Oxelytrum

Gistel, 1848

carrion beetles

Species Guides

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Oxelytrum is a of carrion beetles in the Silphidae, containing approximately 10 described distributed primarily in South America. Members are characterized by three distinct ridges on each , a hairless pronotal disk, and 3-segmented antennal clubs. Most species are and associated with decomposing animal remains. The genus has forensic significance due to predictable patterns on carcasses.

Oxelytrum by (c) Arthur de Jesús Chavarría Pérez, some rights reserved (CC BY), uploaded by Arthur de Jesús Chavarría Pérez. Used under a CC-BY license.Oxelytrum discicolle cropped by Diogo Luiz. Used under a CC BY-SA 4.0 license.F6-2 Oxelytrum discicolle (4) by NHM Beetles and Bugs. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Oxelytrum: //ˌɒksɪˈlaɪtrəm//

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Identification

Distinguished from other Silphidae by the combination of three elytral ridges per , glabrous pronotal disk, and 3-segmented antennal clubs. The ridged elytra separate it from the related Nicrophorus, which has smooth or differently sculptured elytra.

Images

Appearance

Medium to large carrion beetles, usually black with reddish markings. Each bears three longitudinal ridges. The pronotal disk lacks hairs. terminate in 3-segmented clubs.

Habitat

Associated with carrion and decomposing animal remains in forested environments. Documented from terra firme forests in Amazonia and peri-urban forest settings.

Distribution

Primarily South America, with records from Brazil, French Guiana, and other Neotropical regions. Specific locality records include Manaus, Amazonas, Brazil.

Seasonality

Activity influenced by rainfall; Oxelytrum discicolle shows significantly higher abundance during the rainy season.

Diet

Necrophagous; and larvae feed on decomposing animal remains. Adults of O. cayennense have been observed preying on dipteran larvae.

Host Associations

  • Sus scrofa - carrion resourcecolonizes pig carcasses from bloated to skeletonized stages
  • Diptera larvae - prey prey on fly larvae at carcass sites

Life Cycle

Development tied to carcass decomposition stages. colonize remains early (from day 2 postmortem in O. cayennense); larvae appear later (from day 5 postmortem) and feed on skeletonized areas.

Behavior

activity pattern; of O. discicolle are trapped 17 times more frequently at night than during day. Shows preference for carcasses at advanced decomposition stages.

Ecological Role

Carrion decomposer facilitating nutrient cycling; of dipteran larvae at carcass sites; forensic for estimating postmortem interval.

Human Relevance

Forensic importance: both and larval stages serve as postmortem interval indicators due to predictable timing on remains. Adult on fly larvae can complicate forensic analyses that rely on dipteran developmental stages.

Similar Taxa

  • NicrophorusBoth are carrion-associated Silphidae, but Nicrophorus lacks the three elytral ridges and has differently structured ; Nicrophorus also typically show parental care not documented in Oxelytrum.

More Details

Forensic application

Both life stages of O. cayennense have demonstrated potential as postmortem interval indicators: colonize from day 2 postmortem, larvae from day 5 postmortem.

Taxonomic note

Some sources erroneously place this in Staphylinidae; it is correctly classified in Silphidae.

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Sources and further reading