & Kolesnikov, 2021

Khaustov, Alexander A., Petrov, Alexander V. & Kolesnikov, Vasiliy B., 2021, A new genus and two new species of Tarsonemidae (Acari: Heterostigmata) associated with bark beetles (Coleoptera: Curculionidae: Scolytinae) from Peru, Zootaxa 4966 (1), pp. 41-53 : 48-51

Pseudotarsonemoides peruviensis n. sp.

( Figs 5-8 )

Description

Female. Length of idiosoma 210 (210), width 82 (71).

Gnathosoma ( Fig. 6 ). Length of gnathosomal capsule 41 (36), width 20 (18). Gnathosoma completely covered by prodorsal shield. Dorsomedian apodeme not evident. Gnathosoma with dorsal pair of setae ch 6 (5) two times shorter than subcapitular setae m 11 (10); both setae slender and smooth. Postpalpal setae (pp) about as long as ch, slender and weakly blunt-tipped. Palptibial claw well developed; palpal setae dFe and dGe rod-like. Round remnants of palpal solenidia situated laterad well developed round accessory setigenous structures (ass). Posterior ventral margin of gnathosoma with deep incision. One pair of round, probably subcuticular structures located posteriad setae ch (probably alveolar remnants of 2 nd pair of dorsal cheliceral setae). Cheliceral stylets long, slightly shorter than gnathosomal width; cheliceral levers large, c-shaped, poorly sclerotized, about half as long as cheliceral stylets. Pharynx with well sclerotized horseshoe-shaped walls.

Idiosomal dorsum ( Fig. 5A ). All dorsal shields with uniform sparsely distributed puncta, without striae. Trichobothria capitate, ellipsoidal, finely spiculate and rounded apically, completely covered by prodorsal shield. Alveolar pits v 2 situated anteromesad bases of setae sc 2. Stigmata located on undersurface of shield far from lateral margin of prodorsal shield. Trachea long and narrow. Posterior margin of prodorsal shield deeply concave; posterior margins of tergites C and D with deep medial and lateral incisions; posterior margin of tergite EF weakly concave. Posterior parts of tergites C, D, and EF with delicate longitudinal striae. Setae v 1, sc 2, c 1, and c 2 smooth, other dorsal setae weakly barbed; setae v 1, sc 2, c 2 and h pointed, other dorsal setae blunt-tipped. Lengths of dorsal setae: v 1 45 (39), sc 2 38 (40), c 1 18 (18), c 2 23 (22), d 31 (31), e 31 (28), f 14 (15/17), h 29 (27). Distances between setae: v 1 – v 1 22 (23), v 2 – v 2 33 (32), sc 2 – sc 2 42 (42), c 1 – c 1 35 (36), c 2 – c 2 92 (88), c 1 – c 2 25 (19), d–d 36 (33), e–e 34 (34), e–f 8 (7), f–f 26 (26), h–h 36 (33).

Idiosomal venter ( Fig. 5B ). Puncta on ventral plates hardly discernible. Setae ps blunt-tipped and weakly barbed, other ventral setae smooth, pointed. Pits 1 b and 2 b not evident. Posterior margin of aggenital plate evenly rounded. Poststernal plate with two large lobes anteriorly. Apodemes 1 forming Y-shaped juncture with prosternal apodeme; apodemes 2 not fused with prosternal apodeme; prosternal apodeme not fused with sejugal apodeme; sejugal apodeme developed only laterally; poststernal apodeme very small; apodemes 3 and 4 not evident. Setae 1 a located on apodemes 1; setae 2 a located on apodemes 2. Tegula unusually long, tongue-shaped, length 38 (37), maximum width 20 (22). Lengths of ventral setae: 1 a 13 (13), 2 a 13 (14), 3 a 13 (13), 3 b 13 (13), 3 c 19 (16), 4 b 18 (15), ps 21 (20).

Legs ( Figs 7 , 8 ). Lengths of legs: I 60 (56), II 58 (54), III 52 (49), IV 30 (28). Leg I ( Fig. 7A ): number of setae and solenidia on femur, genu, tibia, and tarsus, respectively: 3-4-6(1 φ) + 9(l ω). Solenidion ω lanceolate, φ 1 capitate; solenidion φ 2 absent; seta k 7 (7) lanceolate, located in shallow depression with solenidion φ 1. Lengths of solenidia: ω 6 (7), φ 1 5 (6). Setae d, l’ of femur, l’, l” and v’ of genu barbed, other leg setae smooth; setae d, l′ of femur, l’ and v′ of genu, (p) and (tc) of tarsus blunt-tipped; other leg setae pointed. Tarsal claw large, blunt-tipped. Leg II ( Fig. 7B ): number of setae and solenidia on femur, genu, tibia, and tarsus, respectively: 2-3-4- 7(l ω). Solenidion ω 6 (5) lanceolate. Setae pl” and u’ of tarsus spine-like; setae d, l′ of femur, l’, v’ of genu and l’ of tibia blunt-tipped, other leg setae pointed; setae d, l′ of femur, l’, l”, v’ of genu and l’ of tibia barbed, other leg setae smooth; setae l’ of genu and tibia distinctly thickened. Leg III ( Fig. 8A ): number of setae and solenidia on femur, genu, tibia, and tarsus, respectively: 1+3-4-6. Seta u’ of tarsus spiniform and hooked; seta d of tibia blunt-tipped and barbed; other leg setae pointed and smooth. Leg IV (Fig, 8B): seta v’ of tibia barbed and weakly blunt-tipped, other leg setae pointed and smooth. Seta tc″ very long; seta v” of tibia very small and thin, hardly discernible. Lengths of setae: v’Fe 11 (10), v’Ge 14 (13), v’Ti 39 (37), v”Ti 2 (2), tc” 130 (125).

Type material. Female holotype, slide ZISP T-Tar-002, PERU: Junín Prov., left bank of Perené River, 5 km NE from Puerto Ocopa , Canan Eden village., 1100 m, S11°04’23.9’’ W74°16’40.6’’, between coxae I and II on beetles Phloeotribus biguttatus ( Blandford, 1897) , 10.03.2009 A. Petrov leg. Paratype: 1 female, same data.

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

Etymology. The specific epithet of the new species refers to its geographical distribution.

Differential diagnosis. The new species clearly differs from all known species of the genus by having an unusually long tegula, almost two times longer than wide (subequal length and width in other species) and by lacking solenidion φ 2 (present in other species).

Figures

FIGURE 5. Pseudotarsonemoides peruviensis n. sp., female: A—dorsum of body, B—venter of body. Legs omitted.

FIGURE 6. Pseudotarsonemoides peruviensis n. sp., female: A—gnathosoma, dorsal aspect, B—gnathosoma, ventral aspect.

FIGURE 7. Pseudotarsonemoides peruviensis n. sp., female: A—left leg I, dorsal aspect, B—right leg II, dorsal aspect.

FIGURE 8. Pseudotarsonemoides peruviensis n. sp., female: A—left leg III, ventral aspect, B—left leg IV, ventral aspect.