A widespread new genus of Baetidae (Baetidae, Ephemeroptera) from Southeast Asia

By

Kaltenbach, Thomas
Kluge, Nikita Julievich
Gattolliat, Jean-Luc

Type

Article

Date of Publication

2022

Original Publication

ZooKeys

Volume

1135

Pages

1--59

Subjects

Accessory gills , COI , Indonesia , integrated taxonomy , Malaysia , Philippines

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.1135.93800

 

Abstract

A reinvestigation of type and other material ofBaetis javanicusUlmer, 1913 andBaetis sabahensisMüller-Liebenau, 1984, together with new material from Southeast Asia revealed a new genus,Branchiobaetisgen. nov.The above species are formally assigned to the new genusBranchiobaetisgen. nov.It is characterized by the presence of accessory gills ventrally near fore coxa and at the base of maxillae, a peculiar folding of the gonostyli developing under the cuticle of last instar male larvae, together with a unique combination of other larval characters. Besides the two formerly described species, five new species are identified using a combination of morphology and molecular characters (COI, Kimura 2-parameter distances), four species from Sumatra and one from the Philippines. They are described and illustrated at the larval stage. Additionally, a complementary description of larva and adult stages of the generic type speciesB. javanicuscomb. nov.as well as the first description of the eggs are provided. Furthermore, new reports ofB. javanicuscomb. nov.andB. sabahensiscomb. nov.are indicated. The distribution ofBranchiobaetisgen. nov.includes the Indonesian Sunda Islands, Borneo, and the Philippines. A key to the larval stage of all species is provided.