Cyllibula ovalis, Kontschán & Starý, 2012

Kontschán, J. & Starý, J., 2012, New Uropodina Species And Records From Malaysia (Acari: Mesostigmata), Acta Zoologica Academiae Scientiarum Hungaricae 58 (2), pp. 177-192 : 178-181

Cyllibula ovalis sp. n.

( Figs 1–10 )

Material examined. Holotype, female. Malaysia, May 2009, Pahang, Cameron Highlands, Tanan Rata village environs, 04°28.52’N, 101°23.02’E, ca. 1500 m, near Parit Fall, sifting of leaf litter, leg. P. Baňař (in HNHM). Paratypes : Four females, two males (in ISB) and four females, two males (in HNHM), locality and date same as in holotype .

Description. Female. Length of idiosoma 1400–1420 µm, width 920–980 µm (n = 9). Shape oval, anterior margin with small vertex, posterior margin rounded.

Dorsal idiosoma ( Figs 1 & 8 ). Dorsal and marginal shields fused close to the anterior margin. All dorsal setae smooth and needle-like (ca. 80–90 µm), dorsal shield covered by oval pits. Pygidial shield present, with some oval pits and bearing one pair of smooth and needle-like setae (ca. 90 µm). Internal margin of marginal shield undulate, setae on marginal shield similar in shape and length to dorsal setae.

Ventral idiosoma ( Figs 2 & 9 ). Sternal shield without ornamentation, St1 short (ca. 20 µm), needle-like and situated near anterior margin of sternal shield. St2, St3, St4 and St5 long (ca. 50–65 µm), St2 placed on level of posterior margin of coxae II, St3 on level of posterior margin of coxae III, St4 near basal edges of genital shield, St5 near to basal line of genital shield. Ventral shields mostly smooth, but reticulate sculptural pattern present near basal edges of genital shield and ornamented by oval pits in caudal area of ventral shield. Ventral shield neotrichous, ventral setae smooth and needle-like (ca. 80–90 µm). Adanal setae similar in shape and length to ventral setae, postanal seta absent. Stigmata situated between coxae II and III, peritremes hook-shaped. Genital shield wide, linguliform, without sculptural pattern and anterior process. Tritosternum with narrow basis, laciniae with three branches, central one long and smooth, two lateral branches marginally pilose and short ( Fig. 3 ).

Legs. All segments with simple and smooth setae and claws absent at the tip of leg I.

Gnathosoma ( Figs 4 & 10 ). Corniculi horn-like, internal malae marginally pilose, apically covered byshort hairs and longer than corniculi. Hypostomal setae h1 placed near anterior margin of hypostoma, (ca. 70 µm) smooth and needle-like, and h2 (ca. 40 µm), h3 (ca. 35 µm) and h4 (ca. 20 µm) marginally serrate. Trochanter with one short and marginally serrate seta, and other seta long, apically divided into two branches and these branches with serrate margins. Epistome marginally serrate and apically divided into four pilose branches ( Fig. 5 ). Chelicera with one large tooth on movable digit and several short teeth on the fixed digit, internal sclerotized node present ( Fig. 6 ).

Male. Length of idiosoma 1330–1410 µm, width 920–980 µm (n = 4). Shape oval, posterior margin rounded. Dorsal idiosoma. Ornamentation and chaetotaxy as for female.

Ventral idiosoma. Ornamentation and chaetotaxy of ventral shield as for female. Sternal shield bearing small oval pits, all of sternal setae smooth and thorn-like. St1, St2, St4 and St5 short (ca. 25–30 µm), St3 long (ca. 50 µm), St1 situated near anterior margin of sternal shield, St2 placed on level of posterior margin of coxae II, St3 on level of posterior margin of coxae III, St4 near anterior margin of genital shield, St4 near posterior margin of genital shield. Genital shield rounded and placed between coxae IV. Gnathosoma and other appendages similar to that of female.

Nymphs and larva are unknown.

Etymology: The name of the new species refers to the shape of idiosoma.

Remarks. HIRSCHMANN (1977) divided the genus Cyllibula into two subgenera and simultaneously sorted the Cyllibula species into four species groups on the basis of the shape of fourth hypostomal setae. Some years later BŁOSZYK and ATHIAS- BINCHE (1986) established a new subgenus (Wagenaaria) within the genus Cyllibula ignoring the previous subgeneric classification of this genus. Following HIRSCHMANN’ s (1977) subgeneric division (we need to ignore BŁOSZYK and ATHIAS- BINCHE’ (1986) concept, because they did not apply their subgeneric system for the whole genus), we placed the new species into Baloghicyllibula (based on the shape of chelicerae and setae h4), however, the shape of idiosoma and peritreme, and the presence of pygidial shield is a unique character combination in this subgenus and in the genus. The new species differs from the single species presented from Malaysia ( Cyllibula shibai HIRAMATSU, 1980) in shape of peritreme (spiral like in known species and hook-shaped in the new species), in the ornamentation of genital shield of female (covered by oval pits in known species and smooth in the new one) and in the presence of pygidial shield (absent in the known species and present in the new one).

Figures

Figs 1–7. Cyllibula ovalis sp.n.: 1 = female, holotype, dorsal view, 2 = ventral view, 3 = tritosternum, 4 = ventral view of gnathosoma, 5 = epistome, 6 = chelicera, 7 = intercoxal region of male

Figs 8–10. Cyllibula ovalis sp. n., scanning micrographs: 8 = dorsal view, 9 = ventral view,10 = ventral view of gnathosoma