Necrobia rufipes

(De Geer, 1775)

red-legged ham beetle

Necrobia rufipes is a clerid known for infesting dried and cured animal products. are metallic blue-green with distinctive red legs and . The is a significant pest of stored protein-rich foods including dried fish, ham, bacon, cheese, and pet food. Both larvae and adults feed on these substrates, with larvae causing most damage by boring into materials. The species has forensic importance as an indicator of advanced decomposition stages on carcasses.

Necrobia rufipes by (c) Henrik Kibak, some rights reserved (CC BY), uploaded by Henrik Kibak. Used under a CC-BY license.Necrobia rufipes side by Siga. Used under a CC BY-SA 3.0 license.Necrobia rufipes hind tarsus by Siga. Used under a CC BY-SA 3.0 license.

Pronunciation

How to pronounce Necrobia rufipes: /nɛˈkroʊbiə ˈruːfɪˌpɛz/

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

Identification

The combination of metallic blue-green body with red legs and distinguishes N. rufipes from . Necrobia violacea has all-dark legs and antennae. Necrobia ruficollis has light-colored bases of the (shoulders). Korynetes caeruleus, another blue clerid, lacks red legs. The punctate body surface and convex shape aid recognition.

Images

Habitat

Found in stored product environments, particularly where protein-rich animal materials are stored. Occurs in warehouses, food processing facilities, pet food stores, museums, and taxidermy operations. Associated with dried, smoked, or cured meats and fish, hides, bones, copra, dried , cheese, guano, bone meal, and palm nut kernels. In natural settings, occurs on carcasses in advanced decay and dry remains stages.

Distribution

distribution worldwide. Recorded across multiple continents including North America, South America, Europe, Africa, and Asia. Specific records from Brazil, Burkina Faso, Turkey, Nigeria, and the Galápagos Islands.

Seasonality

Year-round activity in stored product environments where temperature is controlled. Development rate temperature-dependent: 20–32°C supports complete , with faster development at higher temperatures within this range.

Diet

Feeds on protein-rich dried and cured animal products. Larvae consume dry or smoked meats, bacon, fish flour, dog food pellets, and hide. are surface feeders on same substrates. In natural settings, feeds on dried remains of carcasses including bones, hides, and desiccated tissue. Preys on larvae of Calliphoridae (blow flies), Dermestidae, and Piophilidae in carrion contexts.

Life Cycle

Completes development from to through four larval instars, pre-pupal stage, and pupal stage. Embryonic development approximately 72 hours under ambient conditions. Larval duration temperature-dependent: 37.8 days at 32°C to 102.6 days at 20°C. Pre-pupae move to loose substrates (fish flour, dog food pellets) and secrete white adhering substance forming protective shell for . Adults emerge inactive for 1–3 days before becoming agile.

Behavior

exhibit aggressive mating with multiple males simultaneously attempting copulation with same females. Adults and larvae enter pet food packaging primarily through air vent valves on bottom. Adults and larvae are agile runners. Under confinement stress, adults display and decapitation despite food availability. Larvae bore into substrates while adults remain surface feeders.

Ecological Role

Necrophagous contributing to decomposition of dried animal remains. on other carrion-associated insects including fly and larvae. Pest of stored protein-rich products. Forensic for post-mortem interval estimation in advanced decay and skeletonization stages.

Human Relevance

Major pest of dried and salt fish including herring; significant economic damage to stored food products. Pest in pet food industry causing product loss and . Pest in museums and taxidermy businesses. Forensic importance for criminal investigations—presence indicates extended post-mortem interval. Documented threat to agriculture by 1925. Refrigeration reduced impact on fresh meats but not on dried products.

Similar Taxa

  • Necrobia violaceaSimilar metallic blue body but has all-dark legs and ; less destructive than N. rufipes
  • Necrobia ruficollisSimilar overall appearance but has light-colored bases of (shoulders); less destructive than N. rufipes
  • Korynetes caeruleusAnother steely-blue clerid ; lacks red legs; both have forensic significance but for different reasons

Sources and further reading