Description of the larva of Cybister lewisianus Sharp, 1873 (Coleoptera, Dytiscidae, Cybistrinae)

By

Watanabe, Kohei
Hayashi, Masakazu

Type

Article

Date of Publication

2024

Original Publication

ZooKeys

Volume

1197

Pages

137--152

Subjects

chaetotaxy , diving beetle , larval morphology , larval stage , red list , water beetle

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.1197.119508

 

Abstract

We describe for the first time, the larvae of Cybister (Cybister) lewisianus Sharp, 1873, an endangered species of diving beetle in Japan, emphasizing the chaetotaxy of the cephalic capsule, head appendages, legs, last abdominal segment, and urogomphi. Cybister lewisianus larvae are characterized by a longer third article of antenna 3 than the sum of the first and second articles; rounded apex of parietal setae 1–3; labium seta 8 absent; elongated trochanter seta 4, not multi-branched; rounded apex of abdominal setae 1, 12, and 13 (instar I); narrow lateral projections of the frontoclypeus; pronotum without two dark-brown longitudinal stripes dorsally (instar III); and the base of the thick row of small setae on the inner edge of the mandible angulate and projecting medially (all instars).