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Type: Article
Published: 2022-04-12
Page range: 351-378
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A new species of Acentrella Bengtsson, 1912 (Ephemeroptera: Baetidae) from Thailand

Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. Applied Taxonomic Research Center, Khon Kaen University, Khon Kaen 40002, Thailand.
Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. Center of Excellence on Biodiversity Tab Nilaniti Building 2nd Fl., Department of Biology, Faculty of Science, Chulalongkorn University Phayathai Road, Pathumwan Bangkok 10330, Thailand.
Division of Science, Indiana University Purdue University Columbus, 4601 Central Ave., Columbus, Indiana, 47203, USA.
Ephemeroptera Acentrellini Mayflies South-East Asia Indomalayan region Oriental region

Abstract

Following a series of biodiversity surveys conducted in Thailand, Acentrella fimbriata sp. nov. is described and illustrated based on the nymph, male subimago and egg stages. Our new species can be distinguished from other Acentrella species by the following combination of characteristics in the nymphal stage: a head capsule relatively densely covered with long, fine, simple setae, increasing in number on the genae and clypeus; the scape and pedicel densely covered with long, fine, simple setae along the inner margins; femoral margins with dense, irregular rows of long, simple setae; terga lateral margins with numerous fine, simple setae, increasing in number posteriorly; terga posterior margins with poorly-developed denticles, and with scattered ovoid and truncated translucent scales, increasing in number laterally; and gills on segments II–VII with abundant long, fine, simple setae apically. This species prefers cobble substrates in shallow and slow-moving water, where it is found covered with sediment. Extensive new reports of Acentrella (Liebebiella) vera (Müller-Liebenau, 1982) are given that show it to be a species widespread in Thailand and that provide basis for comparisons to our new species. Global systematics of Acentrella Bengtsson, 1912 are discussed.

 

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