Abstract
A new species of Heptageniidae, Paegniodes sapanensissp. nov., is described based on larvae, subimagos, eggs, and COI data. The mayfly genus Paegniodes Eaton, 1881 is reported for the first time from Thailand. The larva of the new species can be distinguished from other known Paegniodes species by i) lamellae of gill I ca 1/4 of fibrilliform portion and ii) mandibles and basal segment of maxillary palp without dense setae on margin. The subimago characters useful to distinguish this new species from previously known species are i) the median stripes on abdominal terga and ii) shape of the female subgenital and subanal plates. The genetic distance between the new species and P. cupulatus (Eaton, 1871) was approximately 11%. The morphological characters of the new species are discussed and compared to other known species.
Highlights
The poorly known mayfly genus Paegniodes, established by Eaton (1881), currently comprises two valid species: P. cupulatus (Eaton, 1871) from China (Ma et al 2018; adults, larva, and egg) and P. dao Nguyen & Bae, 2004 from Vietnam (Nguyen and Bae 2004; larva only)
The complete mitochondrial genome of P. cupulatus was provided by Zhou et al (2014)
The diagnostic characters to distinguish our new species from P. cupulatus are: i) the median stripes on abdominal terga and ii) lateral margins of genital plates slightly concave near apex
Summary
The poorly known mayfly genus Paegniodes, established by Eaton (1881), currently comprises two valid species: P. cupulatus (Eaton, 1871) from China (Ma et al 2018; adults, larva, and egg) and P. dao Nguyen & Bae, 2004 from Vietnam (Nguyen and Bae 2004; larva only). Based on the unique characters of the imaginal and larval stages, Ma et al (2018) clearly confirmed the generic status of Paegniodes, following Webb and McCafferty (2008). The complete mitochondrial genome of P. cupulatus was provided by Zhou et al (2014). Some genera of Thai heptageniid mayflies remain unclear and require taxonomic revision. We describe a new species of Paegniodes based on specimens from Nan province. The mitochondrial COI sequence data and a distribution map of the genus are provided
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