Episernus trapezoideus
(Fall, 1905)
Episernus trapezoideus is a small in the Ptinidae (death-watch and spider beetles). It occurs in northwestern North America, with confirmed records from Alaska and British Columbia. The species was described by Fall in 1905. Available information on its and is extremely limited.
Pronunciation
How to pronounce Episernus trapezoideus: /ˌɛpɪˈsɜrnəs ˌtræpɨˈzɔɪdiːəs/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Episernus are small, compact beetles with a somewhat rounded to trapezoidal body shape. The specific epithet "trapezoideus" suggests a trapezoidal outline. Members of this can be distinguished from related Ptinidae by antennal structure and pronotal form, though precise diagnostic features for E. trapezoideus require examination.
Distribution
North America: Alaska (United States) and British Columbia (Canada). Distribution appears restricted to the Pacific Northwest region.
Similar Taxa
- Other Episernus speciesCongeneric share compact body form and antennal structure; separation requires examination of subtle morphological details such as pronotal margins and elytral punctation.
- Ptinus speciesSpider beetles in the Ptinus overlap in size and general habitus; Episernus differs in having more compact, less elongate body form and different antennal club structure.
More Details
Taxonomic note
placement has varied between Ptinidae and Anobiidae depending on classification system used. GBIF records this under Anobiidae, while iNaturalist and recent treatments place it in Ptinidae. The species is rarely encountered, with only three observations documented on iNaturalist as of the knowledge cutoff.