[Entomology • 2024] Baetiella baei, B. lannaensis & B. bibranchia • Taxonomic Notes on the Genus Baetiella Uéno, 1931 (Ephemeroptera: Baetidae), with Description of Three New Species from Thailand

Baetiella (Baetiella) lannaensis

Phlai-ngam, Boonsoong, Gattolliat & Tungpairojwong, 2024

DOI: 10.3897/zookeys.1200.116787

 

Abstract

Based on material recently collected in northern Thailand, the present study provides an updated of the genus Baetiella, including Gratia. It comprises six species in Thailand, three of them being new species: Baetiella (Gratia) narumonae, Baetiella (Gratia) sororculaenadinae, Baetiella (Baetiella) bispinosa, Baetiella (Baetiella) baei sp. nov., Baetiella (Baetiella) lannaensis sp. nov. and Baetiella (Baetiella) bibranchia sp. nov. Baetiella (Baetiella) baei sp. nov. can be distinguished from other species by the reduction of the posteromedian protuberances on abdominal tergites I–III, the asymmetrical coniform terminal segment of labial palp, the distal margin of abdominal sternites VII–X each with a row of long, spatulate setae, the dorsal margin of femur with two long, robust setae distally. Baetiella (Baetiella) lannaensis sp. nov. is diagnosed by the posteromedian protuberances present on tergites I–VIII, dorsal margin of femur with a regular row of long, rounded, ciliated setae and body surface covered with numerous, dense, rounded scale-like setae. Baetiella (Baetiella) bibranchia sp. nov. can be separated from other species by coxal gills present at the base of forelegs and midlegs. The molecular study based on the mitochondrial gene COI and a larval key to species of Thai Baetiella are also provided.

Key words: COI gene, diversity, mayflies, revision, Southeast Asia

Baetiella (Baetiella) lannaensis sp. nov., female larva A early larval stage B mature larva.

Sampling sites and the coexistence microhabitats of Baetiella (Baetiella) baei sp. nov. and Baetiella (Baetiella) lannaensis sp. nov.
A Siribhum waterfall (Chiang Mai province) B, C microhabitats of Siribhum waterfall and Mo Pang waterfall (Mae Hong Son Province) respectively. White arrows indicate coexisting microhabitats of B. (Baetiella) baei sp. nov. and Baetiella (Baetiella) lannaensis sp. nov.

 

Sirikamon Phlai-ngam, Boonsatien Boonsoong, Jean-Luc Gattolliat and Nisarat Tungpairojwong. 2024. Taxonomic Notes on the Genus Baetiella Uéno, 1931 (Ephemeroptera, Baetidae), with Description of Three New Species from Thailand. ZooKeys. 1200: 303-352. DOI: 10.3897/zookeys.1200.116787