Nicrophorus tomentosus

Distinguished from congeners by the thick golden-yellow hair patch on the pronotum; N. orbicollis and N. marginatus lack this dense tomentum. Antennae entirely black (some congeners have orange-tipped antennae). Shallow burial behavior with leaf litter cover differs from complete burial typical of most Nicrophorus. Smaller average body size than N. orbicollis, with which it frequently co-occurs. Diurnal activity when searching for carrion contrasts with nocturnal habits of N. orbicollis.

Medium-sized beetle 11.2–19.0 mm in length. Body predominantly black with symmetrical orange markings on elytra. Pronotum densely covered with golden-yellow tomentose setae, creating a distinct "gold-necked" appearance. Antennae entirely black, clubbed at tips with olfactory organs. Fifth abdominal tergum bears paired striations. Scutellum large, sometimes as wide as the head. Elytral epipleuron black with orange splotches. Flight pattern resembles that of a bumble bee.

Forests, woodlands, shrublands, and sandy prairies. Requires presence of small vertebrate carcasses for reproduction. Frequently captured in baited traps in wooded habitats. In southeastern Ontario, breeds in both terrestrial and forest canopy environments.

North America: United States (widespread except southeastern region), southern Canada east of the Rocky Mountains (Manitoba, New Brunswick, Nova Scotia, Ontario, Quebec, Saskatchewan). GBIF records confirm presence in 38 US states and 6 Canadian provinces.

Adults active May through October; peak abundance July and August. Breeding period extends from late summer into fall, approximately 3–4 weeks versus 10 weeks for sympatric N. orbicollis. Unique among local Nicrophorus species in overwintering as prepupae, enabling later-season breeding.

Small vertebrate carcasses including rodents (rats, moles, voles), birds, and other small mammals. Adults and larvae consume carrion; parents feed larvae regurgitated, liquefied carrion. Adults have been observed to consume fly larvae (maggots) competing for carcass resources.

Eggs deposited in soil near carcass at least 12 hours after carcass discovery; hatch after approximately 4 days. Larvae move to feeding hole prepared by parents, fed regurgitated food by both parents for 6–8 days until fully developed. Larvae then burrow into surrounding soil to pupate. Adults emerge after 48–60 days. Overwinters as prepupa, unlike congeners that overwinter as adults.

Diurnal when searching for carrion; becomes active day and night once carcass is secured. Does not fully bury carcasses; excavates shallow pit beneath carcass and covers with leaf litter. Both parents cooperate in carcass preparation: removing hair or feathers, rolling carcass into ball, applying oral and anal secretions to retard decay and mask odor. Biparental care includes defending brood from conspecific and heterospecific competitors; if female dies, male assumes full care. Adults may cull excess larvae if carcass size is insufficient. Engages in aggressive interference competition; contest outcomes determined by body size rather than species identity or arrival order.

Carrion consumer and nutrient cycler; facilitates decomposition of small vertebrate remains. Competes for limited carcass resources with other Nicrophorus species and flies. Parental antimicrobial secretions and larval feces may suppress microbial competitors. Serves as prey or host for various parasites and predators.

Subject of ecological research on parental care, behavioral dominance, and resource competition. Occasionally captured in Japanese beetle pheromone traps baited with carrion. No documented agricultural or medical significance. Population trends unknown; not listed under conservation legislation.

• Nicrophorus orbicollisOverlaps in distribution and habitat; distinguished by larger size, nocturnal activity, complete carcass burial, and lack of dense golden pronotal setae. N. orbicollis typically behaviorally dominant due to larger size.
• Nicrophorus marginatusSympatric burying beetle; lacks golden pronotal tomentum and has different seasonal activity pattern.
• Nicrophorus americanusFederally endangered congener with orange pronotal patch (not golden setae); larger and restricted to specific states.

• burying beetle
• carrion beetle
• parental care
• decomposer
• Silphidae

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
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• Peer Review #1 of "Behavioral dominance interactions between Nicrophorus orbicollis and N. tomentosus burying beetles (Coleoptera: Silphidae) (v0.2)"
• Peer Review #2 of "Behavioral dominance interactions between Nicrophorus orbicollis and N. tomentosus burying beetles (Coleoptera: Silphidae) (v0.1)"
• Peer Review #3 of "Behavioral dominance interactions between Nicrophorus orbicollis and N. tomentosus burying beetles (Coleoptera: Silphidae) (v0.1)"
• Peer Review #1 of "Behavioral dominance interactions between Nicrophorus orbicollis and N. tomentosus burying beetles (Coleoptera: Silphidae) (v0.1)"