Steatonyssus pseudoheteroventralis, 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 : 226-231

publication ID	https://doi.org/ 10.22073/pja.v12i2.76740
publication LSID	lsid:zoobank.org:pub:85ECC57C-CD02-4348-8560-9D4F845EE850
persistent identifier	https://treatment.plazi.org/id/2E115015-5A9E-47A9-A65A-8F7CF6D15AC3
taxon LSID	lsid:zoobank.org:act:2E115015-5A9E-47A9-A65A-8F7CF6D15AC3
treatment provided by	Felipe
scientific name	Steatonyssus pseudoheteroventralis
status	sp. nov.

Treatment

Steatonyssus pseudoheteroventralis sp. nov.

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

Diagnosis

Female – Idiosoma oval, podosomal shield with 11 pairs of setae, j2 approximately ¾ of j3. Opisthosomal plate with reticulate pattern, with 7 pairs of setae (including a pair of microsetae). Sternal plate with posterior marginal band better sclerotized than remainder of plate. Genital shield tongue-shaped, with striped sculpture. Peritremes terminate near posterior margin of coxae II; peritremal plate interrupted anterior to peritreme. Male – Entire dorsal shield with a narrow opisthosomal portion, bearing 19 pairs of setae. Ventrum with separate sternogenitoventral and anal plates. Anterior seta of coxa III simple, without bladelike extension.

Description

Female – Measurements summarized in Table 3.

Dorsal idiosoma ( Figs. 33–34 View Figures 33–38 ) – Idiosoma approximately 850 long, 500 wide. Podonotal shield rounded triangular ( Fig. 35 View Figures 33–38 ), 213–280 long and 241–249 wide, with squamous pattern, bearing 11 pairs of setae: middle line j1, j2, j3, j4, j5, z5, j6; lateral line z2, z3, s4, s5. Opisthonotal shield sphenoid ( Fig. 36 View Figures 33–38 ), 319–356 long and 165–169 wide, with reticulate pattern, anterior margin concave, seven pairs of setae (including two pairs of microsetae): J1, J2, J3, J5, S4, S5, Z5, and five pairs of pores on opisthonotal plate. Dorsal unarmed surface with 41–47 pairs of spiny setae.

Females Males Characters

Holotype n Range Mean Holotype n Range Mean Podonotal shield length 248 4 213-280 246 - - - -

width 247 4 241-249 246 - - - - Opisthonotal shield length 319 4 319-356 343 - - - -

width 165 4 165-169 168 - - - - Sternal shield length 44 4 44-48 46 - - - -

width 139 4 133-139 136 - - - - Epyginial shield length 261 3 261-269 265 - - - -

width 103 3 92-107 101 - - - - Dorsal shield length - - - - 481 2 481, 485 483

width - - - - 217 2 217, 232 225 Sternogenitoventral length - - - - 226 2 218, 226 222 shield width - - - - 128 2 128, 138 133 Anal shield length 144 4 143-168 155 117 2 117, 121 119

width 88 4 80-88 85 63 2 63, 68 66 Seta j1 length 10 3 10-12 11 18 2 18, 19 18.5 j2 length 13 4 13-15 13 10 2 10, 12 11 j3 length 14 4 13-16 14 23 2 22, 23 22.5 j4 length 18 4 17-20 19 17 2 15, 17 16 j5 length 14 4 13-15 14 22 2 22, 23 22.5 j6 length 14 4 13-16 15 20 2 18, 20 19 z2 length 20 4 19-20 20 22 2 21.5, 22 22 z3 length 23 4 21-25 24 28 2 28, 29 28.5 z5 length 14 4 13-16 15 20 2 20, 21 20.5 s 4 length 26 4 23-26 25 30 2 30, 33 31.5 s 5 length 23 4 22-23 22 30 2 30, 31 30.5 J1 length 30 4 27-31 29 20 2 20, 22 21 J2 length 28 4 26-28 27 22 2 22, 24 23 J3 length 22 4 20-25 22 14 2 13, 14 13.5 S 4 length 10 4 10-11 11 8 2 7, 8 7.5 S 5 length 7 4 5-7 6 5 2 5, 6 5.5 Dorsal unsclerotized length 40-43 20 34-52 45 28-30 10 27-32 28.5 integument setae

Seta St1 length 26 4 24-26 25 24 2 24, 27 25.5 St2 length 25 4 24-26 25 28 2 27, 28 27.5 St3 length 27 4 26-27 27 23 2 23, 25 24 St4 length 47.5 4 45-49 47 17 2 17, 20 18.5 Ventral unsclerotized length 30-45 20 21-52 36 16-31 10 13-34 24.5 integument setae

Preanal setae length 30 4 29-31 30 19 2 19, 20 19.5 Postanal setae length 29 4 28-32 30 16 2 16, 16 16 Gnathosoma length 204 4 204-296 241 128 2 128, 136 132

width 89 4 89-128 109 72 2 72, 77 74.5 hyp1 length 12 3 11-12 11 8 1 - - hyp2 length 10 3 9-10 10 6 1 - - hyp3 length 24 3 23-25 24 17 1 - - pc length 14 3 13-14 14 9 1 - -

Ventral idiosoma ( Figs. 37–38 View Figures 33–38 ) – Sternal shield concave posteriorly, 44–48 long and 133–139 wide, with compressed reticulate pattern and posterior sclerotized margin. Epigynial plate 261–269

long and 92–107 wide, with blunt, membranous anteromedial projection. Anal shield pear-shaped, 143–168 long and 80–88 wide. Integument of idiosoma with approximately 20–25 pairs of spiny setae ventrally. Anus very close to anterior margin of anal plate; adanal and postanal setae subequal. Peritremes reach posterior half of coxa II; peritremal plate interrupted anterior to peritreme, with a separate, short leaflike portion over coxae I and II.

Legs – Coxae II with anterodorsal spur. Chaetotaxy of legs is presented in Table 4. Gnathosoma ( Figs. 39 View Figure 39–41 , 44 View Figures 44–45 ) – Deutosternal groove with nine denticles arranged 1–1–1–1–1–1– 1–1–1. Gnathosoma with three pairs of hypostomal setae and one pair of gnathosomal setae. Hyp1, hyp2 and pc subequal, hyp3 long.

Male – Measurements are given in Table 3.

idiosoma, drawing. Scale bar 100 µm.

Dorsal idiosoma ( Figs. 40–41 View Figure 39–41 ) – Idiosoma approximately 500 long, 300 wide. Dorsal shield entire, 481, 485 long and 217, 232 wide, with a narrow opisthosomal portion; reticulate over most of its part, but with longitudinal striations near posterior tip; with 19 pairs of setae, 12 in podosomal region (with one additional anterolateral pair as compared to female) and seven in opisthosomal region (as in female). Dorsal unsclerotized cuticle with 10–15 pairs of spiny setae.

Ventral idiosoma ( Figs. 42–43 View Figures 42–43 ) – With sternogenitoventral and anal shield; shields separated by striate unsclerotized cuticle with two sclerites; sternogenital portion of ventral shield 218; 226 long and 128, 138 wide, with sternal (St1, St2, St3), one pair of genital setae and one pair of ventral setae; metasternal setae (St4) situated on unsclerotized cuticle. Anal plate 117, 121 long and 63, 68 wide, with anterior margin convex and rounded, lateral margins somewhat thickened. Peritremes short, terminating at level of coxa III. Ventral unsclerotized cuticle with 9–10 pairs of spiny setae.

Legs – Anterior seta of coxa III simple, without blade-like anterior projection.

Gnathosoma – As in female. Chelicerae (including chela, without basic segment) 147 long; chela 56 long; fixed digit clavate, 39 long; movable digit massive, spermatodactyl nearly straight, 11 long ( Fig. 45 View Figures 44–45 ).

Protonymph, deutonymph and larva: Unknown.

Differential diagnosis

The male of Steatonyssus pseudoheteroventralis is similar to that of S. heteroventralis Ah & Radovsky 1967 in having divided ventral sclerotization but differ in setae St4 situated on unsclerotized cuticle (vs St4 on the sternogenitoventral shield in S. heteroventralis ) and fewer idiosomal setae: 8 pairs of ventral setae in S. pseudoheteroventralis vs. 13 in S. heteroventralis and 10–15 pairs of dorsal setae in S. pseudoheteroventralis vs. 25 in S. heteroventralis . Females of the two species also differ by the number of dorsal setae situated on unsclerotized cuticle: 30 pairs in S. pseudoheteroventralis vs more than 50 pairs in S. heteroventralis .

Type material Holotype female, 3 paratype females and 1 paratype male, Mongolia: oasis Dzulganay, 43° 35ʹ N, 100° 04ʹ E, ex Eptesicus gobiensis Bobrinskii, 1926 ( Chiroptera : Vespertilionidae ), 28 July 2013, leg. V.S. Lebedev. Other specimens: Russia: Irbitey River (Tuva Republic, Russia), 50° 44ʹ N, 93° 08ʹ E, male ex Ep. gobiensis , 22 July 2016, leg. A. V. Zhigalin.

Etymology

The new species epithet is derived from the prefix pseudo (false) and heteroventralis ( Steatonyssus heteroventralis , a morphologically similar species).