Dicranopselaphus
Guérin-Méneville, 1861
water-penny beetles
Dicranopselaphus is a of water-penny in the , comprising over 40 described . The genus exhibits a disjunct distribution spanning Asia and North America. Members are aquatic beetles with distinctive flattened, oval larval forms adapted to clinging to submerged surfaces in flowing water.
Pronunciation
How to pronounce Dicranopselaphus: /dɪˌkrænoʊˈsɛləfəs/
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Identification
of Dicranopselaphus can be distinguished from other by their dorsoventrally flattened, disc-like body form with expanded margins, earning the 'water-penny '. Specific -level identification requires examination of and other subtle morphological characters described in taxonomic revisions by Lee, Yang, and Satô.
Habitat
Aquatic environments, particularly streams and rivers with flowing water. attach to submerged rocks, woody debris, and other hard substrates in well-oxygenated waters.
Distribution
Asia (China, India, Indonesia, Japan, Laos, Malaysia, Myanmar, Nepal, Philippines, Singapore, Taiwan, Thailand, Vietnam) and North America (Mexico, USA: Alabama). The distribution is notably disjunct between these regions.
Ecological Role
function as grazers or on submerged substrates in freshwater , contributing to and serving as for aquatic .
Similar Taxa
- PsephenusAlso in with water-penny ; distinguished by and larval morphological differences in and body proportions
- EubriaAnother psephenid ; Dicranopselaphus differs in antennal structure and larval marginal setation patterns
More Details
Taxonomic history
The was established by Guérin-Méneville in 1861 with from Mexico. Major revisions were conducted by Lee, Yang, and Satô in 1996 and 2000, describing numerous Asian species and clarifying species boundaries.
Species diversity
Over 40 have been described, with the majority occurring in Southeast Asia. The species is Dicranopselaphus lesueurii Guérin-Méneville, 1861 from Mexico.