Eubriinae

Lacordaire, 1857

Genus Guides

Acneus(water-penny beetles)
Dicranopselaphus(water-penny beetles)
Ectopria(water penny beetles)

Eubriinae is a of water penny beetles (Psephenidae) comprising approximately 15 and 144 , with greatest diversity in Asia. are distinguished by a convex body form, or pronotum with exposed , non-tapering maxillary palpus apex, and five abdominal ventrites. Larvae are aquatic and exhibit a metapneustic with positioned near the bases of paratergites VIII. The subfamily exhibits nearly worldwide distribution except Antarctica and some oceanic islands including New Zealand.

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Aquatic dryopoid beetles (Coleoptera) of the United States (Page 51) BHL3286878 (cropped) by Brown, Harley P.; Oceanography and Limnology Program (Smithsonian Institution); United States.. Used under a Public domain license.

Pronunciation

How to pronounce Eubriinae: //juˈbriːɪniː//

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Identification

distinguished from other Psephenidae by combination of: or pronotum with exposed (vs. head concealed in some groups); maxillary palpus with non-tapering apex; mesosternal process with truncate or emarginate apex; five abdominal ventrites. Larvae identified by paratergites VII not reaching segment IX, absence of external gills, and metapneustic respiration with near bases of paratergites VIII. Oriental keyed in Lee et al. 1993.

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Habitat

Larvae inhabit diverse lotic and lentic aquatic environments ranging from sluggish seeps to moderately swift streams and small rivers. Non-flattened, non-streamlined larval are predominantly associated with slowly flowing water. are primarily terrestrial, occurring in riparian vegetation and debris adjacent to larval .

Distribution

distribution across all major biogeographic regions except Antarctica. Absent from New Zealand and some oceanic islands. Greatest in Asia. In the Neotropics, confirmed South American records include Neoeubria and Tychepsephus, with Tychepsephus now documented from both Chile and Argentina.

Life Cycle

Larval development extends over multiple years. occurs almost exclusively in terrestrial environments. are short-lived, do not feed, and are restricted to terrestrial near larval waters.

Behavior

are non-feeding and short-lived, restricted to riparian vegetation and debris. documented in some .

Similar Taxa

PsepheninaeOther of Psephenidae; distinguished by larval characters including different paratergite and structure.
EubrianacinaeFormerly treated as within Psephenidae; and larval morphological differences in body form and pronotal structure.

More Details

Taxonomic history

Eubriinae was established by Lacordaire in 1857. The has undergone significant revision, with Oriental keyed by Lee et al. (1993) and Chilean fauna revised by Jäch et al. (2022). The genus Tychepsephus, previously considered to Chile, is now known from Argentina.

Larval morphology

Two distinct larval have been described within Tychepsephus, suggesting intraspecific or interspecific variation in body form that may correlate with microhabitat differences in current velocity.