Zygoribatula glabra (Michael, 1890)

Bayartogtokh, Badamdorj & Bae, Yang-Seop, 2024, New findings of poronotic oribatid mites (Acari: Oribatida) from Korea, Zootaxa 5405 (2), pp. 151-184 : 175

Zygoribatula glabra (Michael, 1890)

( Figures 19 & 20C, D )

Measurements. Body length 373–415 µm, width 249–278 µm, length of notogaster 282–315 µm.

Supplementary description. Body colour yellowish-brown, surface of body and leg segments nearly smooth having small granules on lateral part of prodorsum. Rostrum slightly projected in lateral view, but rounded in dorsal view. Rostral seta 50 µm, lamellar seta 64 µm, interlamellar seta 60 µm long, all thin, conspicuously barbed. Exobothridial seta (ex) 43 µm long, thin, smooth. Lamella wide, conspicuously widened anteriorly; translamella wide, straight to slightly convex centrally. Bothridial seta with densely barbed club-shaped head and thin stalk. Bothridium with large openings, its posterior part concealed under anterior margin of notogaster. Notogaster almost circular in dorsal aspect, dorsosejugal suture slightly arched anteriorly; humeral projection conspicuously developed. Thirteen pairs of short, thin, smooth notogastral setae 16–24 µm in length, setae p 1 and p 3 slightly shorter than other notogastral setae. Porose areas small, oval in shape; opisthonotal gland opening (gla) situated posterolateral to lyrifissure im. Subcapitulum wider than long, hypostomal setae short, thin, smooth. Epimeral setae thin, smooth, setal formula: 3–1–3–3. Discidium well developed; circumpedal carina reaching to lateral border of ventral plate. Four pairs of genital, one pair of aggenital, two pairs of anal and three pairs of adanal setae short, thin, smooth. Setae ad 3 and adanal lyrifissure iad situated in preanal position. Legs heterotridactylous, formula of setation: I (1–5–3–4–21); II (1–4–2–4–16); III (2–3–1–3–15); IV (1–2–2–3–12); formula of solenidia: I (1–2–2); II (1–1–2); III (1–1–0); IV (0–1–0).

Material examined. Four males and four females: Mts. Seoraksan , Sockcho, Gangwon Province, Korea, from a mixed forest, soil and litter under oak trees ( Quercus mongolicus ), N38°12’41”, E128°29’10”, 739 m a.s.l., 21 October 2021, Coll. B. Bayartogtokh.

Distribution. Palaearctic region.

Remarks. The most important diagnostic character of the species is the shape of the lamellar and translamellar complex with the seta le clearly distant from lateral edge of the very short, but broad cusps. Morphological characters of the present material are similar to those of specimens studied by Mahunka (1994), Weigmann (2006), Bayartogtokh and Smelyansky (2008), and Seniczak et al. (2012).

Figures

FIGURE 19. Line drawing images of Zygoribatula glabra (Michael, 1890). A—Dorsal view; B—Ventral view of body; C—Lateral view of proterosoma.

FIGURE 20. Compound microscopic images of two species. A & B—Dorsal and ventral views of Neoribates aurantiacus (Oudemans, 1914), respectively; C & D—Dorsal and lateral views of Zygoribatula glabra (Michael, 1890), respectively.