Phymatodiscus kuni, Kontschán & Starý, 2011

Kontschán, Jenő & Starý, Josef, 2011, Uropodina species from Vietnam (Acari: Mesostigmata), Zootaxa 2807, pp. 1-28 : 15

Phymatodiscus kuni sp. nov.

( Figs 37–41 )

Material examined. Holotype. Female ( HNHM), Vietnam, Bac Kan Province, Ba Be National Park, Lake Ba Be, tropical forest, 0 2 October 2008, Z. Korsós and A. Kun coll. Paratype. One male ( ISB). Locality and date same as holotype.

Description. Female. Length of idiosoma 730 µm, width 580 µm (n=1). Shape oval.

Dorsal idiosoma ( Fig. 37 ). Marginal and dorsal shields not fused. Dorsal shield bearing long (ca 65–70 µm) and short (ca 25–35 µm) smooth setae, and one pair of deep, eye-like transverse furrows at level of coxae IV, bordered with long, setiform setae. Dorsal shield covered by large, oval pits medially and small, alveolar pits laterally, otherwise smooth. Marginal setae short (ca 17–20 µm), smooth and needle-like. Marginal shield without sculptural pattern, its caudal section with crenulate anterior margin.

Ventral idiosoma ( Fig. 38 ). Ornamentation on sternal shield absent. Sternal setae short (ca 10–12 µm), smooth and needle-like. St1 situated near anterior margin of sternal shield, St2 and St3 at level of posterior margin of coxae II, St4 at level of anterior margin of coxae IV, St5 near posterior corners of genital shield. Ventral setae smooth, needle-like, two pairs of very short setae (ca 12–13 µm) situated near the metapodal lines, and two pairs of short setae (ca 12–13 µm) posterolateral to anal opening. One pair of moderate length setae (ca 24–25 µm) anterior to anal opening, and three pairs of similar length situated lateral to anal opening. Caudal margin of ventral idisoma with four pairs of long setae (ca 60–65 µm). Margins lateral to pedofossae with two types of setae, some serrate and long (65–67 µm), others smooth and short (ca 12–14 µm) ( Fig. 39 ). Ventral shield covered by irregular pits between metapodal lines and by web-like structure near pedofossae of coxae IV. Stigmata situated between coxae II and III. Peritremes hook-shaped. Genital shield scutiform, covered by alveolar pits basally and without process on its apical margin. Base of tritosternum narrow, tritosternal laciniae subdivided into three serrate branches ( Fig. 40 ).

Gnathosoma ( Fig. 40 ). Corniculi horn-like, internal malae longer than corniculi, their margins pilose. Hypostomal setae h1 ca 40 µm long, marginally serrate, h2 short (ca 10 µm), smooth, h3 long (ca 30 µm), marginally serrate, h4 short (ca 13 µm), apically serrate. Epistome and chelicerae not clearly visible.

Male. Length of idiosoma 680 µm, width 540 µm (n = 1). Shape of idiosoma, ornamentation, and chaetotaxy of dorsum as in female. Sternal setae smooth, short (10–12 µm) and needle-like, St1-St4 situated anterior to genital shield, St5 near posterior corners of genital shield. Surface of sternal shields mooth, genital shield oval and situated between coxae IV ( Fig. 31 ). Ventral setae and ornamentation similar to those of female.

Etymology. This species is named in honor of my collegue and friend, Dr. András Kun lepidopterologist, who collected this species.

Remarks. Ten species of Phymatodiscus have been described from New Guinea, Japan and Indonesia ( WiŠniewski & Hirschmann, 1993). Three (Ph. oculatus Hirschmann, Ph. aokii Hiramatsu and Ph. haradai Hiramatsu) of the described species have a pair of deep, eye-like, transverse furrows, bordered with long, setiform setae at level of coxae IV. The distinguishing characters between the mentioned three and the new species are summarized in Table 4 .

Figures

FIGURES 37 – 41. Phymatodiscus kuni sp. nov., female. 37, dorsal view; 38, ventral view; 39, lateroventral setae; 42, ventral view of gnathosoma, tritosternum and coxae I; 43, male, intercoxal region. (scale bar: 100 μm).

FIGURES 26 – 31. Uroobovella multisetosa sp. nov., female. 26, dorsal view; 27, ventral view; 28, tritosternum; 29, ventral view of gnathosoma and coxae I; 30, chelicerae; 31, male, intercoxal region. (scale bar: 100 μm).