ColeopteraPtinidae – Death-watch and Spider Beetles

Shiny Spider Beetle

Mezium affine

This record describes Mezium affine (species). Recorded family: Ptinidae. Recorded order: Coleoptera.

Identification and Appearance

Shiny Spider Beetle - Mezium affine
Contributed by Boris Büche; Additional contributions by Mike Quinn , v belov

see here and earliest record in our area: ne. US 1904

Identification notes

see here and

Classification

Kingdom
Animalia
Phylum
Arthropoda
Class
Insecta
Order
Coleoptera (Beetles)
Suborder
Polyphaga
Superfamily
Bostrichoidea
Family
Ptinidae (Death-watch and Spider Beetles)
Subfamily
Ptininae
Tribe
Meziini
Genus
Mezium

Imported taxonomy record. Source availability varies; see the source references and editorial policy below.

Habitat and Range

Habitat

As in M. americanum

Geographic Range

mostly nothern and southern latitudes. In Canada, NS to SK; BC - Map

Additional species information

Species notes from the sources

Etymology: Mezium affine Boieldieu 1856

About Primitive Winged Insects: the wider group

Order-level background for Coleoptera, the group containing Mezium affine. Species-specific details appear above.

Group overview

Coleoptera is the largest order of insects with over 400,000 described species, representing ~25% of all known animal species and ~40% of all insects. In the U.S. alone, nearly 30,000 beetle species have been identified.

Ecological role of the group

Beetles are prominent decomposers, especially in forests, breaking down dead wood and recycling nutrients. As predators, they reduce populations of pest insects. Many species are also important pollinators of flowering plants.

Economic and practical significance of the group

Beetles have major economic significance: leaf beetles (Chrysomelidae) and weevils (Curculionoidea) are among the most destructive agricultural pests globally, costing billions annually, while predatory species like ladybugs provide natural pest control.

Recorded sources for this group: Britannica, Smithsonian, NCSU Entomology. Imported estimates may describe particular regions or reporting periods.

Explore Coleoptera families and species →

Photos of Shiny Spider Beetle (2)

Shiny Spider Beetle - photo 1
Contributed by Boris Büche; Additional contributions by Mike Quinn , v belov
Shiny Spider Beetle - photo 2
Contributed by Boris Büche; Additional contributions by Mike Quinn , v belov

Photo credits: Contributed by Boris Büche; Additional contributions by Mike Quinn , v belov

Frequently Asked Questions About Shiny Spider Beetle

What is Shiny Spider Beetle?

Shiny Spider Beetle (Mezium affine) is a species in the family Ptinidae, within the order Coleoptera.

How big is Shiny Spider Beetle?

2.5–3.4 mm

How do you identify Shiny Spider Beetle?

see here and

Where is Shiny Spider Beetle found?
FeatureDetails
HabitatAs in M. americanum
Rangemostly nothern and southern latitudes. In Canada, NS to SK; BC - Map

How we use and review source data. Source count does not imply independent verification.

Photo credits: Contributed by Boris Büche; Additional contributions by Mike Quinn , v belov. Contributors retain copyright over their individual contributions.