Galumnella paracellularis, Ermilov & Starý, 2018

Ermilov, Sergey G. & Starý, Josef, 2018, New Galumnoidea (Acari, Oribatida) from Hanoi (Northern Vietnam), Zootaxa 4379 (4), pp. 497-516 : 510-515

Galumnella paracellularis sp. nov.

( Figs 21–31 )

Diagnosis. Body size: 340–365 × 257–265. Body surface heavily microfoveolate, prodorsum, notogaster and anogenital region with reticulate pattern. Rostrum triangular. Lamellar and sublamellar lines parallel, curving backwards, L very thick, S thin. Rostral and lamellar setae short, setiform, indistinctly barbed, interlamellar setae minute, ro thickest, in thinnest. Bothridial setae with unilaterally dilated, barbed head having short, thin apex. Notogastral setae short, thin, smooth. Median pore absent. Epimeral and anogenital setae short, setiform, in general smooth. Postanal porose area rounded. Leg tarsi with one claw.

Description. Measurements. Body length: 365 (holotype: female), 340–365 (five paratypes: three females and two males); notogaster width: 265 (holotype), 257–265 (five paratypes).

Integument ( Figs 21–25 ). Body color dark brown. Body surface (including pteromorphs, genital and anal plates, subcapitular mentum) heavily microfoveolate (diameter of foveoles up to 2). Prodorsum (except anterior and basal parts), notogaster and anogenital region with reticulate pattern (cells of different size). Region near to genital aperture slightly striate.

Prodorsum ( Figs 21–24 ). Rostrum triangular (visible in anterior view). Anterior part of prodorsum with slightly dilated median ridge, basal part slightly convex. Lamellar and sublamellar lines parallel, curving backwards, L very thick, S thin. Inner lobe tooth poorly visible, prodorsal leg niches and lateral ridges T (E absent) of prodorsum well-developed. Rostral (20) and lamellar (8–10) setae setiform, indistinctly barbed. Interlamellar setae (4) setiform, thin, smooth. Bothridial setae (98–102) with long stalk and shorter, unilaterally dilated, barbed head having short, thin apex. Exobothridial setae and their alveoli absent. Sejugal porose areas very small, rounded (4), located posterolateral to in.

Notogaster ( Figs 21–23 , 25 ). Dorsosejugal suture slightly convex medially. Dorsophragmata elongated longitudinally, strongly distanced from dorsosejugal suture. With 10 pairs of short, thin, smooth setae (lp, h 1– h 3, 6– 8; others, 4) and one pair of vestigial dorsolateral pores. Median pore absent in both sexes. All lyrifissures distinct, im located between la and h 3, ip anterolateral to p 1, ih and ips distanced from each other, anterior to p 3. Opisthonotal gland openings posterolateral to h 3.

Gnathosoma ( Figs 26–28 ). Subcapitulum longer than wide: 106–114 × 45–49. Three pairs of subcapitular setae setiform, smooth, a (32–36) longer and thicker than m (14–16) and h (16–18). Length of palps: 69–77. Postpalpal setae (8) spiniform. Axillary saccules distinct, elongated. Length of chelicerae: 188–200. Cheliceral setae cha (24) setiform, barbed, chb minute (2). Trägårdh’s organ of chelicerae long, elongate triangular.

Epimeral and lateral podosomal regions ( Figs 22 , 23 ). Anterior margin of epimere I without ledge, smooth. Pedotecta I broadly rounded, pedotecta II quadrangular, rounded distally in ventral view. Discidia triangular, rounded distally. Circumpedal carinae thick, long, directed to Pd I. Epimeral setal formula: 1–0–2–3. Epimeral setae setiform, 3b, 3c and 4c (12–14) barbed, longer than smooth 1a, 4a and 4b (4).

Anogenital region ( Figs 22 , 23 , 25 ). Six pairs of genital (g 1, 12–14; g 2, 6; g 3– g 6, 4), one pair of aggenital (4), two pairs of anal (4) and three pairs of adanal (4) setae setiform, smooth. Anterior edges of genital plates with three setae. Aggenital setae inserted between genital and anal apertures, equal distanced from them. Adanal lyrifissures located close and anterior to anal plates. Adanal setae ad 1 postanal, ad 2 and ad 3 paraanal. Distance ad 1– ad 2 similar to ad 2– ad 3. Unpaired postanal porose area rounded (4).

Legs ( Figs 29–31 ). Monodactylous, claw of tarsi strong, slightly barbed on dorsal side. Femora II with triangular ventral tooth. Porose areas on all femora and on trochanters III, IV well visible. Formulas 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. Famulus on tarsi I inserted between solenidia ω1 and ω2. Solenidion of tibiae IV inserted in anterior part of the segment.

Type deposition. The holotype (ethanol with drop of glycerol) is deposited in TSUMZ. Five paratypes (ethanol with drop of glycerol) are deposited in SMNH.

Etymology. The specific name paracellularis refers to the similarity of the new species to the species Galumnella cellularis Balogh & Mahunka, 1967 .

Remarks. In general morphological traits (bothridial setae with unilaterally dilated head; body microfoveolate; notogaster, pteromorphs and anogenital region reticulate), Galumnella paracellularis sp. nov. is morphologically most similar to Galumnella cellularis Balogh & Mahunka, 1967 from Vietnam, but differs by the larger body size (340–365 × 257–265 vs. 275 × 190) and reticulate prodorsum (vs. not reticulate).

Note: Roman letters refer to normal setae, Greek letters refer to solenidia (except ɛ = famulus). Single prime (’) marks setae on the anterior and double prime (”) setae on the posterior side of a given leg segment. Parentheses refer to a pair of setae.

Figures

FIGURE 21. Galumnella paracellularis sp. nov., adult: dorsal view.Scale bar 45 µm.

FIGURE 22. Galumnella paracellularis sp. nov., adult: ventral view (gnathosoma and legs not shown). Scale bar 45 µm.

FIGURES 23–24. Galumnella paracellularis sp. nov., adult:23—lateral view (pteromorph, gnathosoma and legs not shown); 24—anterior part of prodorsum, anterior view.Scale bar 45 µm.

FIGURES 25–28. Galumnella paracellularis sp. nov., adult: 25—posterior view; 26—subcapitulum, ventral view; 27— chelicera, right, antiaxial view; 28—palp, right, antiaxial view.Scale bars 45 µm (25), 17 µm (26, 27; 28).

FIGURES 29–31. Galumnella paracellularis sp. nov., adult: 29—leg I, left, paraxial view; 30—femur of leg II, left, paraxial view; 31—leg IV, left, antiaxial view.Scale bar 17 µm.