Epimetopus

Lacordaire, 1854

hooded shore beetles

Species Guides

Epimetopus thermarum

Epimetopus is a New World of semiaquatic beetles commonly known as hooded shore beetles, comprising 56 ranging from Argentina to Arizona and Arkansas. The genus was revised in 2012, with 36 new species described and new collection records provided for 15 previously described species. is concentrated in South America (37 species) and areas north of South America (17 species), with only two species known from both regions. The genus is absent from the Amazon basin and is divided into seven species groups based on morphological characters.

Pronunciation

How to pronounce Epimetopus: /ˌɛpɪˈmiːtəpəs/

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Identification

Members of Epimetopus are distinguished from other hydrophiloid beetles by the presence of a pronotal hood—a distinctive structure covering part of the . The underside of this pronotal hood, described and illustrated for the first time in the 2012 revision, provides important diagnostic characters for -level identification. Male genitalia are used to distinguish closely related species within the seven defined species groups.

Habitat

Semiaquatic environments; associated with shore . The is notably absent from the Amazon basin despite its broad Neotropical and Nearctic distribution.

Distribution

Argentina to Arizona and Arkansas. Thirty-seven are restricted to South America, seventeen species occur only north of South America, and two species are known from both regions. No records from the Amazon basin.

Human Relevance

Epimetopus mendeli was discovered during entomological collecting expeditions in Peru and named in honor of Gregor Mendel. The of one was collected by Charles Darwin and remained unidentified in museum collections for over 150 years before recognition as a new species belonging to a new .

Similar Taxa

Other Hydrophiloidea familiesEpimetopus is distinguished by the unique pronotal hood structure not found in other hydrophiloid beetles; Epimetopidae was established based on this and other autapomorphic characters.

More Details

Species diversity

The contains 56 divided into seven species groups, five of which were newly delineated in the 2012 revision.

Taxonomic history

Originally described by Lacordaire in 1854. One synonymy was proposed in the 2012 revision: E. leechi Rocha was placed as a junior synonym of E. balfourbrownei Rocha.