''Mezium'' is a genus of

beetle Beetles are insects that form the Taxonomic rank, order Coleoptera (), in the superorder Holometabola. Their front pair of wings are hardened into wing-cases, elytra, distinguishing them from most other insects. The Coleoptera, with about 40 ...

s in the subfamily

Ptininae Spider beetles make up the subfamily Ptininae, in the family Ptinidae. There are approximately 70 genera and 600 species in the subfamily, with about 12 genera and 70 species in North America north of Mexico. Spider beetles have round bodies wi ...

, the spider beetles. It is distributed throughout most of the world. There are two centers of distribution: an area extending from the

Iberian Peninsula The Iberian Peninsula ( ), also known as Iberia, is a peninsula in south-western Europe. Mostly separated from the rest of the European landmass by the Pyrenees, it includes the territories of peninsular Spain and Continental Portugal, comprisin ...

Morocco Morocco, officially the Kingdom of Morocco, is a country in the Maghreb region of North Africa. It has coastlines on the Mediterranean Sea to the north and the Atlantic Ocean to the west, and has land borders with Algeria to Algeria–Morocc ...

, including the

Canary Islands The Canary Islands (; ) or Canaries are an archipelago in the Atlantic Ocean and the southernmost Autonomous communities of Spain, Autonomous Community of Spain. They are located in the northwest of Africa, with the closest point to the cont ...

; and an area extending through central and southern

Africa Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surfac ...

. Several species are recently described African

endemics Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

.Borowski, J. (2009)
The spider beetles of the continental Africa (Coleoptera: Ptinidae). Part I – Genus ''Mezium'' Curtis.
''Studies and Reports of District Museum Pargue-East, Taxonomical Series'' 5, 1-10. They are most common in coastal areas, and in regions with a

Mediterranean climate A Mediterranean climate ( ), also called a dry summer climate, described by Köppen and Trewartha as ''Cs'', is a temperate climate type that occurs in the lower mid-latitudes (normally 30 to 44 north and south latitude). Such climates typic ...

. Their most common natural habitat type is

cave Caves or caverns are natural voids under the Earth's Planetary surface, surface. Caves often form by the weathering of rock and often extend deep underground. Exogene caves are smaller openings that extend a relatively short distance undergrou ...

s, where they feed on animal feces, especially

bat Bats are flying mammals of the order Chiroptera (). With their forelimbs adapted as wings, they are the only mammals capable of true and sustained flight. Bats are more agile in flight than most birds, flying with their very long spread-out ...

guano Guano (Spanish from ) is the accumulated excrement of seabirds or bats. Guano is a highly effective fertiliser due to the high content of nitrogen, phosphate, and potassium, all key nutrients essential for plant growth. Guano was also, to a le ...

. They are adaptable to human-made structures such as

barn A barn is an agricultural building usually on farms and used for various purposes. In North America, a barn refers to structures that house livestock, including cattle and horses, as well as equipment and fodder, and often grain.Allen G ...

s and

chicken coop Poultry farming is the form of animal husbandry which raises poultry, domesticated birds such as chickens, Domestic duck, ducks, turkey (domesticated), turkeys and domesticated goose, geese to produce chicken meat, meat or Egg as food, eggs for ...

s. Species include:''Mezium''.
Fauna Europaea. *'' Mezium affine'' – shiny spider beetle *'' Mezium africanum'' *'' Mezium americanum'' – American spider beetle, black spider beetle *'' Mezium andreaei'' *'' Mezium giganteum'' *'' Mezium glabrum'' *'' Mezium gracilicorne'' *'' Mezium horridum'' *'' Mezium namibiensis'' *'' Mezium pseudafricanum'' *'' Mezium pseudamericanum'' *'' Mezium setosum'' *'' Mezium sulcatum''

References

* * Ptinidae Polyphaga genera {{Bostrichoidea-stub