Psydrini

LeConte, 1853

Genus Guides

Psydrini is a tribe of ground beetles within the Psydrinae, established by LeConte in 1853. Members are small to medium-sized carabids with a primarily Pacific distribution, particularly diverse in Australia and New Zealand. The tribe includes such as Psydrus and Mecyclothorax, with the latter showing exceptional radiation on oceanic islands.

Psydrini by (c) Yves Bousquet, some rights reserved (CC BY). Used under a CC-BY license.

Psydrus piceus by (c) Trevor Van Loon, some rights reserved (CC BY), uploaded by Trevor Van Loon. Used under a CC-BY license.

Nomius pygmaeus - inat 405943600 by {{{name}}}. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Psydrini: /psaɪˈdraɪni/

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Images

Distribution

Primarily distributed across the Pacific region, with notable diversity in Australia, New Zealand, and Pacific islands including Hawaii. Some representatives occur in western North America.

More Details

Taxonomic note

Psydrini was historically treated as a subtribe or synonym of other groups, but molecular and morphological studies support its recognition as a distinct tribe within Psydrinae. The Hawaiian Mecyclothorax radiation represents one of the most extensive island adaptive radiations known in beetles.

Phylogenetic significance

The tribe has been important in studies of and speciation, particularly the Mecyclothorax lineage in Hawaii, which has diversified into hundreds of .