Galumna (Neogalumna) tolstikovi, Ermilov, Sergey G. & Anichkin, Alexander E., 2014

Ermilov, Sergey G. & Anichkin, Alexander E., 2014, Taxonomic study of oribatid mites (Acari, Oribatida) of Bi Dup — Nui Ba National Park (southern Vietnam), Zootaxa 3834 (1), pp. 1-86 : 77-82

Galumna (Neogalumna) tolstikovi sp. nov.

( Figures 54–57 )

With characters of the genus Galumna as summarized by Ermilov et al. (2013 d) and subgenus Galumna (Neogalumna) as summarized by Hammer (1973) for the genus Neogalumna .

Diagnosis. Body size 381–415 × 265–298. Rostral and lamellar setae of medium size, interlamellar setae short. Bothridial setae setiform, ciliate. Lamellar lines straight, short. Four pairs of porose areas oval or circular. Median pore absent. Medial part of genital plates with longitudinal stria. Postanal porose area oval.

Description. Measurements. Body length 398 (holotype: female), 381–415 (four paratypes: three females and one male); body width 282 (holotype), 265–298 (four paratypes).

Integument. Body color yellowish-brown. Body surface smooth. Pteromorphs with weakly developed radiate wrinkles. Medial part of genital plates with longitudinal stria.

Prodorsum. Rostrum widely rounded. Rostral and lamellar setae of medium size (both 20–24), setiform, slightly barbed. Interlamellar setae short (4–6), thin, smooth. Bothridial setae (118–131) longest on prodorsum, setiform, ciliate. Exobothridial setae absent. Lamellar and sublamellar lines distinct. Lamellar lines straight, short, clearly not reaching insertions of rostral setae. Sublamellar lines typical for Galumna : long, curving backwards. Porose areas Ad oval, transverse, elongate (20 × 4–8).

Notogaster. Anterior notogastral margin developed. Dorsophragmata small. Notogastral setae represented by ten pairs (additionally c x present) of alveoli (eleventh pair located on pteromorphs). Four pairs of porose areas (Aa, 20–32 × 12–20, oval; A1, 16 × 10–12, oval or 6–10, circular; A2, 6–12, circular; A3, 8–20 × 6–12, oval or 6–16, circular), with distinct borders. Alveoli of setae la located posteriorly to Aa. Lyrifissures im located between lm and A1. Opisthonotal gland openings located laterally to A1. Median pore absent in all specimens.

Gnathosoma. Subcapitulum longer than wide (102–106 × 98). Subcapitular setae setiform; a (20–24) and m (16–20) slightly barbed, h (4–8) smooth. Two pairs of adoral setae (8–12) setiform, slightly barbed. Palps (82) with setation 0–2–1–3–9(+ω). Solenidion little longer than half of palptarsus length, straight, thickened, blunt-ended, attached to eupathidium. Chelicerae (110–123) with two barbed setae; cha (32–41) longer than chb (20–28). Trägårdh’s organ distinct.

Epimeral and lateral podosomal regions. Apodemes (1, 2, sejugal, 3) well visible. Four pairs of thin, smooth epimeral setae observed ventrally; 3b (12–16) little longer than 1a, 4a, 4b (6–12). Discidia triangular, pointed. Circumpedal carinae distinct.

Anogenital region. Six pairs of genital, one pair of aggenital, two pairs of anal and three pairs of adanal setae similar in length (6–12), thin, smooth. Anterior edge of genital plates with two setae. Adanal lyrifissures iad located antero-laterally to adanal setae ad 3. Postanal porose area oval (20–24 × 12–14).

Legs. Tridactylous; claw of each leg smooth. Formulae of leg setation and solenidia: I (1–4–3–4–20) [1–2–2], II (1–4–3–4–15) [1–1–2], III (1–2–1–3–15) [1–1–0], IV (1–2–2–3–12) [0–1–0]; homologies of setae and solenidia indicated in Table 12.

Type material. Collection data for holotype (female): locality 6 (soil); collection data for four paratypes (three females and male): locality 5 (soil).

Type deposition. The holotype is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; three paratypes are deposited in the collection of the Siberian Zoological Museum, Novosibirsk, Russia; one paratype is deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia.

Etymology. The specific name is dedicated to our colleague, acarologist, Dr. Andrei V. Tolstikov (Tyumen State University, Tyumen, Russia).

Remarks. In having the combination of the short and straight lamellar lines, setiform and ciliate bothridial setae, presence of anterior margin of notogaster, presence of four pairs of circular or oval porose areas and striate medial parts of genital plates, Galumna (Neogalumna) tolstikovi sp. nov. is similar to Galumna (Neogalumna) seniczaki ( Ermilov & Anichkin, 2010) from Vietnam. However, it clearly differs from the latter by the presence of short (4–6) interlamellar setae (versus long, 69–77 in G. (N.) seniczaki ).

Figures

FIGURE 54. Galumna (Neogalumna) tolstikovi sp. nov., adult: A—dorsal view; B—lateral view of prodorsum and anterior part of notogaster (gnathosoma and legs I, II not illustrated). Scale bar 100 Μm.

FIGURE 55. Galumna (Neogalumna) tolstikovi sp. nov., adult: A—ventral view (gnathosoma and legs not illustrated); B—posterior view of notogaster and postanal porose area. Scale bar 100 Μm.

FIGURE 56. Galumna (Neogalumna) tolstikovi sp. nov., adult: A—pteromorph; B—bothridial seta; C—porose area Aa; D—porose area A 1; E—porose area A 2; F—porose area A 3; G—porose area Ap; H—subcapitulum, right half, ventral view; I—genu, tibia and tarsus of palp; J—chelicera; K—pedotectum II, discidium and epimeral seta 3 b; L—genital plate, left; M—anal plate, left, and adanal setae. Scale bar (A) 50 Μm; scale bar (B – G, I) 10 Μm; scale bar (H, J, K) 20 Μm.

FIGURE 57. Galumna (Neogalumna) tolstikovi sp. nov., adult: A—leg I, without trochanter, left, antiaxial view; B—leg IV, left, antiaxial view. Scale bar 20 Μm.