Cucujoidea

Latreille, 1802

flat bark beetles, fungus beetles, sap beetles

Family Guides

Cryptophagidae(silken fungus beetles)
Cucujidae(flat bark beetles)
Cybocephalidae
Erotylidae(Pleasing Fungus Beetles)
Kateretidae(Short-winged Flower Beetles)
Laemophloeidae(Lined Flat Bark Beetles)
Monotomidae(Minute Clubbed Beetles)
Nitidulidae(sap beetles)
Passandridae(Parasitic Flat Bark Beetles)

Cucujoidea is a superfamily of beetles within the infraorder Cucujiformia, comprising 25 extant and two extinct families. This group includes , flat bark beetles, sap beetles, and diverse lineages of 'bark beetles' unrelated to the true bark beetles (Scolytinae, Curculionoidea). Members exhibit varied without unifying external features, though share internal characteristics including open procoxal cavities and specific tarsal formulas. The superfamily formerly encompassed families now placed in Coccinelloidea. Ecologically, most have cryptic habits in fungi, leaf litter, or dead wood, with some lineages associated with flowers or stored food products.

Damaeus by (c) Alexis Tinker-Tsavalas, some rights reserved (CC BY), uploaded by Alexis Tinker-Tsavalas. Used under a CC-BY license.

Epidermoptidae by (c) Cricket Raspet, some rights reserved (CC BY), uploaded by Cricket Raspet. Used under a CC-BY license.

Psoroptidae by (c) Oleksii Vasyliuk, some rights reserved (CC BY), uploaded by Oleksii Vasyliuk. Used under a CC-BY license.

Pronunciation

How to pronounce Cucujoidea: /kʊˈkuːdʒɔɪˌdeɪə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from other cucujiform superfamilies by combination of internal characters: open procoxal cavities, concealed female tergite VIII, membranous male tergite X, and specific tarsal formulas. Distinguished from Coccinelloidea (which formerly included many of its ) by molecular and morphological phylogenetic evidence. Diverse 'bark beetle' lineages within Cucujoidea are not true bark beetles (Scolytinae, Curculionoidea) and lack the rostrum characteristic of weevils.

Images

Habitat

Predominantly cryptic : fungi, leaf litter, and dead wood. Some in flowers (Kateretidae, some Phalacridae). Nitidulidae particularly varied: saprophagous and mycetophagous , plus carrion, flower, insect nest, and stored food associations. Cavognathidae inhabit bird nests.

Distribution

distribution encompassing all major biogeographic regions. Specific distributions vary: Tasmosalpingidae to Australia; Cavognathidae in Argentina and adjacent countries; Helotidae in Asia with records from China, Chongqing, and elsewhere.

Diet

Predominantly mycetophagous (fungus-feeding) and saprophagous. Kateretidae and some Phalacridae feed on flowers. Some Nitidulidae associated with carrion, insect nests, or stored food products. Sphindidae feed on myxomycetes (slime molds).

Life Cycle

Complete with , larval, pupal, and stages. Larvae of most develop in fungi, leaf litter, or dead wood. Cavognathidae larvae found in bird nests with multiple instars observed. Specific developmental details vary among families.

Behavior

Cryptic habits with most concealed in microhabitats. Nitidulidae exhibit behavioral diversity matching their varied ecological associations. Cavognathidae most abundant in closed mud nests of Furnarius rufus, larvae in wood nest boxes. activity in some lineages.

Ecological Role

Decomposers in forest through consumption of fungi and decaying organic matter. Early-diverged lineages include among the first of gymnosperms and early angiosperms appearing by late Jurassic. Some are pests of stored products.

Human Relevance

Some Nitidulidae are pests of stored food products. Historical ship-timber pest in related groups (Lymexylidae, sometimes associated with Cucujoidea). Subject of extensive taxonomic and phylogenetic study due to morphological diversity and evolutionary significance.

Similar Taxa

CoccinelloideaFormerly included within Cucujoidea; separated based on molecular and morphological phylogenetic evidence. Lady beetles (Coccinellidae) now placed in Coccinelloidea.
CurculionoideaTrue bark beetles (Scolytinae) are weevils with rostrum, unlike the diverse 'bark beetle' lineages within Cucujoidea which lack this structure.
ChrysomeloideaClose phylogenetic relationship supported by sperm ultrastructure and molecular data; distinguished by morphological and ecological differences.

Misconceptions

The term 'bark beetles' has been applied to unrelated lineages within Cucujoidea, causing confusion with true bark beetles (Scolytinae, Curculionoidea). These groups are not closely related and differ fundamentally in and classification.

More Details

Taxonomic Composition

25 extant : Agapythidae, Boganiidae, Cavognathidae, Cryptophagidae, Cucujidae, Cybocephalidae, Cyclaxyridae, Erotylidae, Helotidae, Hobartiidae, Kateretidae, Laemophloeidae, Lamingtoniidae, Monotomidae, Myraboliidae, Nitidulidae, Passandridae, Phalacridae, Phloeostichidae, Priasilphidae, Protocucujidae, Silvanidae, Smicripidae, Sphindidae, Tasmosalpingidae. Two extinct families: †Parandrexidae, †Wabbelidae.

Phylogenetic Significance

Sperm ultrastructure studies confirm close relationship with Chrysomeloidea and Curculionoidea. Fossil record includes †Alloterocucus from Burmese amber (mid-Cretaceous) and extinct from Middle Jurassic-Early Cretaceous and Eocene.

Collecting Methods

Beating vegetation, blacklighting, and rearing from wood are effective techniques for collecting cucujoid beetles, particularly those associated with dead wood and fungi.