Review and integrative taxonomy of the genus Prosopistoma Latreille, 1833 (Ephemeroptera, Prosopistomatidae) in Thailand, with description of a new species.

Boonsatien Boonsoong,Michel Sartori

doi:10.3897/zookeys.825.32443

Abstract

Three species of the genus Prosopistoma Latreille, 1833 (Prosopistomatidae) are currently reported from Thailand. A new species, Prosopistomacarinatumsp. n., is described here based on specimens from western and southern Thailand. The new species can be easily distinguished from the other members of Prosopistoma by the following combination of characteristics: (i) the presence of two ridged longitudinal lines on each side of its carapace, (ii) antenna 7-segmented, (iii) a strongly convex carapace and (iv) nine pectinate setae on the ventral margin of the fore tibiae. A comparison between the key characteristics of P.carinatumsp. n. and the known Thai species is provided. Results of analysis of the mitochondrial cytochrome oxidase I (COI) gene (658 bp) of three species, as well as the distribution of the Thai species, are also discussed.

Highlights

Prosopistomatidae (Ephemeroptera) is a monogeneric family, represented by the genus Prosopistoma, which was originally established by Latreille (1833)
The molecular analysis revealed that Prosopistoma carinatum sp. n. is clearly separated from the other species
The larvae of P. annamense and P. sinense were placed in the same clade, and they share the characteristics of 5-segmented antenna and a smooth carapace

Summary

Introduction

Prosopistomatidae (Ephemeroptera) is a monogeneric family, represented by the genus Prosopistoma, which was originally established by Latreille (1833). Of the 27 species described to date, 16 species have been described from the Oriental region (Lieftinck 1932, Peters 1967, Soldán and Braasch 1984, Tong and Dudgeon 2000, Sartori and Gattolliat 2003, Zhou and Zheng 2004, Barber-James et al 2008, Barber-James 2009, Shi and Tong 2013; Balachandran et al 2016, Roopa et al 2017). An updated key to the known species of this realm was provided by Shi and Tong (2013). In Thailand, only the larvae of Prosopistoma annamense Soldán & Braasch, 1984, P. sinense Tong & Dudgeon, 2000, and P. wouterae Lieftinck, 1932 are known (Parnrong et al 2002, Tungpairojwong and Boonsoong 2011). A distribution map of the genus in Thailand and mitochondrial COI sequence data are provided

Materials and methods

Discussion