Cheleocloeon vaigaiensis, Sivaruban & Srinivasan & Barathy & Isack & Kluge, 2022

Sivaruban, T., Srinivasan, Pandiarajan, Barathy, S., Isack, Rajasekaran & Kluge, Nikita, 2022, First report of Cheleocloeon Wuillot & Gillies 1993 (Ephemeroptera: Baetidae) from the Oriental Region, Zootaxa 5209 (3), pp. 339-352 : 341

Cheleocloeon vaigaiensis sp. n.

( Figs 1–59 )

Material. Holotype: L-S-I ♂, INDIA, Tamil Nadu state, Madurai, river Vaigai , 30.VII.2022, coll. P. Srinivasan, R. Isack ( AMC; new species register number 258) . Paratypes: the same locality, and collectors, 28–31.VII.2021: 1 LS-I ♂, 1 L-S ♂, 1 L-S-I ♀, 4 larvae ( AMC; new species register number 259). The same locality, 10.II.2016, coll. N. Kluge, 1 male larva ( ZIN) .

Etymology. The new species is named after the river Vaigai, in which it was collected.

Figures

FIGURES 1–5. Cheleocloeon vaigaiensis sp. n., larvae. 1, female larva; 2–3, exuviae of two specimens; 4–5, exuviae of caudalii (holotype).

FIGURES 6–15. Cheleocloeon vaigaiensis sp. n., larvae. 6–7, labrum; 8–9, apices of left and right mandibles; 10, mola of right mandible; 11–12, maxilla; 13–15, labium (6–7, 11–12, holotype). Abbreviations: ds1, ds2, ds3, dentisetae.

FIGURES 16–21. Cheleocloeon vaigaiensis sp. n., fore leg of larval exuviae (holotype). 16, anterior view; 17, outer margin of femur; 18, patella-tibial suture; 19, tarsus; 20, claw; 21, enlarged portion of claw (thin arrows show larger denticles).

FIGURES 22–30. Cheleocloeon vaigaiensis sp. n., exuviae of larval abdomen. 22, anterior portion of sternum VI; 23, posterior portion of sternum VI; 24, posterior portion of tergum VI; 25, apex of male abdomen, ventral view; 26, terga I–III; 27, terga VIII–X; 28, paraprocts; 29, middle portion of cercus; 30, distal portion of cercus (22, 24–30, holotype).

FIGURES 31–39. Cheleocloeon vaigaiensis sp. n. (holotype). 31–38, tergalii I–VII; 39, distal margin of tergalius I.

FIGURES 40–44. Cheleocloeon vaigaiensis sp. n. 40, female imago; 41–42, male imago; 43, male subimago; 44, fore leg of male imago (41–42, 44, holotype).

FIGURES 45–53. Cheleocloeon vaigaiensis sp. n. 45, hind protopteron of male larva; 46, vestige of hind protopteron of female larva; 47, pterostigma of fore wing of male imago; 48. hind wing of male imago; 49, vestige of hind wing of female imago; 50. fore tarsus of female imago; 51, hind leg of male imago; 52, subimaginal exuviae of mesonotum; 53, subimaginal exuviae of middle leg of male subimago (47–48, 51–53, holotype).

FIGURES 54–57. Cheleocloeon vaigaiensis sp. n., genitalia of male imago (holotype). 54, intact genitalia, ventral view; 55, dorsal view (left gonovectis detached and turned to left, right gonovectis in natural position; 56, detached gonovectis; 57, gonostylus.

FIGURES 58–59. Cheleocloeon vaigaiensis sp. n., egg.