Allopachria yiae, Bian, Dongju, Guo, Cheng & Ji, Lanzhu, 2013

Bian, Dongju, Guo, Cheng & Ji, Lanzhu, 2013, Allopachria yiae sp. n. from Chongqing, China (Coleoptera: Dytiscidae: Hydroporinae), Zootaxa 3681 (1), pp. 85-88 : 85-87

Allopachria yiae sp. n.

( Figs. 1–8 )

Type locality: China, Chongqing Municipality, Wushan County, 31°14’N 109°47’E.

Type material. Holotype, male: labeled “ CHINA: Chongqing, Wushan County, Dacang Town, Yingpan, 31°14’N 109°47’E, 1034 m, 2012.5.4, Leg. Yi & Guo”, “ HOLOTYPE, Allopachria yiae sp. n. ”[red printed label] ( CASS). Paratypes: 6 males and 22 females, with same data as holotype. All specimens are provided with a red paratype label ( CASS, CHF, NMPC).

Description. Body regularly oval, distinctly convex ( Fig. 1 ). Length of body: holotype: 2.65 mm, paratypes: 2.65– 2.85 mm, width of body: 1.8 mm; paratypes: 1.8–1.9 mm.

Head dark ferruginous, paler along clypeal margin and behind the eyes. Clypeal margin truncate; head irregularly and sparsely punctured, more distinct on vertex; head completely micro-reticulate. Antennae testaceous, moderately long and slender.

Pronotum black, paler along lateral margin; lateral margin distinctly bordered; punctures irregular in size and distribution, distinctly coarser on basal half; without micro-reticulation.

Elytron black, each with two rufo-testaceous spots; subbasal spot neither reaching suture nor lateral margin of elytra; oblique posteromedial spot near lateral margin; pre-apical spot lacking. Punctures coarse, almost regular in size and distribution, longitudinal rows of punctures distinct; surface highly smooth and shining; without microreticulation.

Ventral side including epipleura testaceous to dark ferruginous ( Fig. 3 ). Punctures strong on metaventrite and metacoxal plates, smaller and sparser on epipleuron and abdomen; abdominal ventrites with fine microreticulation. Legs rufo-testaceous.

Male: median lobe of aedeagus trilobate, as in Figs. 5 and 6 ; lateral lobe (paramere) as in Fig. 7 . Antennomeres five to nine slightly enlarged; first protarsomere significantly enlarged and its basal half with distinct indention on inner margin ( Fig. 4 ); mesotarsomeres only slightly enlarged.

Female: colour and surface sculpture as in males; antennae, pro- and mesotarsomeres not modified. Variability: colour of head varying from ferruginous to dark ferruginous, of pronotum and ground of elytra from dark ferruginous to black. Elytra of some paratypes more attenuated apically; posteromedial oblique spots lacking in some specimens with attenuated elytra as well as in others without attenuated elytra (specimen with attenuated elytra and lacking spots shown in Fig. 2 ).

Comparison with other species: The following comparison relates only to males, as most female Allopachria cannot be determined reliably. Allopachria yiae sp. n. belongs to a group of eight species with a trilobate median lobe of the aedeagus. It can be distinguished as follows:

- From A. flavomaculata (Kamiya, 1938) , A. jaechi Wewalka, 2000 , A. komareki Wewalka, 2010 , A. manfredi Wewalka, 2010 , and A. wangi Wewalka & Nilsson, 1994 by the lack of the longitudinal impression above the lateral margin of the elytra;

- From A. bimaculata (Satô, 1972) by the larger size and the completely microreticulated head;

- From A. wuzhifengensis Bian & Ji, 2010 by the smaller size of the posteromedial oblique spot on the elytra (if present), and the shape of the median lobe of which the side branches end considerably far before the tip of the central one, while they reach more or less as far as the central one in A. wuzhifengensis .

Etymology. This species is dedicated to Miss Xuemei Yi who collected some of the type specimens. The specific epithet is a noun in the genitive case.

Distribution. China; so far known only from the type locality in Chongqing Municipality. Habitat. River pool, ca. 10 m wide, with gravels and sand, without vegetation (see Fig. 8 ).

Figures

FIGURE 8. Habitat of Allopachria yiae sp. n. [photography by Cheng Guo].

FIGURES 1 – 4. Allopachria yiae sp. n. 1, 3 – 4) holotype; 2) paratype with attenuated elytra and lacking posteromedial oblique spots. 1 – 2) habitus in dorsal view; 3) habitus in ventral view; 4) right protibia and protarsus.

FIGURES 5 – 7. Allopachria yiae sp. n. (holotype) 5) median lobe of aedeagus in ventral view; 6) median lobe in lateral view; 7) lateral lobe of aedeagus (paramere).