Paederinae

Fleming, 1821

Tomcat

Tribe Guides

Paederinae is a of rove beetles (Staphylinidae) containing three tribes: Lathrobiini, Paederini, and Pinophilini. The subfamily is notable for containing the Paederus and related genera that produce , a potent vesicant toxin in their haemolymph that causes Paederus dermatitis in humans. The subfamily exhibits diverse ecological adaptations including myrmecophily, troglobitic cave-dwelling, and intertidal lifestyles. Over 36 genera and 436 occur in North America alone, with global distribution across multiple biogeographic regions.

Scopaeus minutus by (c) carnifex, some rights reserved (CC BY), uploaded by carnifex. Used under a CC-BY license.

Lithocharis nigriceps by (c) Олег Кудров, some rights reserved (CC BY), uploaded by Олег Кудров. Used under a CC-BY license.

Tetartopeus niger by no rights reserved, uploaded by Nick Bédard. Used under a CC0 license.

Pronunciation

How to pronounce Paederinae: /paɪˈdɛrɪniː/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Members of Paederinae can be distinguished from other Staphylinidae by tribal-level characters. The subtribe Paederina (within Paederini) includes associated with production. Specific identification requires examination of aedeagal structures; keys to are available for many regional faunas including New Zealand, China, and Turkey. The genus Hyperomma is restricted to Australia and New Zealand. The genus Domene includes the first known troglobitic Paederinae from China.

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Habitat

are highly variable across the . occur in damp places, under logs, in caves and nests, in leaf litter, and on foliage. The Sclerochiton inhabits forest litter at 150-2400 m elevation. Domene lizeyui is troglobitic, inhabiting dolomite caves. Medon species include intertidal forms on East Asian coasts. Ecitonides species are myrmecophilous, associated with ants. Medon piceus occupies forest areas in Moldova, while Astenus discopunctatus occurs in oak-hornbeam forest litter.

Distribution

Global distribution with concentration in temperate and tropical regions. North America: 36 , 436 . Asia: high diversity in China, India, Thailand (five Sclerochiton species each), Nepal (three species). New Zealand: 25 Hyperomma species. Turkey: documented fauna including Achenium and Medon. South Africa: genus Neopimus. Eastern Asia: only three cavernicolous species recorded. Disjunct distributions occur in some genera: Sclerochiton has six Afrotropical species and fifteen Oriental/East Palaearctic species.

Seasonality

of Sclerochiton have been observed throughout the year. Specific seasonal patterns for most are not documented.

Behavior

Ecitonides are myrmecophilous. Some Domene species are troglobitic, showing cave-adapted . Intertidal Medon species occupy coastal .

Human Relevance

Certain in the subtribe Paederina (Paederini tribe) contain , a vesicant toxin more potent than cobra venom that causes Paederus dermatitis upon skin contact. This represents a significant medical concern in regions where these beetles are common. The 'Tomcat' refers to this .

Similar Taxa

StaphylininaeAnother large of Staphylinidae; distinguished by different tribal composition and lack of -producing
PseudopsinaeSmall rove beetle ; Paederinae distinguished by three-tribe structure and specific aedeagal characters

More Details

Tribal composition

As of 2024, three tribes are accepted: Lathrobiini, Paederini, and Pinophilini. Previous classifications listed only Paederini and Pinophilini.

Toxin biology

is not produced by the beetles themselves but by bacterial . Only certain subtribes within Paederini (notably Paederina) contain pederin-producing .