Abstract
A new genus of Baetidae is described from Southeast Asia, Procerobaetis gen. nov. It has a wide distribution reaching from Indonesia (Sumatra) to the Philippines. Two new species are described from Indonesia, P. leptobranchius gen. et sp. nov. and P. petersorum gen. et sp. nov., and one new species from the Philippines, P. freitagi gen. et sp. nov. Procerobaetis gen. nov. is characterized by having seven pairs of elongate, apically pointed gills. At least gills I and II are very slender with strongly extended points, which is unique in Baetidae. Similar gills were described from Leptophlebiidae. Procerobaetis gen. nov. is further characterized by having long, slender legs with extended, slender and slightly bent claws. The antennae posess remarkable spines at the outer, lateral margin, which are maximally developed on segments IX–XI of the flagellum. No spines are present on the posterior margins of abdominal tergites I–VI. COI sequences were obtained from all three of the new species. The genetic distances (Kimura 2-parameter) between these species are between 13% and 20%. Very limited genetic distances of 0% to 1% were found between specimens of the same species. The occurrence of two different species in the same area of Sumatra is discussed.
Highlights
The family Baetidae has the highest species diversity among mayflies, comprising 1070 species in 110 genera (Sartori & Brittain 2015; Jacobus et al 2019), which is about 30% of all mayfly species worldwide (Jacobus et al 2019)
We describe a new genus from Southeast Asia, based on material collected by Morgan Gueuning (University of Neuchatel, Switzerland; Gueuning et al 2017) in Indonesia and on the collection stored in the Biodiversity Laboratory headed by Hendrik Freitag (Ateneo de Manila University, Philippines) in the Philippines
Procerobaetis is a combination of Procero – in reference to the elongate, slender habitus of the larvae – and baetis to highlight its superficial similarities with the genus Baetis Leach, 1815 s. lat
Summary
The family Baetidae has the highest species diversity among mayflies, comprising 1070 species in 110 genera (Sartori & Brittain 2015; Jacobus et al 2019), which is about 30% of all mayfly species worldwide (Jacobus et al 2019) They have a cosmopolitan distribution, except in Antarctica and New Zealand. Intensive sampling in an area of only 85 km on the island Borneo (Indonesia, East Kalimantan) revealed the occurence of 12 different genera of Baetidae, some of them undescribed (Sartori et al 2003). This could be attributed to a relatively low mayfly research output in the Oriental realm over a long period. The last two new genera of Baetidae from the Oriental region were described in 2012 from Borneo (Gattolliat 2012)
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