Choroterpes (Monophyllus) nandini Selvakumar & Sivaramakrishnan

Selvakumar, C., Janarthanan, S. & Sivaramakrishnan, K. G., 2015, A new species of the Choroterpes Eaton, 1881 subgenus Monophyllus Kluge, 2012 and a new record of the subgenus Choroterpes, s. s. (Ephemeroptera: Leptophlebiidae) from southern Western Ghats, India, Zootaxa 3941 (2), pp. 284-288 : 285

Choroterpes (Monophyllus) nandini Selvakumar & Sivaramakrishnan n. sp.

Figs. 1–14 .

Material examined. Holotype: Male larva, INDIA, Karnataka, Sringeri, Nanthinihole, 13°23’23.52” N, 75°10’47.02” E, 640 m, 03.v.2013, Colls. C. Selvakumar and K. G. Sivaramakrishnan [ZSI]. Paratypes: 1 female larva same data as holotype; 2 female larvae, INDIA, Karnataka, Sringeri, Srimane falls, 13°23’14.83” N, 75°10’46.43” E, 716 m, 03.v.2013, Colls. C. Selvakumar and K. G. Sivaramakrishnan [UM].

Description. Larva. Body length 4 mm, cerci 3 mm, median filament 4 mm ( Fig. 1 ). Labrum ( Fig. 2 ) not wide, median emargination moderately deep, without denticles; both distal and proximal transverse setal rows regular. Lingua of hypopharynx with well developed lateral processes, anterior margin shallowly cleft ( Fig. 3 ). Mandibles ( Figs. 4, 5 ) with outer margin moderately convex. Medio-apical projection of maxilla moderately expresed ( Fig. 6 ). Labium ( Fig. 7 ) with segment 2 of palpi 3/4 to a little longer than segment 1; segment 3 of palpi over 1/2 length to as long as segment 2, triangular with a rows of seate apically; paraglossae ventral to glossae. Legs yellowish ( Figs. 8–10 ); each femur with a dark brown spot at middle and a dark brown band near apex; fore femur also with a brown spot near base, widest proximally; middle and hind femur widest middle. All femora with irregularly situated stout setae of various lengths. Ventral side of hind femur with irregularly situated curved pectinate setae. Stout setae on inner side of foretibiae dense and arranged in 3 nearly regular rows, pointed and pectinate. Inner side of middle tibia with 2 or 1 stout setae. Inner side of hind tibia with a sparse row of stout setae; outer side of hind tibia with stout setae of variable length, as on outer side of femur. Outer sides of all tibiae with irregularly situated thin hairs, whose length exceed tibia width. Claws ( Fig. 11 ) apically hooked, denticles on claws progressively larger apically. Hind wings present. Abdomen without stout setae; posterolateral margins of abdominal terga with pointed denticles, whose size increases from tergum 1 to tergum 10; sterna without denticles. Each segment of abdominal tergum brown with lighter blanks adjacent to anterior margin. Gills ( Figs. 12–14 ) on segments 1–7, unilamellate without tracheation; gills 2–7 terminated in 3 slender, subequal processes. Terminal filament longer than cerci with a whorl of setae every alternate segments; setae longher than length of correspondingsegment.

Winged stages. Unknown.

Etymology. This species named after the type locality, the Nandini hole.

Diagnosis. Choroterpes (Monophyllus) nandini n. sp. can be distinguished from C. (Monophyllus) monophyllus by the following combination of characters: (i) median emargination of labrum moderately deep, without denticles; (ii) gills 2–7 without tracheation and (iii) abdominal segment 6 and 7 without colour pattern.

Discussion. Kluge, while revising the mayfly system based on the principles of cladogendesis ( Kluge & Novikova 2011; Kluge 2012b) with usage of the dual nomenclature system ( Kluge 2010), established the subgenus Monophyllus based on the larvae collected from Hainan Island, Republic of China. Larvae of Choroterpes (Monophyllus) monophyllus ( Kluge 2012a) , is characterized by the following autapomorphy viz. gills 2–7 unilamellate, each lamella with 3 apical processes subequal, long and slender as in Euthraulus . The occurrence of C. (Monophyllus) nandini n. sp. extends the distribution of this subgenus from China to South India.

Figures

FIGURES 1 – 14. Larva of Choroterpes (Monophyllus) nandini n. sp. 1, Dorsal view of male; 2, Labrum; 3, Hypopharynx; 4, Left mandible; 5, Right mandible; 6, Maxillae; 7, Labium; 8, Foreleg; 9, Midleg; 10, Hindleg; 11, Claw; 12, Gill 1; 13, Gill 4; 14, Gill 7.