Scutacarus myrmicinus, Khaustov, Alexander A., 2015

Khaustov, Alexander A., 2015, Three new species of myrmecophilous scutacarid mites (Acari: Scutacaridae) from Western Siberia, Russia, Zootaxa 4013 (2), pp. 265-279 : 270-272

publication ID	https://doi.org/ 10.11646/zootaxa.4013.2.7
publication LSID	lsid:zoobank.org:pub:78DDD4C3-A37A-45DA-B190-673224664C97
DOI	https://doi.org/10.5281/zenodo.6107308
persistent identifier	https://treatment.plazi.org/id/03D6332E-FFDB-FFB5-30DB-ACACFE6E7EAF
treatment provided by	Plazi
scientific name	Scutacarus myrmicinus
status	sp. nov.

Treatment

Scutacarus myrmicinus sp. nov.

( Figs. 5–8 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 , 12 View FIGURE 12 B)

Description. FEMALE (holotype). Length of idiosoma 215 (215–220 in 7 paratypes), width 200 (190–200). Gnathosoma ( Fig. 5 View FIGURE 5 ): similar to that of S. lasiophilus sp. nov. but postpalpal setae not evident. Rough microsculpture present only on lateral surfaces of gnathosoma and not reaching to bases of setae m. Idiosomal dorsum ( Fig. 5 View FIGURE 5 A): prodorsum as in S. lasiophilus sp. nov. All dorsal shields with numerous small dimples. Setae e and h 2 vestigial, other dorsal setae distinctly barbed and blunt-ended. Cupules ia on tergite D and ih on tergite H large, round. Tergite EF with 1 pair of oval porous fields situated anteromedially to setae f. Pair of small pore-like structures situated posteromedially to setae c 1. Lengths of dorsal setae: c 1 34 (33 – 34), c 2 27 (25 – 28), d 41 (41–42), f 51 (50–55), h 1 47 (44–48). Distances between setae: c 1– c 1 68 (67–69), d–d 110 (105–110), f–f 115 (110–115), h 1– h 1 58 (56–58). Idiosomal venter ( Fig. 5 View FIGURE 5 B). All ventral plates with numerous small dimples. Apodemes 1–4 as in S. lasiophilus sp. nov. Apodemes 5 present, diffuse, joined with appo. Setae 2 b slightly thickened, smooth, bluntended, setae 4 a smooth, situated distinctly posteriorly to 4 b and reaching beyond posterior margin of poststernal plate, setae ps 3 short and smooth. Other ventral setae distinctly barbed. Secondary transverse sclerotized line on poststernal plate present. Anterior genital sclerite complicate, similar with that of S. lasiophilus sp. nov. ( Fig. 12 View FIGURE 12 B), posterior genital sclerite large, triangular. Lengths of ventral setae: 1 a 39 (34–39), 1 b 25 (23–26), 2 a 30 (28–30), 2 b 22 (21–23), 3 a 38 (37–40), 3 b 47 (43–48), 3 c 49 (46–50), 4 a 15 (15–16), 4 b 46 (45–48), 4 c 51 (50–55), ps 1 22 (20– 22), ps 2 17 (16–17), ps 3 5 (4–5). Legs ( Figs. 7 View FIGURE 7 , 8 View FIGURE 8 ). Leg I ( Fig. 7 View FIGURE 7 A) as in S. lasiophilus sp. nov. except presence of round pit (vestiges of seta v”) on genu. Lengths of solenidia: ω 1 8 (8–9)> ω 2 6 (6–7) <φ 1 7 (6–7)> φ 2 6 (6–7); ω 2 and φ 2 baculiform, φ 1 clavate, ω 1 finger-shaped. Leg II ( Fig. 7 View FIGURE 7 B) as in S. lasiophilus sp. nov. except distinctly barbed seta pl”. Solenidion ω 6 (6–7) finger-shaped. Leg III ( Fig. 8 View FIGURE 8 A) as in S. lasiophilus sp. nov. except distinctly barbed seta pl”. Leg IV ( Fig. 8 View FIGURE 8 B) as in S. lasiophilus sp. nov. except seta tc” distinctly barbed and longer than d of tibiotarsus.

MALE and LARVA unknown.

Type material. Female holotype, slide VS 300714 A and 9 female paratypes, RUSSIA:Tyumen Province, Tyumen region, vicinity of settlement Narimanovo, 57o21′56″ N, 65o08′21″ E, in nest of Myrmica ruginodis Nylander , 30 July 2014, coll. V.A. Stolbov.

Type deposition. Holotype and 7 paratypes deposited in TUMZ; 2 paratypes in ZISP.

Etymology. The name of a new species is referring to its association with ants of the genus Myrmica .

Differential diagnosis. Female of the new species is most similar to S. suborbiculatus Rack, 1964 by the presence of secondary sclerotized line on the poststernal plate and similar relative lengths of dorsal idiosomal setae. It differs from S. suborbiculatus by longer dorsal hysterosomal setae, 41–55 long (vs. 32–33 in S. suborbiculatus ), by distinctly shorter setae 4 a and 4 b, 15–16 and 45–48 long respectively (vs. 34 and 73) and by distinctly barbed setae ps 2 (vs. smooth).