Burmagomphus chiangmaiensis, Makbun, Noppadon, 2017

Makbun, Noppadon, 2017, A new species of the genus Burmagomphus Williamson (Odonata: Gomphidae) from Northern Thailand, Zootaxa 4269 (1), pp. 133-136 : 133-135

Burmagomphus chiangmaiensis sp. nov. ( Figs. 1–10 )

Material examined. Holotype: ♂, Ban Luang, Chom Thong, Chiang Mai province, Thailand, 890–900 m, 14 v 2012, leg. N. Makbun . Paratype: ♂, same locality, 7 v 2010, leg. N. Makbun . The holotype will be deposited in the Thailand Natural History Museum ( THNHM), Pathum Thani , Thailand; the paratype is kept in the author’s private collection.

Holotype male: Head. Face black with yellow pattern ( Figs. 1–2 ). Occiput black with yellow trapezoid band, posterior margin slightly concave with a row of hairs. Vertex with a pair of blunt tubercles behind lateral ocelli. Antennae black. Dorsal surface of frons hairy, yellow with black upper margin, depressed centrally. Frontal surface of frons black with yellow margin connected to yellow band of dorsal surface. Postclypeus black with yellow medial stripe in lower margin and a pair of yellow lateral spots on both sides. Anteclypeus and gena black. Labrum black with large yellow band interrupted in middle. Base of mandible yellow. Labium black.

Thorax. Prothorax black with yellow lateral spots on median lobe. Synthorax black with yellow markings. Synthorax with mesothoracic collar interrupted in middle. Dorsal stripes joined with collar stripes, forming two inverted 7-shaped stripes ( Fig. 3 ). Antehumeral stripe extended throughout length of mesanepisternum but not connected with mesokatepisternum band. Proepimeron black with a pair of yellowish white lateral spots, anterior one smaller than posterior one. Mesepimeron with yellow lateral stripe, expanded anteriorly at its apex, near its anterior margin. Mesepisternum with yellow irregular stripe. Metepimeron largely yellow with black anterior margin ( Fig. 4 ).

Leg black except coxa with yellow spot, inner face of profemur with yellow band. Metafemur with two rows of large spines.

Wings hyaline, basally tinted with yellowish ( Fig. 10 ). Primary antenodals first and fifth. Ax 13 on Fw, 9 (left), 10 (right) on Hw, Px 10 (left), 12 (right) on Fw, 9 (right), 12 (left) on Hw. Anal triangle 3-celled. Triangles not crossed. One crossvein in cubital space. Two crossveins between Arc and R1-R4 junction. Pterostigma brown, braced, covering 3.5 cells below.

Abdomen black with pale markings as follows ( Fig. 1 ): S1 with dorsal and large lateral spots, S2 dorsally with triangular spot and laterally with a large irregular spot covering auricle, base of S3–7 with basal ring. S8 entirely black. S9 with a large yellow spot posteriorly ( Figs. 5–6 ). S10 entirely black.

Anal appendages. Length of cerci same as S10 ( Figs. 5–6 ). In lateral view cerci black with upper margin straight, slightly curved apically, lower margin basally broader with blunt subapical tooth pointing outward. Cerci slightly diverging in dorsal view. Epiproct diverging with obtuse apex bending outward in dorsal view. Lower margin of epiproct broadest at 1/3 of its length with pointed apex when viewed laterally.

Accessory genitalia. Anterior lamina black and small, semicircular in shape. Posterior hamulus basally narrow and strongly broadening apically, with anterior side slightly raised at apical half, posterior side distinctively swollen with hairy margin, apical side slightly curved; antero-apical tooth broad with pointed tip ( Figs. 7–8 ).

Vesica spermalis typical, with distal segment enlarged and apical part modified to a flagellum ( Fig. 9 ).

Measurements (mm.): Hw 30, abdomen (include caudal appendages) 37, total length (with head and appendages) 52.

Female. Unknown

Variation in paratype male. Paratype male same size as holotype. Ax 12 (right), 13 (left) on Fw, 9 on Hw, Px 10 (left), 11 (right) on Fw, 9 (left), 10 (right) on Hw. Occiput with smaller yellow band.

Etymology. The specific epithet refers to Chiang Mai province, Thailand, where the holotype was first discovered.

Differential diagnosis. According to Kosterin et al. (2012), all Burmagomphus species are categorized into four conventional groups. In group 1, dorsal and antehumeral stripes are connected and form more or less bayonet-like stripe. In group 2, dorsal and antehumeral stripes are short and free. In group 3, dorsal and antehumeral stripes are long and run parallel. In group 4, dorsal and antehumeral stripes are fused into a v-shaped stripe. B. chiangmaiensis sp. nov. falls in group 3, of which all other members of the group ( B. apricus Zhang, Kosterin & Cai, 2015 , B. arvalis (Needham, 1930) , B. collaris (Needham, 1930) , B. dentatus Zhang, Kosterin & Cai, 2015 , B. intinctus (Needham, 1930) , B. magnus Zhang, Kosterin & Cai, 2015 , B. sivalikensis Laidlaw, 1922 , and B. sowerbyi (Needham, 1930)) are distributed in China and India ( Kosterin et al. 2012; Zhang et al. 2015). B. chiangmaiensis sp. nov. is most similar to Chinese B. apricus , with which it shares the peculiar shape of its anal appendages, the synthoracic pattern, and abdominal markings. However, the male of B. chiangmaiensis sp. nov. can be distinguished from B. apricus by: (i) posterior hamulus basally narrow with posterior side distinctively swollen (basally broad with posterior side less swollen in B. apricus ); (ii) Occiput black with yellow trapezoid band (entirely black in B. apricus ); (iii) B. chiangmaiensis sp. nov. larger (male abdomen 37, male Hw 30) than B. apricus (male abdomen 35, male Hw 28). Moreover, there are very slight differences in anal appendages: upper margin of cerci straight, slightly curved apically when viewed laterally (curved in B. apricus ) and tip of epiproct bent outward when seen dorsally (almost straight in B. apricus ).

Habitat. B. chiangmaiensis sp. nov. was found perching on a boulder or on sand beside a fast-running stream in open and partly shadowed areas.

Distribution. So far it is only known from the type locality, Chiang Mai province, Northern Thailand.

Figures

FIGURES 1 – 6. Burmagomphus chiangmaiensis sp. nov., holotype: (1) habitus; (2) head in frontal view; (3) synthorax in dorsal view; (4) synthorax in lateral view; (5) anal appendages in lateral view; (6) anal appendages in dorsal view.

FIGURES 7 – 10. Burmagomphus chiangmaiensis sp. nov., holotype: (7) accessory genitalia in lateral view; (8) accessory genitalia in ventral view; (9) vesica spermalis in lateral view; (10) left fore- and hindwing.