Galumna (Galumna) parakazakhstani Ermilov et Anichkin, 2014

Ermilov, Sergey G. & Anichkin, Alexander E., 2014, A new species ofGalumna (Galumna) (Acari, Oribatida, Galumnidae) from Vietnam, Ecologica Montenegrina 1 (1), pp. 9-14 : 10-13

Galumna (Galumna) parakazakhstani Ermilov et Anichkin sp. nov.

( Figures 1–2 )

Diagnosis. Body size 647–664 × 448–464. Body surface microfoveolate (visible under high magnification). Rostral, lamellar, interlamellar and bothridial setae setiform. Anterior notogastral margin not developed or indistinctly visible. Four pairs of porose areas present: Aa wedge-shaped, other porose areas oval. Genital and aggenital setae smooth, anal and adanal setae barbed. Postanal porose area elongate, thin.

Description

Measurements. Body length: 664 (holotype), 647–664 (seven paratypes: six females and one male); notogaster width: 448 (holotype), 448–464 (seven paratypes).

Integument. Body color brown. Body surface microfoveolate (visible under high magnification in dissected specimens, ×1000). Pteromorphs with weakly developed radiate wrinkles.

Prodorsum. Rostrum widely rounded. Rostral setae (ro, 73–82) setiform, barbed unilaterally. Lamellar (le, 98–110) and interlamellar (in, 110–123) setae longer, setiform, barbed. Bothridial setae (ss, 164–172) longest on prodorsum, setiform, thickened, with short cilia unilaterally. Exobothridial setae absent. Lamellar (L) and sublamellar (S) lines distinct, typical for majority species of Galumna (Galumna) : parallel, long, curving backwards. One pair of porose areas Ad (41–45 × 6–8) oval, elongate, located postero-laterally to interlamellar setae.

Notogaster. Anterior notogastral margin not developed or indistinctly visible. Dorsophragmata (D) of medium size, elongate. Notogastral setae represented by 10 pairs of alveoli. Four pairs of porose areas present: Aa (86–90 × 28–36, width measured in broadest part, wedge-shaped, transversely oriented, elongate; A1 (20–36 × 16–20), A2 (32–41 × 16–20) and A3 (32–41 × 16–24) oval, with distinct borders. Right porose area Aa divided into two part, lateral triangular and medial oval, in two paratypes. Alveoli of setae la inserted posteriorly to Aa. Lyrifissures im and opisthonotal gland openings (gla) located laterally to A1. Median pore present, located in posterior part of notogaster below the virtual line connecting A1–A1.

Gnathosoma. Generally, morphology of subcapitulum, palps and chelicerae typical for most Galumnidae (for example, see Ermilov and Anichkin 2010, 2011; Ermilov et al. 2011). Subcapitulum longer than wide (151 × 143). Subcapitular setae setiform, similar in length (28–32); h distinctly barbed, m and a slightly barbed, m thinner than other. One pair of adoral setae (or 1, or 2, 16–20) setiform, barbed, hook-like distally. Palps (118) with setation 0–2–1–3–9(+ω). Solenidion little longer than half of palptarsus length, straight, thickened, blunt-ended, attached to eupathidium. Chelicerae (192) with two barbed setae; cha (57) longer than chb (32). Trägårdh’s organ distinct.

Epimeral and lateral podosomal regions. Apodemes (1, 2, sejugal, 3) well visible. Four pairs of epimeral setae observed ventrally; 3b (16–20) longer than 1a, 4a, 4b (8–12), all thin, smooth. Discidia (dis) triangular, circumpedal carinae (cp) distinct.

Anogenital region. Six pairs of genital (g 1 – g 3, 16–20; g 4 – g 6, 8–12) and one pair of aggenital (ag, 8– 12) setae setiform, thin, smooth. Anterior edge of genital plates with three setae. Two pairs of anal (an 1, an 2) and three pairs of adanal (ad 1 – ad 3) setae similar in length (16–20), setiform, thicker than genito-aggenital setae, straight, barbed. Adanal setae ad 3 inserted laterally to adanal lyrifissures iad. Postanal porose area (Ap) elongate, thin (98–110 × 6–12).

Legs. Three claws of each leg smooth. Generally, morphology of leg segments, setae and solenidia typical for most Galumnidae (for example, see Ermilov and Anichkin 2010, 2011; Ermilov et al. 2011). 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]; homology of setae and solenidia indicated in Table 1 .

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 ; four paratypes are deposited in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia .

Etymology. The prefix para is Latin meaning “near” and refers the similarity between the new species and the species Galumna (Galumna) kazakhstani Krivolutskaya, 1952 .

Comparison. In having the setiform bothridial setae, well developed interlamellar setae, presence of four pairs of notogastral porose areas, Galumna (Galumna) parakazakhstani sp. nov. is most similar to Galumna (Galumna) kazakhstani Krivolutskaya, 1952 from the southern Palaearctic region. However, the new species clearly differs from the latter by the larger body size (647–664 × 448–464 versus 540 × 420), bothridial setae unilaterally barbed (versus heavily barbed and only in anterior part in G. (G.) kazakhstani ), anterior notogastral margin absent or indistinctly visible (versus well developed G. (G.) kazakhstani ), notogastral porose areas Aa wedge-shaped, elongate (versus triangular in G. (G.) kazakhstani ), and medial pore located below than the virtual line connecting porose areas A1–A1 (versus above in G. (G.) kazakhstani ).

Figures

Figure 1. Galumna (Galumna) parakazakhstani sp. nov.:A — dorsal view;B — ventral view (gnathosoma and legs not illustrated). Scale bar 200µm.

Figure 2. Galumna (Galumna) parakazakhstani sp. nov.:A — lateral view of prodorsum and anterior part of notogaster (gnathosoma and leg I not illustrated);B — posterior view of notogaster;C — pteromorph;D — anterior part of right half of subcapitulum, ventral view;E — left genital plate;F — anterior part of left anal plate. Scale bars (A–C) 100 µm, (D–F) 20µm.