# A new species of Languidipes Hubbard (Ephemeroptera, Polymitarcyidae) from Borneo

## TL;DR

A new mayfly species, Languidipes janae, is discovered in Borneo, expanding the known range of the genus.

## Contribution

The discovery and description of a new Languidipes species from Borneo, with unique morphological features.

## Key findings

- Languidipes janae is characterized by unique features like ommation on mesonotum and a divided penis.
- This is the first record of the genus Languidipes in Borneo.
- Cladistic analysis confirms the new species' taxonomic status within the subfamily Asthenopodinae.

## Abstract

The genus Languidipes is currently represented by three species distributed in southeastern Asia, India, and Sri Lanka. Languidipes corporaali is the most widely distributed species, and both, male and female imagos, as well as nymphs, are known. In contrast, the other species, L. taprobanes and L. lithophagus, are only known from nymphs. Here, we describe a new species, Languidipes janae sp nov, based on male imagos collected from Borneo, Indonesia. This new species is characterized by the presence of ommation on mesonotum, and penis almost completely divided, with sub-quadrate base and a small outer projection basal to the long and slender distal arms. This constitutes the first record of the genus for Borneo. A cladistic analysis of the subfamily Asthenopodinae supports its taxonomic status.