Macronyssus temujini, Orlova & Anisimov, 2023

Orlova, Maria V. & Anisimov, Nikolay V., 2023, Three new species of bat-parasitic gamasid mites of the genera Spinturnix, Macronyssus and Steatonyssus (Acari: Mesostigmata: Spinturnicidae, Macronyssidae) from Siberia and Mongolia, with keys to species of Russia and adjacent countries, Persian Journal of Acarology 12 (2), pp. 211-239 : 219-221

Macronyssus temujini sp. nov.

http://zoobank.org/ urn:lsid:zoobank.org:act:85ECC57C-CD02-4348-8560-9D4F845EE850

Diagnosis (female)

Idiosoma oval, relatively small (480 × 270), weakly sclerotized. Dorsal shield with 26 pairs of setae; j1 off dorsal plate; s3, z4 absent; z3–z5 ratio about 2.5:1. Sternal glands with two semicircular zones surrounding few short striae; St1 reaching posterior margin of sternal plate. Epigynial plate without accessory setae. Peritremes terminate at about middle of coxae I. Deutosternal groove with nine denticles in single row. Fixed cheliceral digit with two well developed ventral spines.

Description (female)

Dorsal idiosoma ( Figs. 6 , 8 ) – Single dorsal plate, elongated, with nine corners, relatively large, 447 long and 207 wide; with reticulate and rounded sculpturing over entire dorsal plate; with 26 pairs of smooth setae; j1 off shield; j2–6, J1, J2, J3, J5, z2–3, z5–6, Z2–5, s1–2, s4–6, S1–3, r3–4 on plate; s3, z4 absent; z3–z5 ratio about 2.5: 1; anterolateral setae (z2–3, z5–6, Z4–5, s1–2, s4–6, S1–3, r3–4) slender and long (25–54; submedian setae (j2–6, J1, J2, J3, J5) of medium length (17–25); J5 microsetae. Unarmed dorsal integument with 29 lateral setae 32–35 long. Peritremes with stigma on dorsal side of idiosoma, terminating at about middle of coxa I ( Figs. 8, 10 ).

Ventral idiosoma ( Figs. 7 , 9 ) – Sternal shield 46 long and 129 wide; setae St1 49, St2 53, St3 55. Posterior margin of sternal plate indistinct, concave, reaching level between St2 and St3. Setae St1 reaching posterior margin of sternal plate. Sternal glands (paired organ in anterolateral corners of sternal shields) with two semicircular zones surrounding few short striae; with two pairs of sternal pores ( Figs. 15–16 ). Epigynial plate 185 long and 98 wide, tongue-shaped, broad, with well developed sculpturing; posterior edge smoothly rounded, without extension; epigynial setae 46, situated at posterior 1/3 of epigynial plate. Anal plate 83 long and 65 wide, inversely pyriform, with one pair of adanal setae (19) and unpaired postanal seta (30). Opisthosoma with about 33 pairs of ventral setae (23–33), caudal setae 35 long.

Legs – Legs stout and long (352–457); tibia I length/width ratio about 1:1 ( Fig. 14 ). Coxa II with well-developed spur; coxae II and III have well-developed ventral ridges. Chaetotaxy of legs is presented in Table 2.

Gnathosoma ( Fig. 11 ) – Gnathosoma 147 long (including palps). Tritosternum bipartite, with expanded base (22 wide). Gnathosomal base subrectangular in outline, with well-developed sclerotization. There are three pairs of hypostomal setae and one pair of gnathosomal setae. Deutosternal groove with 9 denticles in single row. Palpal trochanter has a ridge-like ventral process ( Fig. 11 , arrows). Chelicera 82 long ( Fig. 12 ), fixed chela 29 long with sculpturing near tip and with two ventral spines, movable chela 26 long conical with massive base sharply narrowed tip and expressed sculpturing.

Differential diagnosis

Macronyssus temujini belongs to the crosbyi species group. The new species is similar to Macronyssus tigirecus in having 26 pairs of setae on the dorsal plates; the two species differ by a specific pattern of the sternal glands on the sternal shield ( Figs. 9 , 15, 16 ).

Male, protonymph and deutonymph: Unknown.

Type material

Holotype female, Russia: Buryatia Republic, Hongor-Uula (Natural park “Tunkinskiy”), 51° 40ʹ N, 102° 15ʹ E, ex Murina hilgendorfi sibirica ( Chiroptera : Vespertilionidae ), 8 August 2016, D.V. Kazakov).

Etymology

The species is named after Genghis Khan (Temujin), the founder of Mongol empire, which incorporated modern-day Buryatia.

Figures

Figures 6–7. Macronyssus temujini sp. nov. (female, photograph) – 6. Dorsal idiosoma; 7. Ventral idiosoma. Scale bar 100 µm.

Figure 8–14. Macronyssus temujini sp. nov. (female) – 8. Dorsally idiosoma, A. Podonotum with podonotal setae, B. Opisthonotum and opisthonotal setae; 9. Ventral idiosoma; 10. Peritreme; 11. Ventral gnathosoma, arrows mark palp trochanter ridges; 12. Chelicera, arrows mark two ventral spines on fixed digit; 13. Coxa II; 14. Tibia I. Scale bar: 8, 9: 100 µm; 10, 11, 13: 50 µm; 12, 14: 25 µm.

Figures 15–16. Sternal shield of Macronyssus temujini sp. nov. (female) – 15. Photograph, 16. Drawing. Scale bar 50 µm.