Ilybius angustior
(Gyllenhal, 1808)
Ilybius angustior is a predaceous diving beetle in the Dytiscidae. It has a Holarctic distribution, occurring in North America and the Palearctic region. The was historically confused with I. picipes, from which it is now recognized as distinct based on genital and surface sheen.
Pronunciation
How to pronounce Ilybius angustior: /ˈɪlɪbiˌʊs ænˈɡʌstiˌɔr/
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Identification
Distinguished from the similar I. picipes by the aeneous (bronzy or coppery) upper surface of most specimens, whereas I. picipes has a dull upper surface. Definitive separation requires examination of the genitalia of both sexes.
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Distribution
Holarctic: Europe and Northern Asia (excluding China), and North America. Distribution maps for Sweden have been published for this .
Similar Taxa
- Ilybius picipesHistorically treated as , but now recognized as distinct. I. picipes has a dull rather than aeneous upper surface and differs in genital of both sexes.
More Details
Taxonomic history
I. picipes was previously treated as a junior synonym of I. angustior. Lectotypes have been designated for both to stabilize .