Chlorogomphus vani Phan & Karube 2022, sp. nov.
Creators: name: Phan, Quoc Toan
name: Karube, Haruki
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Cordulegastridae
Chlorogomphus
Chlorogomphus vani

description: Chlorogomphus vani sp. nov.
urn:lsid:zoobank.org:act: 9C02830B-F58F-4024-A1E3-C7BE8DCCC11B
Figs 26–38, 43, 45–46, 62
Diagnosis
Within this genus, the new species seems to be closest to Chlorogomphus auratus and C. canhvang based on the similar male appendage morphology and the amber pattern on the female wings. Chlorogomphus vani sp. nov. differs from two above mentioned species by the following characters: In the male anal appendage morphology, (1) in lateral view, the cercus is shorter than the epiproct (Fig. 37), while it is subequal in C. auratus (Fig. 39) and C. canhvang (Fig. 41); (2) in dorsal view, the cercus is simple and bluntly acute apically (Fig. 38), while it is expanded apically in C. auratus (Fig. 40) and C. canhvang (Fig. 42); (3) in lateral view, S10 has no protrusion between the cerci in C. vani sp. nov. (Fig. 37), but this structure is clearly visible and stout in C. auratus (Fig. 39); and (4) the secondary genitalia of C. vani sp. nov. are similar to those in C. auratus (Karube 1995: fig. 8) but its anterior lamina is subequal in length to the posterior hamule (Fig. 32), while in C. canhvang, the anterior lamina is half the length of the posterior hamule (Kompier & Karube 2018: fig. 3c). In the female, (1) the tinted golden area is less extensive and lacks the black wing tips (Fig. 43), while these features are obvious in C. canhvang and C. auratus (Fig. 44); (2) the shape of the female vertex is posterodorsally concave in C. vani sp. nov. and C. canhvang (Fig. 46), but the posterodorsal margin of the vertex of C. auratus is rounded (Kompier & Karube 2018: fig. 3a); (3) in the synthoracic pattern, C. vani sp. nov. has five narrow yellowish stripes (Fig. 27), but C. auratus and C. canhvang only have three stripes (Kompier & Karube 2018: fig. 1b, e); and (4) the yellow marking on the abdomen of C. vani sp. nov. (Fig. 43) is less extensive than in C. auratus or C. canhvang (Kompier & Karube 2018: fig. 1c, f).
Female specimens of Chlorogomphus auripennis Zhang & Cai, 2014 from southern China also have golden wings, but with a different pattern (Zhang & Cai 2014: figs 2–3). The male of this species is easily distinguished from that of C. auratus, C. canhvang or C. vani sp. nov. by its cercus having a stout ventral spine at the basal ⅔, thus being forked in dorsal view (Zhang & Cai 2014: figs 6–7).
The anal appendages of Chlorogomphus shanicus Wilson, 2002 are somewhat similar to those of C. vani sp. nov., but the epiproct is relatively longer than the cerci and deeply incised in dorsal view (Wilson 2002: figs 12–13).
Etymology
‘ Vani ’, a noun in the genitive case, is named after Mr Dang Ngoc Van (born 1987), resident of Bao Loc District of Lam Dong Province, who kindly supplied the authors with the specimens of this new species, as well as other material from southern Vietnam.
Material examined
Holotype VIETNAM – Dak Lak Province • ♂; K’Rong Bong District, Hoa Phong Commune, Chu Yang Sin National Park; 12.4780° N, 108.4617° E; alt. 749 m; 20 Apr. 2021; Dang Ngoc Van leg.; ZCDTU 2021042001-ODO.
Paratypes VIETNAM – Dak Lak Province • 1 ♂, 4 ♀♀; same collection data as for holotype; ZCDTU 2021042002- ODO to 2006-ODO.
Description
Male (Figs 26, 28–29, 32–34, 37–38, 45)
MEASUREMENTS. Hw 44 mm long, abdomen (including appendages) 56 mm long.
HEAD. Labrum black with a semicircular yellowish marking at central dorsal margin. Anteclypeus black with a narrow, transverse, dark yellow stripe bordering upper margin. Postclypeus yellow with two tiny black spots mediolaterally. Antefrons prominent medially and entirely black. Postfrons black, with a narrow, transverse, yellowish cross stripe. Antennae black, but anterior part of first and second segments dark yellowish (Figs 28–29). Vertex black, hemispherical, posterior margin narrowly concave (Fig. 45). Occiput triangular, black, with long setae on posterior margin. Distance between eyes 0.3 mm.
THORAX.Anterior and middle lobes of prothorax black, posterior lobe black with yellow marks medially. Synthorax black with three yellowish stripe markings as follows: dorsal stripe on mesepisternum narrow; lateral stripes on mesepisternum and metepisternum well developed and broader than dorsal ones; mesepimeron entirely black; metinfraepisternum black with large yellow marking. Coxae and trochanter of fore legs largely yellowish, remainder black; middle and hind legs entirely black (Fig. 26). WINGS. Hyaline with black venation (Fig. 26). Ax/Px ratio 21/ 14 in Fw and 19/ 14 in Hw. In all wings, median space with 1 crossvein. In Hw, basal triangle with 3 cells. Triangle 4-celled and 3-celled in Fw and Hw, respectively, with costal side equal to basal side. Cubital space with 7 crossveins in Fw and 8 crossveins in Hw. Anal loop 14-celled. Pt black, 3–3.2 mm long on both wings, covering 3.5 underlying cells.
ABDOMEN. S1 black with two small yellow spots latero-ventrally. S2 black, dorsally with a yellow spot, distal margin yellowish with another larger yellow marking covering half latero-ventrally. S1–2 broad, subsequently narrower toward tip from S3; S3 with a small yellow anteroventral spot; S3–5 with a small yellow ventral spot; S6–7 black, each with a subapical dorsal spot; S8 black with a short yellow lateroventral strip; S9 entirely black; S10 black with a yellowish marking on ventral side (Fig. 26).
SECONDARY GENITALIA.Anterior lamina broad basally, gradually narrowing apically and strongly curved posteriorly. Posterior hamule thin, as long as anterior lamina, slightly curved anteriorly at tip (Fig. 32).
VESICA SPERMALIS. With typical shape in the genus, as in Figs 33–34. Terminal segment with two long projections and dorsal part of terminal segment subequal to ventral plate; second segment broader and with a stout spine.
ANAL APPENDAGES. Black. Cercus as long as S10, with a simple structure. In lateral and dorsal view, cercus broad basally, gradually narrowing apically; tip rounded, slightly curved ventrally in lateral view
(Figs 37–38). Epiproct in lateral view longer than cercus, abruptly curved dorsally at apical fourth and armed apically with two short teeth (Fig. 37) in dorsal view, epiproct broadly concave apically (Fig. 38).
Female (Figs 27, 30–31, 35–36, 43, 46)
MEASUREMENTS. Hw 53 mm long, abdomen (including appendages) 63 mm long.
HEAD. As in holotype male, but anteclypeus of head dark yellowish with brownish marking ventrally; postfrons with a dorsal transverse yellow stripe, curved medially as in holotype male (Figs 30–31); circular vertex larger than in male, its posterior margin concave, V-shaped (Fig. 46). Distance between eyes 1.4 mm.
THORAX AND LEGS. Prothorax and legs as in holotype male. Synthorax black with several yellowish areas as follows: dorsal stripe on mesepisternum narrow; lateral stripe on mesepisternum broader, slightly sinuous; stripes on mesepimeron slender, longer than those on mesepisternum; lateral stripe on metepisternum largest, covering most of segment and overlapping spiracle and part of metinfraepisternum; mesepimeron black with dorsal and ventral margin yellowish, upper stripe narrow anteriorly, broader near wing base, inner alar sclerite yellow (Fig. 27).
WINGS. Hyaline with amber pattern as follows: on Fw, amber pattern interrupted, beginning to extend from about 15 th Ax to wingtip, darker around nodus; on Hw amber pattern runs from base, covering Ax and beginning to extend from about 14 th Ax to just beyond nodus and to distal margin of anal loop (Figs 27, 43). Ax/Px ratio 25/13 and 20/ 18 in Fw and Hw, respectively. In all wings, median space with 2 crossveins. Triangles with 4 cells in all wings. Triangle in Hw with costal side equal to basal side. Cubital space with 9–10 crossveins in all wings. Anal loop 19-celled. Pt black, 4 mm long on all wings, surmounting 3.5 underlying cells.
ABDOMEN. Black, with yellowish markings as follows: half ventral of S1 (Fig. 27); S2 except for anterodorsally black; S3–7 with a small yellow anteroventral spot, each subsequently becoming larger on successive segments; S8–9 with a small anteroventral yellow spot; S10 entirely black (Fig. 27).
CERCI. Black, as long as S10 (Fig. 35). Valvula valvae trapezoid-shaped, as in Fig. 36. Ventral projection of S10 reaches beyond equal cerci (Fig. 35).
Morphological variation in paratypes
MEASUREMENT VARIATION. Male: abdomen (including appendages) 58 mm long. Females: Hw 52–53 mm long, abdomen (including appendages) 60–65 mm long.
WING VENATION. Male: Ax/Px ratio 22/11 and 17/ 15 in Fw and Hw, respectively. Triangle 3-celled in all wings. Cubital space with 6 cells in Hw. Females: Ax/Px ratio 24–26/12–14 and 19–21/ 16–19 in Fw and Hw, respectively. Median space with 2–3 crossveins in all wings. Cubital space with 9–10 crossveins in all wings. Anal loop 16–17-celled.
OTHER CHARACTERS. Male paratype differs from holotype by having yellow marking on S8 eXtending posteriorly to latero-ventral margin. One paratype female darker golden than the others, with the tip of Hw slightly amber.
Distribution
Vietnam (Fig. 62: yellow rectangle): Dak Lak (Chu Yang Sin National Park) Province.
description: Published as part of Phan, Quoc Toan & Karube, Haruki, 2022, Description of two new species of the genus Chlorogomphus Selys, 1854 (Odonata: Chlorogomphidae) and a new record of Chlorogomphus gracilis Wilson & Reels, 2001 from the Central Highlands of Vietnam, pp. 91-110 in European Journal of Taxonomy 794 (1) on pages 99-105, DOI: 10.5852/ejt.2022.794.1657, http://zenodo.org/record/6131027