Suctobelbella (Flagrosuctobelba) hastata Pan’kov, 1986

Bayartogtokh, Badamdorj & Bae, Yang-Seop, 2024, New findings of oribatid mites of the genus Suctobelbella (Acari: Oribatida: Suctobelbidae) from Korea, Zootaxa 5556 (1), pp. 226-241 : 231

Suctobelbella (Flagrosuctobelba) hastata Pan’kov, 1986

( Figures 3 , 4 )

Suctobelbella hastata Pan’kov, 1986, p. 1273, figs. a–b.

Suctobelbella (Flagrosuctobelba) hastata : Subías 2009, p. 253.

Measurements. Body length 153–155 μm, width of notogaster 90–92 μm, length of notogaster 101–105.

Supplementary description. Body colour yellowish brown, body surface nearly smooth; anterior part of bothridium, tectopedial region and lateral side of prodorsum with few tubercles. Rostrum incised centrally as seen in dorsal view; with three teeth laterally, first and second teeth separated from each other by deep incision. Tectopedial field rather long, narrowed anteriorly; median prodorsal tubercle subtriangular, with distinct anterior projection. Rostral seta geniculate, ciliate unilaterally in medial part; lamellar and interlamellar setae short, thin, smooth. Bothridial seta long, flagellate, lanceolate, ciliated in distal half. Interbothridial tubercle rounded, with three small tubercles in-between; postbothridial tubercle subtriangular. Interbothridial ridge well developed, with clearly developed anterior projection. Notogaster oval, longer than wide, anterior margin nearly straight. Humeral tubercles relatively large, medial tubercle wider than lateral tubercle, opposite to postbothridial and interbothridial tubercles, respectively. Lenticulus almost circular, with distinct anterior border, situated at level slightly anterior to seta c. Notogastral setae c, la, lm, lp, h 2 and h 3 large, phylliform, smooth; setae h 1, p 1 and p 2 setiform; h 1 conspicuously longer than p 1 and p 2. Lyrifissures im and opisthonotal gland opening clearly developed, other lyrifissures not evident. Subcapitulum longer than wide, subcapitular setae rather long, subequal in size. Apodeme apo.2 strongly developed, posterior margin apo.4 with series of round tubercles; without medial cavity; epimeral setae short, setiform. All anogenital setae thin, smooth; five pairs of genital setae, g 1 slightly longer than other setae; aggenital seta longer that other anogenital setae; anal setae slightly shorter than adanal setae; seta ad 1 inserted posterolateral to anal aperture. Distance ad 3 – ad 3 much shorter than ag–ag. Leg setal formula: I (1-5-2-4-20), II (1-5-2-4-13), III (2-3-1-3-13), IV (1-2-2-3-10); formula of solenidia: I (1-2-2), II (1-1-2), III (1-1-0], IV (0-1-0].

Material examined. Four specimens (females): Gotjawal Park , Seoguipo-shi, Jeju-do, Korea, soil under broad-leaved trees, 25 July 2023, Coll. Y.S. Bae.

Distribution and habitat ecology. This species is confined to relatively small geographic areas, and currently known only from the Russian Far East, Japan and Korea. As for its habitat ecology, this is an inhabitant of the soil and litter of primary and secondary forests composed by various trees.

Remarks. Pan’kov (1986) described this species from the Russian Far East, the character states accord well with those of our material. The only difference we noticed is the body size, which is relatively larger in specimens from Russian Far East than that from Korea (body length 210 vs. 153–155 μm). Chinone (2003) found this species from Japan, which is also slightly different from the Korean materials in the structure of interbothridial tubercle, that is relatively oblong and connected to the interbothridial ridge (in Korean specimens, it is short, not connected to the interbothridial ridge), and relatively long lamellar setae (seta le short in Korean specimens). We consider these differences as intraspecific variations of different populations.

Figures

FIGURE 3. Line drawing images of Suctobelbella (Flagrosuctobelba) hastata Pan’kov, 1986. A—Dorsal view (legs except basal part not illustrated); B—Ventral view (legs except basal part not illustrated); C—Lateral view (gnathosoma, legs and podosomal region not illustrated).

FIGURE 4. Compound microscopic images of Suctobelbella (Flagrosuctobelba) hastata Pan’kov, 1986. A—Dorsal view; B—Ventral view; C—Lateral view; D—Centrodorsal notogastral setae.