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| Paegniodes sapanensis Boonsoong, Sartori & Auychinda, in Boonsoong, Auychinda, Sartori & Khanyom, 2021. |
Abstract
A new species of Heptageniidae, Paegniodes sapanensis sp. 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.
Keywords: COI, diversity, mayfly, Southeast Asia
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| Paegniodes sapanensis sp. nov., habitus (live) A immature larva B male larva C female larva D closer view of female subimago E male subimago F female subimago. |
Order Ephemeroptera
Family Heptageniidae
Genus Paegniodes Eaton, 1881
Paegniodes sapanensis Boonsoong, Sartori & Auychinda, sp. nov.
Diagnostic characters of imaginal stage: 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.
Etymology: The specific epithet is named for the Sapan waterfall (Bo Kluea district; tourist attraction of Nan province, Thailand), where the holotype is known.
Distribution: Nan province.
Biological aspects: The specimens were collected from tropical mountain streams (Fig. 11A) which are slightly disturbed by tourist activities. The larvae of the new species were found in flowing areas and the littoral zone of the streams, underneath a mostly cobble substrate (Fig. 11B, C).
Boonsatien Boonsoong, Chonlakran Auychinda, Michel Sartori and Nuttakun Khanyom. 2021. First Record of Paegniodes Eaton, 1881 (Ephemeroptera, Heptageniidae) from Thailand with Description of A New Species. ZooKeys. 1036: 153-170. DOI: 10.3897/zookeys.1036.64880
