Acilius sylvanus
Hilsenhoff, 1975
Woodland Predaceous Diving Beetle
Acilius sylvanus is a predaceous diving beetle described by Hilsenhoff in 1975. It belongs to the Dytiscidae, a group of aquatic beetles adapted for underwater . The is known from forested wetland in North America.
Pronunciation
How to pronounce Acilius sylvanus: /əˈsɪliəs sɪlˈveɪnəs/
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Identification
As a member of the Acilius, this likely possesses the characteristic elongated, streamlined body form and hind legs modified into flattened, oar-like swimming appendages typical of the genus. Specific diagnostic features distinguishing A. sylvanus from such as A. mediatus and A. semisulcatus are not documented in available sources.
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Habitat
The specific epithet 'sylvanus' (meaning 'of the forest') suggests association with woodland aquatic . Confirmed records from Manitoba and New Brunswick indicate presence in and temperate forest regions with suitable standing water bodies.
Distribution
Recorded from North America, with confirmed presence in Manitoba and New Brunswick, Canada. The full extent of its range within North America remains incompletely documented.
Similar Taxa
- Acilius mediatusOverlapping North American range; requiring careful examination of male genitalia and elytral for reliable separation.
- Acilius semisulcatusWidespread in similar ; morphological distinction relies on subtle differences in body proportions and male clasping structures.
More Details
Nomenclature
The was described by William L. Hilsenhoff in 1975, a in North American Dytiscidae.
Data Deficiency
Despite being a described with accepted taxonomic status, A. sylvanus appears poorly represented in ecological literature. The 56 iNaturalist observations suggest it is encountered infrequently or remains underreported relative to more common .