New record of the genus Baetiella Ueno, 1931 (Ephemeroptera: Baetidae) from India with description of a new species and new records for five species

摘要

A new species of the genus Baetiella is described based on larvae collected from Arunachal Pradesh, India. Baetiella subansiri Vasanth, Selvakumar & Subramanian n. sp. can be distinguished by the following combination of characters: (i) gills (or gill sockets) on segments I-VI; gills I-V elongate, without tracheation, with numerous scattered pores on the surface and smooth fine simple setae along margin; gill VI reduced; (ii) posterior margin of metanotum and abdominal terga I-II each with a single posteromedian protuberance, terga III-IX each with a pair of much longer protuberances; and (iii) claw with two rows of denticles, outer row with 6-7 acute denticles increasing in length apically, inner row with 6-7 short and blunt denticles medially, subequal in length. New records of Baetiella armata Braasch, 1983, B. ausobskyi Braasch, 1983, B. imanishii Braasch, 1983, B. marginata Braasch, 1983 and B. spathae Shi & Tong, 2015 from Arunachal Pradesh, India are presented based on the collection of larvae. The four species of Baetiella described by Braasch (1983) are redescribed based on freshly collected material. The Known distribution of genus Baetiella from Arunachal Pradesh, India is also provided.