Microdytes huangyongensis, Bian, Dongju, Zhang, Yue & Ji, Lanzhu, 2015

Bian, Dongju, Zhang, Yue & Ji, Lanzhu, 2015, Microdytes huangyongensis sp. n. and new records of Allopachria Zimmermann, 1924 from Zhejiang Province, China (Coleoptera: Dytiscidae), Zootaxa 4040 (4), pp. 469-471 : 469-470

Microdytes huangyongensis sp. n.

Type locality: China: Zhejiang Province, Lishui City, Longquan County, Huangyong Village, 28°5'N 118°54'E.

Type material. Holotype, male: labelled “ China: Zhejiang, Lishui City, Longquan County, Huangyong Village, 28°5'N 118°54'E, 460 m, 2014. 0 8. 18, leg. Bian & Tong”, “ Holotype, Allopachria huangyongensis sp. n. ” [red printed label]; paratypes: 3 males, 7 females, same data as holotype except for a red printed paratype label.

Diagnosis. The species is similar to M. bistroemi Wewalka, 1997 in body size, habitus and entirely microreticulated head, but can be distinguished by elytral markings and male genitalia. The species is also similar to M. pederzanii Wewalka, 2011 in habitus, markings on elytra and entirely microreticulated head, but can be distinguished by its smaller size and male genitalia.

Description. Holotype: habitus ( Fig. 1 ), body regularly oval, distinctly convex; body length 1.6 mm, width 1.1 mm.

Head: yellowish-brown; anterior margin of clypeus somewhat truncate; finely and very sparsely punctate, a row of coarser punctures along eyes; surface entirely and distinctly microreticulated. Antennae flavo-testaceous.

Pronotum: brown to dark brown, lateral margins finely bordered; double-sized punctures densely and irregularly distributed; larger and denser punctures along posterior margin; with some longitudinal wrinkles along posterior margin; surface without microreticulation.

Elytra: yellowish-brown to dark brown, with flavo-testaceous spots: a transverse basal spot, a post-median transverse lateral spot, an elongated oval median spot near suture, and a transverse spot near apex; punctures fairly fine and irregularly distributed; surface highly polished and shinning, without microreticulation.

Ventral surface: ventral side of head yellowish-brown, rest of ventral side brown to black; punctures on metaventrite and metacoxae fine and very sparse, irregularly distributed; ventrites smooth and shining, almost without punctures; surface without microreticulation. Front- and middle-legs yellowish brown, hind-legs testaceous.

Aedeagus: median lobe as in Figs 3– 4 , parameres as in Figs 5–6 .

Variability. In some specimens, the elongated oval median spot near suture is missing. Males: body length 1.6–1.65 mm, width 1.1 mm. Females: body length 1.5–1.55 mm, width 1.05–1.1 mm. Females a little smaller than males, without secondary sexual characters.

Etymology. The species is named after the Chinese Village of Huangyong. The specific epithet is an adjective in the nominative singular.

Distribution. So far known only from the type locality: China: Zhejiang Province. Habitat. Temporary stream in Bamboo forest, ca. 0.5 m wide, slowly flowing, with gravels, sand and decaying leaves ( Fig. 2 ).

Figures

FIGURES 1 – 2. Microdytes huangyongensis sp. n. 1) Habitus and colour pattern of the holotype. 2) Habitat, photographed by D. Bian (China: Zhejiang, Lishui, Longquan).

FIGURES 3 – 6. Microdytes huangyongensis sp. n. 3) median lobe, in ventral view; 4) median lobe, in lateral view; 5) left paramere, external surface; 6) right paramere, inner surface.