Myrmica liui, Chen, Zhilin, Zhou, Shanyi & Huang, Jianhua, 2016

Chen, Zhilin, Zhou, Shanyi & Huang, Jianhua, 2016, Seven species new to science and one newly recorded species of the ant genus Myrmica Latreille, 1804 from China, with proposal of a new synonym (Hymenoptera, Formicidae), ZooKeys 551, pp. 85-128 : 96-99

Taxon classification Animalia ORDO FAMILIA

Myrmica liui sp. n. Figures 14-16

Type material.

Holotype worker. Helanshan , Inner Mongolia Autonomous Region, China, 38°52'29"N, 105°53'42"E, 2597m. 8.vii.2010, leg. Zhilin Chen, No. G100237 . Paratypes. 5 workers, data as per holotype.

Measurements and descriptions.

Holotype worker. HL 1.13, HW 0.93, FW 0.40, FLW 0.50, SL 0.88, PW 0.65, ML 1.38, PL 0.38, PH 0.38, ESL 0.18, CI 1.21, FI 0.43, FLI 1.25, SI1 0.78, SI2 0.94, ESLI 0.19. Paratype workers (n = 6). HL 1.10−1.15, HW 0.91−0.94, FW 0.35−0.41, FLW 0.45−0.50, SL 0.85−0.90, PW 0.60−0.71, ML 1.33−1.40, PL 0.32−0.42, PH 0.33−0.41, ESL 0.13−0.17, CI 1.18−1.22, FI 0.31−0.34, FLI 1.28−1.33, SI1 0.77−0.82, SI2 0.90−0.96, ESLI 0.18−0.21.

Holotype worker. Head longer than broad, with weakly convex sides and posterior margin, and broadly rounded posterior corners; anterior clypeal margin broadly rounded, shallowly notched medially. Frontal carinae very feebly curved, merging with the rugae that extend to the margin of the head. Frons wide, frontal lobes much extended. Antennal scape long (SI2 0.94), slightly shorter than head width, gradually though distinctly curved at the base, with ridge on the inner margin.

Mesosoma in profile view weakly convex; promesonotal suture in dorsal view visible, metanotal groove very weak or absent. Propodeal lobes rounded. Propodeal spines short, blunt, directly backward and downward. Petiole with anterior surface concave, meeting the dorsal one to form a blunt angle, dorsum of node somewhat convex and steeply sloping backward, without dorsal plate. Postpetiole shorter than high, with convex dorsum. Spurs on middle and hind tibiae well-developed and pectinate.

Head with coarse longitudinal rugae on the whole dorsum, number of rugae between frontal carinae level with the eyes <20. Posterior part and lateral sides of the head coarsely reticulated. Clypeus with coarse longitudinal rugae. Frontal triangle with a few longitudinal rugae, space between rugae shiny.

Dorsum and sides of mesosoma with less sinuous longitudinal rugae, space between rugae smooth and shiny. Petiole and postpetiole with short rugae, and densely punctate.

Head with abundant, long, suberect hairs at lateral margins; dorsum of mesosoma with longer hairs, petiole with 6−8 long and some shorter hairs. Antennal scape and tibiae with subdecumbent hairs. Head and gaster colored dark brown, mesosoma reddish-brown, appendages lighter.

Paratype workers. As holotype.

Queens and males. Unknown.

Habitat.

This species nests in the soil in alpine meadow, at elevation 2573m.

Etymology.

The specific epithet is the Chinese name Gongquan Liu, who was a famous Chinese calligrapher in the Tang Dynasty.

Differential diagnosis.

This species belongs to the lobicornis species group, which is one of the three most diverse species group of the Old World, containing 22 species ( Radchenko and Elmes 2010). Radchenko and Elmes (2010) divided this group into five species complex, based on worker characters. This species shares features of kasczenkoi -complex of this group by mesosoma with less coarse sinuous longitudinal rugosity, propodeal spines shorter (ESLI ≤ 0.35), petiole of various shape, but never with well developed flattened dorsal plate. The kasczenkoi -complex includes 5 species: Myrmica angulinodis , Myrmica commarginata , Myrmica displicentia , Myrmica kamtschatica and Myrmica kasczenkoi . Myrmica liui sp. n. is similar to Myrmica angulinodis , but the latter propodeal spines that curved inward when viwed from above. Myrmica liui sp. n. is very similar to Myrmica commarginata , but differs from the latter by dorsum of petiole somewhat convex and steeply sloping backward, without dorsal plate; on the other hand, the latter possesses unique morphological feature: mesonotum and propodeum are strongly conwtricted laterally, so that dorsal surface of them is narrow and form a sharp fidges, merging with the outer bases of propodeal spines. Myrmica liui sp. n. also semblables to Myrmica displicentia , but differs from the latter by dorsum of petiole without dorsal plate. This species is also similar to Myrmica kasczenkoi Ruzsky, but differs from the latter by antennal scape with ridge at the base of the inner margin; propodeal spines thin, short, only 1/2 times longer than the distance between them, somewhat narrow at the base, backward and curved downward; petiole without dorsal plate. This species resembles to Myrmica kamtschatica , but well differs from the latter by frontal carinae merges with the rugae that extend to the margin of the head, petiole without dorsal plate.

This species also is similar to Myrmica sulcinodis Nylander of the sulcinodis -complex, but differs from the latter by sides of petiolar node with punctures and short rugae less coarse than those on the mesosoma. Metanotal groove very weak or absent. Anterior surface of petiole concave, meeting the dorsal one through a rounded angle, dorsum of node somewhat convex and steeply sloping backward.