Epeorus (Epeorus) gilliesi Braasch 1981
Creators: name: Vasanth, M.
name: Selvakumar, C.
name: Subramanian, K. A.
name: Sivaramakrishnan, K. G.
name: Sinha, Bikramjit
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Heptageniidae
Epeorus
Epeorus gilliesi

description: 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).   
 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.   
 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.
description: Published as part of Vasanth, M., Selvakumar, C., Subramanian, K. A., Sivaramakrishnan, K. G. & Sinha, Bikramjit, 2021, Contribution to the study of Epeorus Eaton, 1881 (Ephemeroptera: Heptageniidae) from India, pp. 499-522 in Zootaxa 4991 (3) on pages 508-513, DOI: 10.11646/zootaxa.4991.3.4, http://zenodo.org/record/5042522