Angulobaloghia scrobia, Kontschán & Starý, 2011

Kontschán, Jenő & Starý, Josef, 2011, Uropodina species from Vietnam (Acari: Mesostigmata), Zootaxa 2807, pp. 1-28 : 22

Angulobaloghia scrobia sp. nov.

( Figs 58–60 )

Material examined. Holotype. Female ( HNHM). Vietnam, Da Lat, Cam Ly area, moss sample from a fallen tree trunk in the rain-forest, 8 December 1994, S. Mahunka, Gy. Sziráki and L. Zombori coll.

Description. Female. Length of idiosoma 340 μm, width 270 μm (n=1). Shape circular, posterior margin rounded.

Dorsal idiosoma ( Fig. 58 ). Marginal and dorsal shields fused. Dorsal setae marginally pilose. Dorsal idiosoma covered by small oval pits.

Ventral idiosoma ( Fig. 59 ). Sternal and ventral shields without sculptural pattern. All sternal setae smooth and needle-like, St1 at mid-level of coxae II, ca 8 μm long, St2 at level of anterior margin of coxae III, ca 15 μm, St3 at level of posterior margin of coxae III, as long as St2, St4 at level of anterior margin of coxae IV, ca 8 μm long. Ventral setae smooth except V6 with one pair of lateral spines, V2 ca 9 μm long, V7 and ad ca 32–34 μm, V8 ca 20 μm long. V2 near posterior end of genital shield, V6 near edges of genital shield, V8 near fossula tarsales, setae ad situated on small protuberances lateral to anal opening, V7 placed between V8 and ad. One pair of lyrifissures situated near posterior area of coxae IV. Stigmata situated between coxae II and III. Peritremes hook-shaped. Genital shield narrow, long and subtriangular, surface covered by oval pits, its apical margin serrate. Base of tritosternum narrow, vase-like, tritosternal laciniae smooth, subdivided into two short lateral brances and one long central point ( Fig. 60 ).

Gnathosoma ( Fig. 60 ). Corniculi horn-like, internal malae short and smooth. Hypostomal setae h1 not clearly visible, h2 needle-like, ca 13 μm long, h3 and h4 smooth, needle-like, ca 10–11 µm long. Apical part of epistome marginally pilose. Chelicerae not clearly visible.

Etymology. The name of the new species is from the Latin word ‘scrobia’ and refers to the pitted surface of the dorsal idiosoma.

Remarks. The new species is known from the female holotype only and more collections are needed from the type locality, but the differences between the previously known and A. scrobia are enough to define it as new species. The shape of the genital shield of the female is similar to that of A. aokii (Hiramatsu) , but the other Angulobaloghia species have different genital shield ( Kontschán 2010b). The ventral shield is ornamented by oval pits in A. aokii , while the new species has a smooth ventral shield, V6 setae are smooth in A. aokii , but V6 with lateral spines in the new species.

Figures

FIGURES 58 – 60. Angulobaloghia scrobia sp. nov., female. 58, dorsal view; 59, ventral view; 60, ventral view of gnathosoma, coxae I and tritosternum. (scale bar: a: 100 μm, b: 50 μm).