Review of the Cincticostella insolta (Allen, 1971) complex (Ephemeroptera: Ephemerellidae), with description of three new species from northern India and Nepal

Abstract

The Cincticostella insolta complex (Ephemeroptera: Ephemerellidae) is reviewed based on new and historic material, as well as new field observations. Three new species are described viz., C. richardi Martynov & Palatov, sp. nov. and C. ranga Selvakumar & Subramanian, sp. nov. from India, and C. sivaramakrishnani Martynov & Palatov, sp. nov. from Nepal. A correction of the original description and some additional distinguishing features are given for C. braaschi Jacobus & McCafferty, 2008. Cincticostella insolta (Allen, 1971), C. braaschi and C. bifurcata Xie, Jia, Chen, Jacobus & Zhou, 2009 are recorded from the Indian subregion for the first time. Summaries of known distribution data and habitat preferences, as well as larval diagnoses, are presented for all seven species of the complex.

Overview of Indian and Nepali representatives of the Cincticostella nigra (Uéno, 1928) complex (Ephemeroptera, Ephemerellidae), with discussion about Cincticostella Allen, 1971 species complexes

“…Nepal: 2 larvae (one on slide 634), Gandaki Zone, Kaski District, stream at the Tolka-Lambruk Road, 28. (Allen, 1975); C. insolta (Allen, 1971); C. ranga Selvakumar & Subramanian, 2019; C. richardi Palatov, 2019 andC. wangi Selvakumar, Martynov &Subramanian, sp.…”

“…This article is a further contribution to a series of papers (Martynov et al 2019(Martynov et al , 2021 about spiny crawler mayflies (Ephemeroptera: Ephemerellidae) of the Indian subregion, in this case devoted to Indian and Nepali representatives of the genus Cincticostella Allen, 1971 (Ephemerellinae: Ephemerellini) that were not previously covered as part of the C. insolta (Allen, 1971) complex.…”

A new species of Cincticostella (Ephemeroptera, Ephemerellidae) from China

“…We may expect that imaginal characters will confirm the separation and validity of these closely related species. The type-locality of C. tornata is located 1200 km north to those of C. femorata and 2350 km north to those of C. boja (1700 km north to the closest report from Thailand) (Martynov et al 2019). These long distances may explain the differences observed between taxa and may be the results of vicariant speciation.…”

“…They consequently considered C. boja as a junior synonym of C. femorata (Jacobus et al 2005). Comparisons of original illustrations and descriptions of the two species as well as more recent illustrations of specimens attributed to C. femorata from China (Xie et al 2009) and Thailand (Martynov et al 2019) challenged this synonymy. The species is now considered as occurring in Vietnam, Thailand and China (Martynov et al 2019;Xie et al 2009).…”

“…Map distribution of C. femorata and C. tornata. C. femorata represented by green circle(Gose 1969), blue circle (Tshernova 1972), gray circle(Jacobus 2005) and yellow square(Martynov et al 2019); C. tornata represented by red triangular. Localities of C. femorata in China are not reported on the map as the species was mentioned from China byXie et al 2009 but without further information.…”