Eueremaeus badzhalensis Ermilov et Ryabinin, 2020

Ermilov, S. G. & Ryabinin, N. A., 2020, A NEW SPECIES OF THE GENUS EUEREMAEUS MIHELČIČ, 1963 (ACARI: ORIBATIDA: EREMAEIDAE) FROM THE RUSSIAN FAR EAST, Far Eastern Entomologist 409, pp. 14-20 : 15-19

Eueremaeus badzhalensis Ermilov et Ryabinin , sp. n.

http://zoobank.org/NomenclaturalActs/ 9260FC17-FF25-41B3-8C43-9EDCE8433292

Figs 1–17

MATERIAL EXAMINED. Holotype – ♀, Russia: Khabarovskii krai, Verkhnebureinsky

District , Badzhalsky Range near Mogdy River, 50.516599 o N, 133.856580 o E, deciduous forest with larch, spruce, alder, cedar elfin, ledum, cowberry and mosses ( Sphagnum sp. ), in decaying moss near spruce, 4.VII 1987, leg. N.A. Ryabinin. Paratypes: 9 ♀, the same label as holotype. All specimens are preserved in ethanol with a drop of glycerol .

TYPE DEPOSITION. The holotype is deposited in the collection of the Senckenberg

Institute , Görlitz, Germany. Nine paratypes are deposited in the collection of the Tyumen

State University Museum of Zoology, Tyumen, Russia.

DIAGNOSIS. Body size 713–796 × 398–464. Body foveolate. Prodorsum with costulae,

transcostula, lateral carinae, tutoria and enantiophyses. Rostral and lamellar setae long, setiform, barbed. Interlamellar setae of medium size, thickened, erect, barbed. Bothridial setae short, with globular, barbed heads.Notogastral setae of medium size, setiform, barbed. Epimeres with setal formula 3-1-3-3. Three pairs of anal and three pairs of adanal setae present. Postanal process triangular. Leg trochanters III and IV with triangular anterodorsal processes. Leg companion setae d on tibia I–IV and on genua I–III present.

DESCRIPTION. Female. Body length 796 (holotype), 713–796 (nine paratypes); body width 464 (holotype), 398–464 (nine paratypes) .

Integument ( Figs 1–5 , 8–17 ). Body brown. Dorsal, lateral and ventral sides, genital and anal plates, subcapitular mentum and genae, and leg femora I–IV and trochanters III and IV densely foveolate (diameter of foveolae up to 10). Subcapitular rutelli slightly striate. Body and legs covered with covering layer of gel-like cerotegument, including microgranules and bacillar structures.

Note: Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = famulus);

d φ and d σ – seta and solenidion coupled, l’ * – seta present or absent; single prime (’) marks setae on anterior and double prime (”) setae on posterior side of the given leg segment;

parentheses refer to a pair of setae.

Prodorsum ( Figs 1 , 3 , 12, 14–17 ). Rostrum broadly rounded. Costulae long, parallel, with minute cusps. Transcostula and additional carinae (lateral to costular cusps) well developed.

Tutoria ridge-like, with abrupt posterior ends, opposing separate tubercles to form prodorsal enantiophyses. Rostral (61–69) and lamellar (82–94) setae setiform, barbed, le inserted on costular cusps. Interlamellar setae (49–57) thickened, erect, barbed. Exobothridial setae (20)

setiform, thin, roughened. Bothridial setae (41–45) with short, smooth stalk and short,

globular, barbed heads.

not shown); 4 – posterior view; 5 – subcapitulum, ventral view; 6 – palp, right, paraxial view;

7 – chelicera, left, paraxial view. Scale bar 100 μm (3, 4), scale bar 50 μm (5, 7), scale bar 20

μm (6).

Notogaster ( Figs 1–4 , 12–14, 17 ). Anterior margin convex medially. Ten pairs of notogastral setae (57–69) setiform, barbed. Lyrifissures ia, im, ip, ih and ips distinct. Opisthonotal glands openings not evident.

Gnathosoma ( Figs 5–7 , 13 ). Subcapitulum longer than wide (176–184 × 132–138). Three pairs of subcapitular setae (a and h, 32–36; m, 41–45) and two pairs of adoral setae (16–20)

setiform, barbed. Palps (102–106) with typical setation 0–2–1–3–9(+ω). Solenidion of palptarsi short, bacilliform, distally pressed to tubercle bearing seta acm. Postpalpal setae (8)

spiniform, roughened. Axillary sacculi not evident. Chelicerae (176–184) with two setiform,

barbed setae (cha, 57–61; chb, 30–32).

Epimeral and lateral podosomal regions ( Figs 2 , 3 , 13, 14 ). Epimeres with setal formula

3-1-3-3. Setae (1a, 2a, 3a, 28–32; others 36–41) setiform, barbed. The second pair of setae on epimeres II completely absent. Discidia triangular.

Anogenital region ( Figs 2–4 , 13, 14 ). Six pairs of genital (30–32), one pair of aggenital

(30–32), three pairs of anal (41–45) and three pairs of adanal (41–45) setae setiform, barbed.

Adanal lyrifissures located close and parallel to anal plates. Postanal process well developed,

triangular. Posteromarginal sclerite poorly visible.

Legs ( Figs 8–11 , 12–14 ). Tridactylous, claws of all legs strong, similar in size, barbed on dorsal sides. Ventroparaxial porose areas on femora I–IV and on trochanters III and IV,

proximoventral porose areas on tarsi I–IV and distoventral porose areas on tibiae I–IV slightly developed. Tibia I and II with anterodorsal apophyses. Trochanters III and IV with triangular anterodorsal processes. Formulas of leg setation and solenidia: I (1–5–4–5–20) [1–

2–2], II (1–5–4–5–17) [1–1–1], III (2(or 3)–3–2–4–15) [1–1–0], IV (1–2–2–4–12) [0–1–0];

homologies of setae and solenidia indicated in Table 1. Setae p on tarsi II–IV and u on tarsi

I–IV shortly ciliate. Companion setae d on tibia I–IV and on genua I–III present.

ETYMOLOGY. The species name badzhalensis refers to the place of origin, Badzhalsky

Range (Khabarovskii krai, Russia).

REMARKS. The new species belongs to the trionus -group (Behan-Pelletier, 1993),

which comprises Eueremaeus -species with three pairs of anal and three pairs of adanal setae.

The distinctive characters of these species can be found in an identification key below.

13 – ventral view; 14 – lateral view; 15 – transcostula and distal parts of costulae; 16 – basal part of prodorsum, lateral view; 17 – basal part of prodorsum and anterior part of notogaster,

left half, dorsal view. Scale bar 200 μm (12–14), scale bar 50 μm (15–17).

Figures

Figs 1–2. Eueremaeus badzhalensis sp. n., adult: 1 – dorsal view (legs not shown); 2 – ventral view (gnathosoma and legs not shown). Scale bar 100 μm.

Figs 3–7. Eueremaeus badzhalensis sp. n., adult: 3 – lateral view (gnathosoma and legs

Figs 8–11. Eueremaeus badzhalensis sp. n., adult: 8 – leg I, right, antiaxial view; 9 – leg II, right, antiaxial view; 10 – leg III, right, antiaxial view; 11 – leg IV, right, antiaxial view. Scale bar 50 μm.

Figs 12–17. Eueremaeus badzhalensis sp. n., adult, SEM micrographs: 12 – dorsal view;