Burmagomphus magnus , Zhang, Hao-Miao, Kosterin, Oleg E. & Cai, Qing-Hua, 2015

Zhang, Hao-Miao, Kosterin, Oleg E. & Cai, Qing-Hua, 2015, New species and records of Burmagomphus Williamson, 1907 (Odonata, Gomphidae) from China, Zootaxa 3999 (1), pp. -1--1: -1

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Burmagomphus magnus

sp. nov.

Burmagomphus magnus  sp. nov.

Figures 11–18View FIGURES 11 – 18, 36View FIGURES 34 – 39

Etymology. magnus  is a Latin adjective meaning ‘big’, chosen because the species described is among the largest in its genus.

Material examined. Holotype: ♂, Huayudong (22 ° 40 ’ 20 ’’N, 103 ° 56 ’ 16 ’’E), altitude 150 m, Nanxi Town, Hekou County, Hani-Yi Autonomous Prefecture of Honghe, Yunnan Province, China, 0 5 May 2010, Hao-miao Zhang leg.; Paratypes: 4 ♂, same data as holotype; 1 ♂, 1 ♀, same site and collector, 0 3 May 2014; 1 ♂, same site and collector, 0 4 May 2014; 1 ♂, same site and collector, 0 8 May 2014; 1 ♂, 1 ♀, same site and collector, 11 May 2014.

Holotype male: Head. Eyes green while alive ( Fig. 36View FIGURES 34 – 39). Face black with pale yellow markings ( Fig. 11View FIGURES 11 – 18). Labium largely pale yellow. Mandible bases pale yellow. Labrum with a pair of very large oval pale spots. Anteclypeus entirely black. Postclypeus almost black with a short and fine stripe on lower margin centrally and very small rounded spots on either side. Top of frons with a very broad yellow stripe. Vertex black with paired tubercles behind and centrally of lateral ocelli. Occiput black, with hind margin straight, fringed with long setae.

Thorax. Generally black with pale yellow markings ( Figs 12View FIGURES 11 – 18, 36View FIGURES 34 – 39). Prothorax with two pale spots on each side of middle lobe. Synthorax with mesothoracic collar interrupted at mid point, dorsal stripes not connecting with collar stripes. Antehumeral stripe extends throughout mesepisternum length but isolated from its continuation on mesokatepisternum. Sides of synthorax largely pale yellow with two broad black stripes, one along the interpleural sutre, the other along the metapleural suture, thus forming three broad yellow stripes. Mesokatepisternum and metakatepisternum with large yellow spots. Legs largely black. Coxae with yellow spots in all legs, and fore leg femur with inner yellow stripes.

Wings. Hyaline, venation black. Forewings: 13 (left) and 15 (right) antenodals above Sc and 14 (left) and 13 (right) antenodals below Sc; 12 (left) and 13 (right) postnodals above R 1, 11 (left) and 13 (right) postnodals below R 1. Hindwing: 10 antenodals above Sc, 9 antenodals below Sc; 10 (left) and 11 (right) postnodals above R 1, 14 (left) and 13 (right) below R 1. Triangles not crossed. Median space without crossvein. Anal loop one-celled. Anal triangle 3 -celled. Pterostigma brown, well braced, below covering 3 (left) and 4 (right) cells on forewings, 4 cells on hindwings.

Abdomen. Black with pale marking as follows ( Fig. 36View FIGURES 34 – 39): S 1 with a large spot laterally and a dorsal spot connecting with dorsal spot in basal half of S 2; sides of S 2 with two oval pale spots, proximal one including auricles; S 3–7 with basal spots; S 9 with a very large dorsal spot posteriorly, without a spine; S 10 and anal appendages black. Cerci of about same length as S 10 but longer than epiproct, in dorsal view tapering and almost parallel, but apical 1 / 4 slightly curved outwards ( Fig. 13View FIGURES 11 – 18); when viewed laterally, lower margin with a short rounded swelling at about 2 / 3 of cercus length ( Fig. 14View FIGURES 11 – 18). Epiproct with a deep and very even median concavity, thus forming two divergent branches with convex outer margins, in lateral view their tips slightly curved upwards. Posterior hamulus relatively narrow at base and strongly broadening apically, with its anterior side convex in apical half and posterior and apical sides straight forming an extended, acute but rounded angle; antero-apical spine strong, straight and rather long ( Fig. 15View FIGURES 11 – 18).

Female: Head and thorax color pattern similar to male ( Figs. 16–17View FIGURES 11 – 18), vertex with two long and slightly curved divergent horns behind lateral ocelli ( Fig. 16View FIGURES 11 – 18). Wing bases slightly tinted with amber. Abdomen with a big yellow spot on either side of S 1 and S 2. S 1 with a dorsal spot connecting with dorsal spot in basal 2 / 3 of S 2; S 3–7 with a basal ring; S 9 with a large semicircular dorsal spot with uneven margins posteriorly; S 10 with three small semicircular spots along posterior margins. Vulvar lamina shown in Fig. 18View FIGURES 11 – 18.

Variation in paratypes. Most male paratypes possess smaller yellow spots on S 10, and the yellow paired stripes on labrum are narrower.

Measurements (mm). Holotype male: total length 53.0, abdomen (including anal appendages) 39.0, hind wing 31.5; Paratype: males: total length 50.0–53.0, abdomen (including anal appendages) 37.0–40.0, hind wing 29.5–31.5; females: total length 51.0–52.0, abdomen (including anal appendages) 38.5–39.0, hind wing 33.5–34.0.

Differential diagnosis. B. magnus  is close to B. intinctus  and differs from it by: (i) longer and tapering cerci, extending caudally beyond the epiproct arms (more evenly thick and extending to a level with the epiproct arms in B. intinctus  , figs. 6–7); (ii) the cercus ventral swelling long and rounded (tooth-like in B. intinctus  , fig. 7); (iii) the cerci apices more processed in lateral view and slightly divaricate in dorsal view (with shorter, blunt and straight apices in B. intinctus  , figs. 6–7); (iv) epiproct arms with convex outer margins in dorsal view (nearly straight in B. intinctus  , fig. 6) and with apices not hooked inward in dorsal view and up in apical view as in B. intinctus  (figs. 6– 7). From B. arvalis  , B. magnus  well differentiated by completely black occiput without a light spot. B. magnus  is much larger (male abdomen 37–40 mm; male hindwing 29.5–31.5 mm) than B. arvalis  and B. apricus  but approaches B. intinctus  (male abdomen 36.5 mm, male hindwing 31–32 mm) in size.

Female of B. magnus  is similar to female of B. dentatus  but has the pair of vertex horns set more widely apart from each other, so that their bases are disposed behind the lateral ocelli and set wider than the occiput, with their apices divergent. Female of B. intinctus  well differentiated from both above-mentioned species by a pair of double short horns behind each lateral ocellus, widely separated by a long transverse vertex ridge ( Fig. 9View FIGURES 6 – 10).

Habitat. The habitat for this species was a lowland river. In some section the river was wide and deep, and males of B. magnus  were found at sandy beach. Some other sections of the river were much narrower, with a lot of big boulders and rocks, and a great number of males were found perching on them. The males held their territory and perched for a long time, but they sometimes patrolled a short distance. Males were found during the daytime from 09:00 to 17:00 but absent during noontime, when the females appeared for laying eggs.

Distribution. Currently known only from eastern Yunnan province, China.