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The aggregative, synchronously flashing firefly,    Pteroptyx   tener    congregates on a nightly basis on Berembang trees (   Sonneratia   caseolaris   ) growing along the lower reaches of the Selangor River (West Malaysia). Every night, the males and females of this species engage one another in a pre-mating ritual of flash communication. Little is known of the dietary requirements of the adults of    P.   tener    apart from suggestions that these beetles feed on the nectar and sap of mangrove trees. The drastic reduction in their numbers in recent years has sparked an urgency to understand their dietary needs. Here, we report on a series of probing experiments where we sequenced and analysed DNA fragments obtained from the gut contents of adult    P.   tener    specimens. We detected coding and non-coding chloroplast DNA (cpDNA) gene sequences in the gut DNA extracts of    P.   tener   . One DNA sequence was in reasonably good condition to allow us to match it to the cpDNA sequence of a Malvacean, that is,    Heritiera   littoralis   , a common inhabitant of estuarine habitats. We also detected the DNA sequences of plants (cultivated and natural) that may have come from hamlets or isolated freshwater swamps located further inland. The findings reported here provide early indication that    P.   tener    may be able to travel further inland to search for their hosts. Future research should focus on visually confirming if    P.   tener    feeds on    H.   littoralis    and obtaining a more complete reference DNA database of plants in the firefly habitat.

biorisk

Elucidating food plants of the aggregative, synchronously flashing Southeast Asian firefly,    Pteroptyx   tener    Olivier (  Coleoptera  ,   Lampyridae  )