Contribution to the study of Epeorus Eaton, 1881 (Ephemeroptera: Heptageniidae) from India Author Vasanth, M. 0000-0003-4446-4889 Zoological Survey of India, Southern Regional Centre, Santhome High Road, Chennai- 600028, India. & University of Madras, Chepauk, Chennai- 600005. & vasan 071994 @ gmail. com; https: // orcid. org / 0000 - 0003 - 4446 - 4889 vasan071994@gmail.com Author Selvakumar, C. 0000-0002-4296-5682 Department of Zoology, The Madura College (Autonomous), Madurai- 625011, Tamil Nadu. & selvaaa 06 @ gmail. com; https: // orcid. org / 0000 - 0002 - 4296 - 5682 selvaaa06@gmail.com Author Subramanian, K. A. Zoological Survey of India, Southern Regional Centre, Santhome High Road, Chennai- 600028, India. Author Sivaramakrishnan, K. G. 0000-0002-6332-0349 Flat No 3, Door No 7, Gokulam Apartment, Gokulam Colony, West Mambalam, Chennai- 600 033, India. & kgskrishnan @ gmail. com; https: // orcid. org / 0000 - 0002 - 6332 - 0349 kgskrishnan@gmail.com Author Sinha, Bikramjit 0000-0002-9904-4964 Zoological Survey of India, Arunachal Pradesh Regional Centre, Senki Valley, Itanagar- 791113, Arunachal Pradesh, India. & sinhabj @ gmail. com; https: // orcid. org / 0000 - 0002 - 9904 - 4964 sinhabj@gmail.com text Zootaxa 2021 2021-06-25 4991 3 499 522 journal article 10.11646/zootaxa.4991.3.4 1175-5326 5042522 842EA450-A680-4D5D-9723-C1D7CCE13E5D Epeorus ( Epeorus ) gilliesi Braasch, 1981 ( Figs 68–84 ) Material examined: 1 larva , INDIA , Karnataka , Sharavathi river , below Jog falls , 26.xi.1928 [ Reg. No. 7348/H13, ZSI, Kolkata ] ; 1 larva , Goa , Tambdi Surla , 17.ix.2017 ; coll. K. A. Subramanian [ZSI/ SRC-I /E-334] . Description: Mature larva: Body length 13.5 mm ; length of caudal filaments 12 mm . Body generally brown ( Fig. 68 ). FIGURES 50–57. Larva of Epeorus ( Epeorus ) unispinosus 50 . Dorsal view; 51 . Abdomen ventral view; 52 . Closer view of abdomen; 53 . Closer view of abdominal terga V; 54 . Labrum; 55 . Hypopharynx; 56 . Mandible; 57 . Maxilla. FIGURES 58–67. Larva of Epeorus ( Epeorus ) unispinosus 58. Labium; 59 . Foreleg; 60 . Dorsal surface of forefemur; 61 . Midleg; 62 . Hindleg; 63 . Claw; 64 . Gill I; 65 . Gill III; 66. Gill V; 67. Gill VII. FIGURES 68–74. Larva of Epeorus ( Epeorus ) gilliesi 68 . Dorsal view; 69 . Abdomen ventral view; 70 . Posterior margins of terga; 71 . Labrum; 72 . Hypopharynx; 73 . Left mandible; 74 . Right mandible. Head: Length 1.7 mm , width 3.6 mm ; brown ( Fig. 68 ); subquadrangular; anterior and lateral margins convex, with rows of dense hair-like setae directed medially-dorsally-backward and pressed to head; posterior margin slightly concave. Compound eyes grayish black. Antennal scape, pedicels and flagellum brown. Labrum wide, dark brown, anterior margin with 14–15 denticles; long hair-like setae laterally ( Fig. 71 ). Hypopharynx as in Fig. 72 . Mandible with scattered setae along molar area; incisors well developed; outer incisor longer than inner incisor ( Figs 73–74 ). Maxilla as in Fig. 75 . Labium broad, glossae with V-shaped separation, subtriangular; paraglossae slightly expanded laterally; apical segment of palp acutely pointed, dorsal surface with dense row of comb setae ( Fig. 76 ). Thorax: Pronotum pale brown; mesonotum darker brown with paramedian pair of darker spots anteriorly and pair of lateroparapsidal sutures curved inside posteriorly ( Fig. 68 ). Legs ( Figs 78–80 ): Femora brown; hypodermal spot on dorsal surface; dense row of long setae on outer margin; scattered stout setae on dorsal surface ( Fig. 77 ); margin of tibia with dense hair-like setae. Claw with 5 denticles ( Fig. 81 ). Abdomen: Abdominal terga brown, a row of spines on posterior margin of segment I–X, terga III–VIII with a pair of brown spots ( Figs 68, 70 ); posterior margin of terga with rather short spines; segments II–VII with long posterolateral extensions; sterna pale with pair of brown color marking on each segments ( Fig. 69 ). Gill I elongated, somewhat extended beneath of abdomen, middle pairs large widely rounded ( Fig. 68 ); Gills II–VII without arched anal ribs ( Figs 82–84 ). Cerci with row of hair-like setae dorsally. FIGURES 75–84. Larva of Epeorus ( Epeorus ) gilliesi 75 . Maxilla; 76 . Labium; 77 . Dorsal surface of femur; 78. Foreleg; 79 . Midleg; 80 . Hindleg; 81 . Claw; 82 . Gill I; 83 . Gill III; 84 . Gill VII. Diagnosis: Epeorus gilliesi can be distinguished from closely related species E. petersi by the following combination of characters: in larva (i) abdominal terga III–VIII with pair of brown spot ( Figs 68–70 ); (ii) a row of spine on posterior margin of segment I–X ( Figs 68–70 ); (iii) posterior edge of the gill 1 elongated ( Fig. 82 ); and (iv) anterior margin of labrum with 14–15 denticles ( Fig. 71 ). Distribution: India ( Karnataka , Goa and Maharashtra ). Remarks: The larva of this species was described from Khandala ( Maharashtra ), India by Braasch (1981); we provide a supplementary larval description based on our material from south India . Adult stages are unknown.