Pseudotarsonemoides Vitzthum, 1921 Pseudotarsonemoides peruviensis, Khaustov & Petrov & Kolesnikov, 2021Pseudotarsonemoides, Vitzthum, 1921

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 : 47-51

publication ID

https://doi.org/10.11646/zootaxa.4966.1.4

publication LSID

lsid:zoobank.org:pub:020D9DD0-1FAF-4FEA-B210-DCC271A7733F

DOI

https://doi.org/10.5281/zenodo.4729405

persistent identifier

https://treatment.plazi.org/id/273B87CD-0A4B-9451-FF01-FF36FBBD7510

treatment provided by

Plazi

scientific name

Pseudotarsonemoides Vitzthum, 1921 Pseudotarsonemoides peruviensis Pseudotarsonemoides
status

n. sp.

Genus Pseudotarsonemoides Vitzthum, 1921  

Type species: Pseudotarsonemoides eccoptogasteris Vitzthum, 1921   , by original designation.

Diagnosis

Female. All dorsal shields without striae; posterior margins of tergites C and D with deep medial and lateral incisions; 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; tegula unusually long, tongue-shaped; solenidion φ 2 absent.

Pseudotarsonemoides peruviensis   n. sp.

( Figs 5-8 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 )

Description

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

Gnathosoma ( Fig. 6 View FIGURE 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 View FIGURE 5 ). 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 View FIGURE 5 ). 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 View FIGURE 7 , 8 View FIGURE 8 ). Lengths of legs: I 60 (56), II 58 (54), III 52 (49), IV 30 (28). Leg I ( Fig. 7A View FIGURE 7 ): 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 View FIGURE 7 ): 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 View FIGURE 8 ): 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. GoogleMaps   Paratype: 1 female, same data. GoogleMaps  

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).

Key to females of Pseudotarsonemoides   (after Smiley & Moser 1974, with modifications)

1. Dorsal idiosoma without conspicuous longitudinal ridges..................................................... 4

- Dorsal idiosoma with conspicuous longitudinal ridges........................................................ 2

2. Setae e and h subequal................................................................................. 3

- Setae e more than twice longer than h .............................................. P. longisetus Khaustov, 1998  

3. Idiosoma almost three times longer than wide, stigmata located near lateral margin of prodorsal shield............................................................................................. P. vermiformes Khaustov, 1998  

- Idiosoma about two times longer than wide, stigmata located far from lateral margin of prodorsal shield........................................................................................... P. innumerabilis Vitzthum, 1923  

4. Solenidion φ 2 present, tegula approximately equal in length and width........................................... 5

- Solenidion φ 2 absent, tegula almost two times longer than wide................................. P. peruviensis   n. sp.

5. Setae e several times longer than f ....................................................................... 6

- Setae e and f subequal........................................................... P. pteleobii Cooreman, 1963  

6. Dorsal hysterosomal setae smooth....................................................................... 7

- Dorsal hysterosomal setae barbed............................................... P. scolyti Smiley & Moser, 1974  

7. Tibia III without sclerotized notches...................................................................... 8

- Tibia III with sclerotized notches........................................... P. americanus Smiley & Moser, 1974  

8. Idiosoma long and slender, about 2.4 times longer than wide, trichobothria globe-like, or, trachea long and slender................................................................................. P. fechteri Smiley & Moser, 1974  

- Idiosoma short and oval, about 1.8 times longer than wide, trichobothria ellipsoidal, trachea long and stout....................................................................................... P. eccoptogasteris Vitzthum, 1921  

Pseudotarsonemoides peruviensis   n. sp.

( Figs 5-8 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 )

Description

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

Gnathosoma ( Fig. 6 View FIGURE 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 View FIGURE 5 ). 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 View FIGURE 5 ). 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 View FIGURE 7 , 8 View FIGURE 8 ). Lengths of legs: I 60 (56), II 58 (54), III 52 (49), IV 30 (28). Leg I ( Fig. 7A View FIGURE 7 ): 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 View FIGURE 7 ): 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 View FIGURE 8 ): 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. GoogleMaps   Paratype: 1 female, same data. GoogleMaps  

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).

Key to females of Pseudotarsonemoides   (after Smiley & Moser 1974, with modifications)

1. Dorsal idiosoma without conspicuous longitudinal ridges..................................................... 4

- Dorsal idiosoma with conspicuous longitudinal ridges........................................................ 2

2. Setae e and h subequal................................................................................. 3

- Setae e more than twice longer than h .............................................. P. longisetus Khaustov, 1998  

3. Idiosoma almost three times longer than wide, stigmata located near lateral margin of prodorsal shield............................................................................................. P. vermiformes Khaustov, 1998  

- Idiosoma about two times longer than wide, stigmata located far from lateral margin of prodorsal shield........................................................................................... P. innumerabilis Vitzthum, 1923  

4. Solenidion φ 2 present, tegula approximately equal in length and width........................................... 5

- Solenidion φ 2 absent, tegula almost two times longer than wide................................. P. peruviensis   n. sp.

5. Setae e several times longer than f ....................................................................... 6

- Setae e and f subequal........................................................... P. pteleobii Cooreman, 1963  

6. Dorsal hysterosomal setae smooth....................................................................... 7

- Dorsal hysterosomal setae barbed............................................... P. scolyti Smiley & Moser, 1974  

7. Tibia III without sclerotized notches...................................................................... 8

- Tibia III with sclerotized notches........................................... P. americanus Smiley & Moser, 1974  

8. Idiosoma long and slender, about 2.4 times longer than wide, trichobothria globe-like, or, trachea long and slender................................................................................. P. fechteri Smiley & Moser, 1974  

- Idiosoma short and oval, about 1.8 times longer than wide, trichobothria ellipsoidal, trachea long and stout....................................................................................... P. eccoptogasteris Vitzthum, 1921  

Key to females of Pseudotarsonemoides   (after Smiley & Moser 1974, with modifications)

1. Dorsal idiosoma without conspicuous longitudinal ridges..................................................... 4

- Dorsal idiosoma with conspicuous longitudinal ridges........................................................ 2

2. Setae e and h subequal................................................................................. 3

- Setae e more than twice longer than h .............................................. P. longisetus Khaustov, 1998  

3. Idiosoma almost three times longer than wide, stigmata located near lateral margin of prodorsal shield............................................................................................. P. vermiformes Khaustov, 1998  

- Idiosoma about two times longer than wide, stigmata located far from lateral margin of prodorsal shield........................................................................................... P. innumerabilis Vitzthum, 1923  

4. Solenidion φ 2 present, tegula approximately equal in length and width........................................... 5

- Solenidion φ 2 absent, tegula almost two times longer than wide................................. P. peruviensis   n. sp.

5. Setae e several times longer than f ....................................................................... 6

- Setae e and f subequal........................................................... P. pteleobii Cooreman, 1963  

6. Dorsal hysterosomal setae smooth....................................................................... 7

- Dorsal hysterosomal setae barbed............................................... P. scolyti Smiley & Moser, 1974  

7. Tibia III without sclerotized notches...................................................................... 8

- Tibia III with sclerotized notches........................................... P. americanus Smiley & Moser, 1974  

8. Idiosoma long and slender, about 2.4 times longer than wide, trichobothria globe-like, or, trachea long and slender................................................................................. P. fechteri Smiley & Moser, 1974  

- Idiosoma short and oval, about 1.8 times longer than wide, trichobothria ellipsoidal, trachea long and stout....................................................................................... P. eccoptogasteris Vitzthum, 1921  

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Prostigmata

Family

Tarsonemidae

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Prostigmata

Family

Tarsonemidae

Genus

Pseudotarsonemoides

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Prostigmata

Family

Tarsonemidae