A FIRST RECORD OF Fissimentum Cranston & Nolte (DIPTERA: CHIRONOMIDAE) IN PENINSULAR MALAYSIA

Abstract

A new record of Fissimentum Cranston & Nolte (Diptera:
Chironomidae), Fissimentum sp by its immature stage has been
recorded from upstream of Tampik River Pahang, Malaysia for
the first time and been described at larval stage. This genus is
distinguished from others by having a mentum with a distinct
cleft mid, with 6 segmented antenna, in combination with
louterborn organs at the apex of segment 2 or 3. Mandible
remarks with large seta subdentalis and lacking of pecten
mandibularis and seta interna. Descriptions, diagnosis and line
drawings of larva material are provided. A brief note on the
ecology of the genus is also given.