Ecdyonurus (Rhithrogeniella)

Kluge, Nikita, Sivaruban, T., Srinivasan, Pandiarajan, Barathy, S. & Isack, Rajasekaran, 2023, Redescription of the subgenus Rhithrogeniella Ulmer 1939 (Ephemeroptera, Heptageniidae, genus Ecdyonurus) based on reared specimens from India and Thailand, Zootaxa 5319 (4), pp. 501-523 : 522

Ecdyonurus (Rhithrogeniella) sp. 2

( Figs 103–109 , 111–116 )

Material examined. INDIA, state Kerala, Erumeli, river Koratty , 20.I.2016, coll. N. Kluge & L. Sheyko: 4 S-I♂, 2 S♂, 1 S ♀ .

Characteristics

Larva. Unknown.

Winged stages. Similar to E. (Rh.) ornatus . Male and female subimago differ from E. (Rh.) ornatus by contrasting dark brown ventral ark of prealar bridge ( Figs 107–109 ) [in contrast to narrowly colored with lighter brown in E. (Rh.) ornatus — Fig. 110 ]. Male imago differs from E. (Rh.) ornatus and other species by penis lobes closely brought together ( Figs 111, 113–114 ). Hypodermal coloration of abdominal terga of male and female imago and subimago is more composite than in E. (Rh.) ornatus ( Figs 104–106 ).

Egg. Chorion is densely and irregularly covered with roundish papilla and fewer knob-terminated coiled thread ( KTC); micropiles wide and roundish ( Figs 115–116 ). In contrast to E. (Rh.) ornatus , net-like relief or its traces are completely absent.

Dimension. Fore wing length 4–5 mm.

Figures

FIGURES 103–110. 103–109, Ecdyonurus (Rhithrogeniella) sp. 2: 103, male imago, 104, abdomen of male imago; 105, male subimago; 106, female subimago; 107, thorax of male subimago, ventral view; 108, male subimaginal exuviae; 109, enlarged part of its ventral arc of prealar bridge; 110, the same of E. (Rh.) ornatus.

FIGURES 111–116. Ecdyonurus (Rhithrogeniella) sp. 2: 111, genitalia of male imago; 112, penis of male subimago; 113–114, penes of male imagines; 115–116, eggs.