Scutacarus lasiophilus, 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 : 266-268

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.6107304
persistent identifier	https://treatment.plazi.org/id/03D6332E-FFDF-FFB1-30DB-AD28FCDF78B8
treatment provided by	Plazi
scientific name	Scutacarus lasiophilus
status	sp. nov.

Treatment

Scutacarus lasiophilus sp. nov.

( Figs. 1–4 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 , 12 View FIGURE 12 A)

Description. FEMALE (holotype). Length of idiosoma 195 (185–215 in 7 paratypes), width 200 (175–215). Gnathosoma ( Fig. 2 View FIGURE 2 ): gnathosomal capsule oval, with well-developed dorsal median apodeme, dorsally with 2 pairs of smooth and pointed setae (cha, chb) and 1 pair of postpalpal setae (pp), situated anterolaterally to bases of setae cha ( Fig. 2 View FIGURE 2 A). Palps dorsolaterally with subequal setae dFe and dGe. Palps ventrally with large mushroomlike accessory setigenous structure (ass). Palpal solenidion absent. Palps terminated with small tibial claw. Gnathosomal venter with 1 pair of pointed subcapitular setae m and pair of round pits situated posteriorly to bases of setae m ( Fig. 2 View FIGURE 2 B). Central part of subcapitulum with small dimples; lateral parts of gnathosoma with rough microsculpture reaching to bases of setae m. All pharyngeal pumps transversely striated. Pharyngeal pump 1 oval, separated from pharyngeal pump 2 by length of pharyngeal pump 1, pharyngeal pump 2 slightly larger than pump 1, oval, pharyngeal pump 3 oval, subequal to pharyngeal pump 1( Fig. 2 View FIGURE 2 B). Idiosomal dorsum ( Figs. 1 View FIGURE 1 A, 2A). Prodorsum completely covered by tergite C, with 2 pairs of smooth needle-like setae v 2 and sc 2, 1 pair of barbed capitate trichobothria, and 1 pair of oval stigmata associated with long tracheal trunks ( Fig. 2 View FIGURE 2 A). Lateral propodosomal spine absent. All dorsal shields with numerous small dimples. Setae e vestigial; h 2 not evident, 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. Lengths of dorsal setae: c 1 34 (29 – 34), c 2 28 (27 – 28), d 33 (32–33), f 27 (25–27), h 1 30 (27–30). Distances between setae: c 1– c 1 61 (56–67), d–d 99 (87–110), f–f 115 (105–125), h 1– h 1 48 (45–49). Idiosomal venter ( Fig. 1 View FIGURE 1 B). All ventral plates with numerous small dimples. Apodemes 1 (ap1) well-developed and joined with prosternal apodeme (appr), apodemes 2 (ap2) w-like, joined with appr; sejugal apodeme (apsej) well-developed and joined with appr. Secondary transverse apodeme absent. Apodemes 3 (ap3) weakly developed, diffuse, ap4 short, joined with poststernal apodeme (appo). Apodemes 5 indistinct. Setae 2 b slightly thickened, smooth, blunt-ended, 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. Distance 4 a –4 a subequal to distance 4 a –4 b.

Secondary transverse sclerotized lines on poststernal and aggenital plates present. Anterior genital sclerite complicate, consists of median tongue-like elongation connected with sclerotized oval structure ring laterally with tube-like sclerites ( Fig. 12 View FIGURE 12 A), posterior genital sclerite large, triangular. Lengths of ventral setae: 1 a 36 (33–37), 1 b 28 (26–31), 2 a 27 (23–28), 2 b 25 (23–26), 3 a 40 (37–42), 3 b 36 (35–42), 3 c 34 (30–35), 4 a 26 (19–27), 4 b 49 (48– 52), 4 c 39 (32–40), ps 1 29 (26–29), ps 2 25 (23–25), ps 3 4 (4–5). Legs ( Figs. 3 View FIGURE 3 , 4 View FIGURE 4 ). Leg I setation ( Fig. 3 View FIGURE 3 A): Tr-1, Fe- 2, Ge-4, TiTa-16(4). Tibiotarsus with large tarsal claw, pointing at apices. Seta k smooth, blunt-ended, eupathidion tc” situated on long pinnaculum. Lengths of solenidia: ω 1 11 (9–11)> ω 2 7 (6–7) = φ 1 7 (7–8)> φ 2 8 (7–8); ω 2 and φ 2 baculiform, φ 1 clavate, ω 1 finger-shaped. Seta dFe thickened and pointed. Setae l’ of femur blunt-ended and smooth. Leg II setation ( Fig. 3 View FIGURE 3 B): Tr-1, Fe-3, Ge-3, Ti-4(1), Ta-6(1). Tarsus with large padded claws and welldeveloped flipper-like empodium. Solenidion ω 7 (7–8) finger-shaped, solenidion φ weakly clavate. Seta l’ of femur very short, spine-like. Seta pl” spine-like, smooth, u’ blunt-ended and barbed in distal half. Leg III setation ( Fig. 4 View FIGURE 4 A): Tr-1, Fe-2, Ge-2, Ti-4(1), Ta-6. Claws of same shape as on tarsus II. Solenidion φ weakly clavate. Setae pl” spine-like, weakly barbed, u’ blunt-ended and barbed in distal half. Leg IV setation ( Fig. 4 View FIGURE 4 B): Tr-1, Fe-2, Ge-1, TiTa-7. Setae d of femur, d and tc” of tibiotarsus blunt-ended. Tibiotarsus short, only slightly longer than its width. Setae tc” smooth or with few small barbs, distinctly shorter than seta d of tibiotarsus.

MALE and LARVA unknown.

Type material. Female holotype, slide VS 300714 and 2 female paratypes, RUSSIA: Tyumen Province, Tyumen region, vicinity of settlement Narimanovo, 57o21′56″ N, 65o08′21″ E, on ants Lasius niger (Linnaeus) , 30 July 2014, coll. V.A. Stolbov; 4 female paratypes, RUSSIA: Tyumen Province, Tyumen region, vicinity of settlement Reshetnikovo, 57°17'00.2" N, 65°24'32.5" E, on ants Lasius niger , 25 September 2014, coll. T.A. Tarakanov; 3 female paratypes same locality and date from ants Lasius flavus Fabricius.

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 Lasius .

Differential diagnosis. Female of the new species is most similar to S. tertius Ebermann and Moser, 2008 described from the U.S.A. ( Ebermann & Moser 2008) by the presence of secondary sclerotized lines on the poststernal and aggenital plates, similar lengths of dorsal and ventral idiosomal setae and shape of the anterior genital sclerite. It differs from S. tertius by setae c 1 and c 2 distinctly barbed and blunt-ended (vs. c 1 and c 2 pointed and with only few weak barbs in S. tertius ), distance 4 a –4 a subequal to distance 4 a –4 b (distance 4 a –4 a about 2 times longer than 4 a –4 b), solenidia ω 2 and φ 2 subequal (vs. solenidion ω 2 almost 2 times shorter than φ 2). Among Palaearctic species, S. lasiophilus sp. nov. is most similar to S. myrmecophilus Metwali, 1981 by the presence of a secondary transverse sclerotized line on the aggenital plate. It differs from S. myrmecophilus by the presence of a secondary transverse sclerotized line on the poststernal plate (vs. absent in S. myrmecophilus ) and by distinctly longer dorsal hysterosomal setae, 27–33 long (vs. 15–17).