Allogalumna (Allogalumna) paramachadoi, 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 : 66-71

Allogalumna (Allogalumna) paramachadoi sp. nov.

( Figures 46–49 )

With characters of the genus Allogalumna Grandjean, 1936 as summarized by Ermilov et al. (2013 d).

Diagnosis. Body size 332–348 × 249–265. Anterior part of prodorsum with very large apophysis. Prodorsal setae long: rostral setae densely ciliate; lamellar and interlamellar setae barbed. Bothridial setae setiform, ciliate. Anterior notogastral margin not developed. Four pairs of rounded or oval porose areas present. Median pore developed, located between porose areas A1. Adanal setae ad 3 inserted posteriorly to lyrifissures iad. Postanal porose area oval.

Description. Measurements. Body length 332 (holotype: female), 332, 348 (two paratypes: one female and one male); body width 249 (holotype), 249, 265 (two paratypes).

Integument. Body color yellowish-brown. Body surface smooth. Pteromorphs with weakly developed radiate wrinkles. Some stria located around of the genital and anal apertures.

Prodorsum. Anterior part of prodorsum with very large apophysis (pap). Rostrum widely rounded. Rostral setae (41–45) setiform, densely ciliate unilaterally. Lamellar (53–61) and interlamellar (82–90) setae setiform, barbed. Bothridial setae (127–147) longest on prodorsum, setiform, with cilia unilaterally. Exobothridial setae absent. Sublamellar lines (S) distinct, typical for Allogalumna : long, curving backwards. Porose areas Ad oval, transverse, elongate (18–20 × 4–6).

Notogaster. Anterior notogastral margin not developed. Dorsophragmata small. Notogastral setae represented by nine pairs of alveoli (tenth pair located on pteromorphs). Four pairs of porose areas of medium size, circular or oval (Aa, 14–20 × 12–16; A1, 10–14 × 8–12; A2, 8–18 × 10–12; A3, 8–14 × 8–12), with distinct borders. Alveoli of setae la inserted posteriorly to Aa. Lyrifissures im located between lm and A1. Opisthonotal gland openings located laterally to A1. Median pore (mp) present in all specimens, located between porose areas A1.

Gnathosoma. Subcapitulum longer than wide (90 × 82). Subcapitular setae setiform; a (18–20) slightly barbed, m (10–12) and h (14) smooth. Two pairs of adoral setae (12) setiform, slightly barbed. Palps (69) with setation 0–2–1–3–9(+ω). Solenidion little longer than half of palptarsus length, straight, thickened, blunt-ended, attached to eupathidium. Chelicerae (102–106) with two barbed setae; cha (32) longer than chb (20). 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 (16–20) longer than 1a, 4a, 4b short (8–10). 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 little differs in size (10–14), thin, smooth. Anterior edge of genital plates with three setae. Adanal setae ad 3 inserted posteriorly to lyrifissures iad. Postanal porose area (Ap) oval (l2–14 × 8–10).

Legs. Tridactylous; claws 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.

Leg Trochanter Femur Genu Tibia Tarsus

I v' d, (l), bv'' (l), v', σ (l), (v), φ1, φ2 (ft), (tc), (it), (p), (u), (a), s, (pv), v', (pl), l'', e, ω1, ω 2 II v' d, (l), bv'' (l), v', σ (l), (v), φ (ft), (tc), (it), (p), (u), (a), s, (pv), ω1, ω 2 III v' d, ev' l', σ l', (v), φ (ft), (tc), (it), (p), (u), (a), s, (pv) IV v' d, ev' d, l' l', (v), φ ft'', (tc), (p), (u), (a), s, (pv)

See Table 2 for explanations.

Type material. Collection data for holotype (female): locality 4 (soil); collection data for: locality 6 (soil).

Type deposition. The holotype is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; one paratype in 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 “ paramachadoi ” refers to the similarity between the new species and the species Acrogalumna machadoi Balogh, 1960 .

Remarks. The genus Allogalumna comprises more than 30 species having a cosmopolitan distribution (data summarized by Subías 2004, updated 2014) collectively.

In having the combination of small body size, long rostral, lamellar and interlamellar setae, setiform and ciliate bothridial setae, absence of anterior margin of notogaster and presence of four pairs of rounded porose areas, Allogalumna (Allogalumna) paramachadoi sp. nov. is similar to Acrogalumna machadoi Balogh, 1960 (see also Engelbrecht 1972) from the Ethiopian region and India. However, it clearly differs from the latter by the presence of ciliate rostral setae (versus slightly barbed in Aс. machadoi ), prodorsal apophysis (versus absent in Aс. machadoi ) and medial pore (versus absent or several pores present in Aс. machadoi ) and localization of adanal setae ad 3 posteriorly to lyrifissures iad (versus anteriorly or antero-laterally in Aс. machadoi ).

In having the combination of setiform and ciliate bothridial setae, absence of anterior margin of notogaster and presence of four pairs of rounded porose areas, Allogalumna (Allogalumna) paramachadoi sp. nov. is similar to Allogalumna (Allogalumna) costata Mahunka, 1996 from Madagaskar. However, it clearly differs from the latter by the smaller body size (332–348 × 249–265 versus 542–598 × 403–445 in A. (A.) costata ), presence of ciliate rostral setae (versus barbed in A. (A.) costata ), long interlamellar setae (versus represented by alveoli in A. (A.) costata ), prodorsal apophysis (versus absent in A. (A.) costata ), medial pore (versus absent in A. (A.) costata ), localization of adanal setae ad 3 posteriorly to lyrifissures iad (versus antero-laterally in A. (A.) costata ) and smooth genital and anal plates (versus striate in A. (A.) costata ).

Figures

FIGURE 46. Allogalumna (Allogalumna) paramachadoi sp. nov., adult: A—dorsal view; B—lateral view of prodorsum and anterior part of notogaster (lgnathosoma and legs I, II not illustrated). Scale bar 100 Μm.

FIGURE 47. Allogalumna (Allogalumna) paramachadoi sp. nov., adult: A—ventral view (gnathosoma and legs not illustrated); B—posterior view of notogaster. Scale bar 100 Μm.

FIGURE 48. Allogalumna (Allogalumna) paramachadoi sp. nov., adult: A—rostrum; B—pteromorph; C—bothridial seta; D—porose area Aa; E—porose area A 1; F—porose area A 2; G—porose area A 3; H—porose area Ap; I—subcapitulum, right half, ventral view; J—genu, tibia and tarsus of palp; K—chelicera; L—epimeral seta 3 b; M—genital plate, right; N—anal plate, right, and adanal seta ad 3. Scale bar (A, B) 50 Μm; scale bar (C, I, K – N) 20 Μm; scale bar (D – H, J) 10 Μm.

FIGURE 49. Allogalumna (Allogalumna) paramachadoi sp. nov., adult: A—leg I, without trochanter, left, antiaxial view; B—leg IV, left, antiaxial view. Scale bar 20 Μm.