A review of the New Zealand Berosus (Coleoptera: Hydrophilidae) with descriptions of three new species
Seidel Matthias, Sýkora Vít, Leschen Richard A. B., Fikáček Martin
Acta Entomologica Musei Nationalis Pragae 61(1): 243-252, 2021
Published online: 3rd July 2021
Abstract: The New Zealand species of the water scavenger beetle genus Berosus Leach,
1817 are reviewed based on freshly collected material and museum specimens.
Four species are recognized: Berosus pallidipennis (Sharp, 1884) widespread in
the North and South Islands, B. muellerorum sp. nov. from the eastern part of
the North Island, and B. halasi sp. nov. and B. maru sp. nov., both endemic to
central part of South Island. The synonymy of B. mergus Broun, 1886 with B.
pallidipennis is confirmed and lectotypes for both taxa are designated. The
larval morphology of B. pallidipennis and B. muellerorum is briefly discussed.
Distributional data of all species are reported and illustrated, indicating a
noticeable lack of Berosus species in the northern part of North Island and in
Stewart Island and the presence of two rare species in the South Island, east of
Southern Alps. An identification key to New Zealand species of the genus is
Key words: Coleoptera, Hydrophilidae, Berosini, adult morphology, larval morphology,
taxonomy, new species, island fauna, endemism, New Zealand