Bothrideridae

Erichson, 1845

cocoon-forming beetles, dry bark beetles

Tribe Guides

2

is a of small to medium-sized beetles in the superfamily Coccinelloidea, commonly known as cocoon-forming beetles or dry bark beetles. Members are characterized by elongated, cylindrical to somewhat flattened bodies and are primarily found under tree bark in woodland . The family has undergone significant taxonomic revision, with former Teredinae, Xylariophilinae, and Anommatinae now placed in the separate family Teredidae. Bothrideridae has a worldwide distribution with greatest diversity in the Old World tropics. The family is notable for its ectoparasitoid larvae, which attack other wood-boring insects including cerambycid beetles, wood wasps, and carpenter bees. Several , particularly in the Dastarcus, are important biocontrol agents used commercially to manage forest pests such as the Japanese pine sawyer (Monochamus alternatus), a of .

Bothrideres cryptus by (c) Katja Schulz, some rights reserved (CC BY), uploaded by Katja Schulz. Used under a CC-BY license.Bothrideres cryptus by (c) Katja Schulz, some rights reserved (CC BY), uploaded by Katja Schulz. Used under a CC-BY license.Bothrideres cryptus by (c) Katja Schulz, some rights reserved (CC BY), uploaded by Katja Schulz. Used under a CC-BY license.

Pronunciation

How to pronounce Bothrideridae: /bɒθˈraɪdəˌdaɪ/

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Identification

can be distinguished from the superficially similar Teredidae (formerly included as ) by differences in mouthpart structure and larval . are separated from other Coccinelloidea by the combination of elongated body form, clubbed with 9–11 segments, and under bark. The family was historically confused with but is now recognized as unrelated. -level identification requires examination of genitalia and detailed morphological features; regional keys are available for North American fauna. The Dastarcus is distinguished by its large size relative to other bothriderids and its role as an ectoparasitoid of cerambycids.

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Habitat

Primarily found in woodland under the bark of dead or dying trees. inhabit the subcortical zone of various tree . Some species occupy subterranean habitats. The shows association with wood-boring insect in forest .

Distribution

Worldwide distribution with majority of native to the Old World tropics. Present in North America, Central America, South America, Europe, Asia, Africa, and Australia. Documented from England (Anommatus reitteri), Myanmar (fossil Alveoderes in mid-Cretaceous amber), and across East Asia including China, Korea, and Japan for economically important species such as Dastarcus helophoroides.

Diet

Larvae are ectoparasitoids of other insects, specifically attacking larvae and pupae of wood-boring beetles (Cerambycidae), wood wasps (Siricidae), and carpenter bees (Xylocopidae and related Apidae). feeding habits are poorly documented but likely involve subcortical microflora or -associated materials; some accept artificial diets in laboratory rearing.

Host Associations

Life Cycle

Complete with , larval, pupal, and stages. Eggs are laid near entrance holes or -extrusion holes. First instar larvae possess well-developed pectoral feet for active host foraging that degenerate after successful . Larvae feed externally as ectoparasitoids on host larvae or pupae. Developmental duration varies with temperature and host : egg stage approximately 12.7 days at 21°C, larval period 8–12 days, pupal/cocoon period 25–37 days. Multiple larvae may share a single host, with density-dependent effects on development time and adult . Adults are long-lived, with lifespans of 3–6 years reported for Dastarcus helophoroides. Two per year occur in wild of some .

Behavior

are primarily and positively phototactic. Females locate using olfactory cues, with sensitive chemosensory systems involving odorant binding proteins, chemosensory proteins, and odorant receptors. Visual cues also influence oviposition site selection; females can learn to associate substrate colors with oviposition sites. Copulation duration is highly plastic, responding to body size, mating history, kinship, sex ratio, mating sequence, feeding status, temperature, , and time of day. Inbred pairs and food-deprived couples exhibit longer copulations. occurs among larvae sharing hosts, with at low densities shifting to contest competition at higher densities.

Ecological Role

function as specialized natural enemies of wood-boring insects in forest . As ectoparasitoids, they regulate of primary wood decomposers and forest pests. Several are commercially mass-reared and released as biocontrol agents in programs, particularly for suppression of cerambycid of forest . The trade-off between numbers and body size in response to availability may stabilize . Their association with subcortical contributes to biodiversity in dead wood .

Human Relevance

Economically important as biocontrol agents for forest pest management. Dastarcus helophoroides is commercially produced and released to control Monochamus alternatus, the of (Bursaphelenchus xylophilus), in East Asian countries. Research focuses on optimizing mass-rearing techniques, including optimal larval (approximately 6 larvae per for maximum ), artificial diets, and storage methods. Venom proteins from D. helophoroides larvae show potential for development of environmentally safe pest control chemistries. The is of minor direct agricultural significance otherwise.

Similar Taxa

  • TeredidaeFormerly treated as (Teredinae, Xylariophilinae, Anommatinae) within ; now recognized as separate based on morphological and molecular evidence. Distinguished by differences in mouthpart structure and larval .
  • ColydiidaeHistorically confused with in older literature; now considered unrelated. typically exhibit more flattened body forms and different ecological associations.

More Details

Taxonomic History

The underwent major revision with the elevation of former Teredinae, Xylariophilinae, and Anommatinae to family rank as Teredidae. The remaining now comprises primarily the subfamily Bothriderinae. Fossil evidence includes Alveoderes from mid-Cretaceous Burmese amber (early Cenomanian) and Pseudobothrideres from Eocene European deposits, indicating ancient diversification of the lineage.

Genetic Research

Molecular studies have characterized olfactory in Dastarcus helophoroides, identifying odorant binding proteins, chemosensory proteins, odorant receptors, ionotropic receptors, receptors, and proteins with stage- and tissue-specific expression patterns. Methuselah-like genes associated with longevity, stress resistance, and have been identified, correlating with the extended lifespan of 3–6 years.

Commercial Production

Mass-rearing protocols utilize substitute such as Zophobas morio (Tenebrionidae) pupae. Optimal rearing of 6 larvae per host balances against production . Adults can be stored at low temperatures (5°C) for extended periods with minimal mortality, facilitating commercial distribution.

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