Platygomphus benritarum, Joshi, 2022
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publication ID |
https://doi.org/10.48156/1388.2022.1917172 |
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DOI |
https://doi.org/10.5281/zenodo.15576304 |
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persistent identifier |
https://treatment.plazi.org/id/03CEA72A-FF97-0D17-ED62-775F106F953B |
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treatment provided by |
Felipe |
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scientific name |
Platygomphus benritarum |
| status |
sp. nov. |
Platygomphus benritarum View in CoL sp. nov. Joshi & Mital
Figs 5–6 View Figure 5 View Figure 6
Holotype
m# ( IBC-BO402 ): Rudra Padh Temple on the bank of Brahmaputra River (N 26.6158, E 92.7711, alt.: 64 m), Tezpur, Assam, India, 6.v.2020, Shantanu Joshi and Anuja Mital leg. GoogleMaps
Etymology
Named in honor of Monisha “Ben” Behal (founder, North East Network), and Rita Banerji (founder, Green Hub) for their pioneering work across two decades. Both women have been empowering and training the youth of northeast India to become change-makers, working towards creating ecological security, sustainable livelihoods, and social change. The species epithet is the feminine genitive plural created from combining the two names Ben and Rita.
Holotype male
Head ( Fig. 5a View Figure 5 ). Eyes turquoise blue. Labium yellow, face dark brown, covered with hairs on the sides, faint yellow paired spots on labrum, anteclypeus paler brown, large paired blue spots covering almost the entire postfrons, postfrons with brown setae. Blue and brown bands on the first and second segments of antenna, filament black. Labrum 2.3 times as wide as long. Ocellar region sky-blue, junction of frons and vertex white, vertex black, occiput pale bluish yellow, occipital ridge black with a yellow spot.
Thorax ( Figs 5c–e View Figure 5 ). Prothorax yellow with median lobes. Pterothorax black, marked with greenish yellow as follows: mesothoracic collar, dorsally with oval spots, stripe on mesepisternum, laterally broadly yellow with black stripes across sutures.
Legs black, profemora internally marked yellow, covered with black spines; coxae yellow. Venter of thorax and base of legs slightly pruinose. Wings ( Fig. 5b View Figure 5 ). Base of wings and membranes yellow. Pterostigma dark brown, pterostigmal brace present. Antenodals (1 st and 5 th primary) 12 (right), 13 (lef) on FW, 9 (right), 10 (lef, one incomplete nervure at end) on HW. Postnodals 8 on all wings. Base of HW slightly excavated. Anal triangle three-celled, triangular and slightly curved along the margin. Anal loop absent. One cubito-anal vein each in all wings. Discoidal field of FW starting with two rows of cells, three rows from the level of node; expanded towards the margin. Single rows of cells between CuA and MP, and between RP 2 and IRP 2, two rows near margin.
Abdomen ( Figs 5c–e View Figure 5 ). Narrow up to anterior half of S7, S8 expanded, S9–10 tapering. Black marked with yellow. S1 to base of S3 laterally greenish yellow, S3–7 with basal annules, broken on S3 and extensive on S7. Auricles triangular, pointed. S2–3 with a mediodorsal triangular marking pointing posteriorly, small faint dorsal spots on S4–5. Markings gradually turning yellowish brown, especially from S7. S9 with paired dorsal markings along lateral margins and a small marking on the posterior border; S10 dark brown.
Vesica spermalis ( Figs 6a, b, d View Figure 6 ). Genital lobe expanded, brown. Anterior hamuli short, simple, rounded, and covered with setae on apices. Posterior hamuli longer, shaped like a wrench; apical anterior margin notched, apices anteriorly curved, ending in a spine. V2 simple, rounded at edges, ventrally marked white. V3 curved at base, with a ventral beak-like prepuce, broadening on the apices, V4 with protuberances ventrally, saddle-shaped extensions; apical filaments short, apices anteriorly curved.
Caudal appendages ( Figs 6c, e, f View Figure 6 ). Black, epiproct brown at base and laterally. Cerci 1.2 times longer than epiproct. Cerci expanded, trilobate; lateral margin forming a sharp spine at base, outer edge serrated, apices ending in two spines. Epiproct slightly divaricate, ending in an upwardly curved spine.
Measurements. Abdomen + caudal appendages = 32.9, FW = 32.6, HW = 31.
Diagnosis
This species is placed in the genus Platygomphus due to the shape of the male genitalia (ending with divergent apical filaments, Fig. 6d View Figure 6 ), and anal triangle three-celled and curved along the margin. From P. dolabratus and P. feae , this species can be distinguished by: (a) the shape of its caudal appendages (bilobate, similar in P. feae but medial ridge prominent with the two lobes less furcated; Figs 5e–f View Figure 5 ), (b) markings on face (labrum, clypeus, antefrons brown with pale bluish frons in P. benritarum vs. face extensively yellow; Fig. 5a View Figure 5 ), and (c) shape of apical flagellum of V4 (short and thick, vs. long in P. dolabratus and P. feae ; Fig. 5d View Figure 5 ). Platygomphus benritarum is also smaller (32.9 mm) than both of its congeners (40 mm in P. dolabratus and 35–37 mm in P. feae ). Nodal index of P. benritarum is lower than that of P. dolabratus , comparable to P. feae . This species also resembles Asahinagomphus insolitus (especially with regard to the shape of its caudal appendages), but differs from it by the lateral thoracic markings, three-celled and curved anal triangle (twocelled and not curved in A. insolitus ), hamuli (anterior hamuli small and simple) and vesica spermalis (apices of V4 simple without filaments in Asahinagomphus ).
Habits and habitat
A single male was found resting on a large Ficus tree situated about 5–6 meters from the banks of Brahmaputra River near the Rudra Padh Temple at around 17.00 h. The habitat along the banks is dominated by grasses, sparse trees, paddy fields, and marshlands along with some forest patches and tree plantations ( Fig. 7 View Figure 7 ). Platygomphus spp. (especially P. dolabratus ) are known to prefer lowland rivers with sandy banks and sparse vegetation, which also seems to apply to this species.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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