Strongylium atrum
Champion, 1887
Smooth Strongylium
Strongylium atrum is a of darkling beetle in the Tenebrionidae, Stenochiinae. It belongs to the Strongylium, a group of beetles commonly referred to as long-jointed beetles. The species has been documented in South America, with observations primarily from Brazil. Members of this genus are typically found on tree trunks and vegetation.
Pronunciation
How to pronounce Strongylium atrum: /strɔŋˈɡɪl.i.ʊm ˈæ.trəm/
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Identification
Members of Strongylium can be recognized by their elongated bodies and long legs with distinctly long tarsal segments (the "long-jointed" characteristic). Strongylium atrum specifically has been noted for its relatively smooth body surface compared to some . Accurate identification to level within Strongylium requires examination of genitalic characters and other fine morphological details.
Habitat
Has been observed on tree trunks in urban and semi-urban environments in southeastern Brazil. The broader Strongylium is associated with woody vegetation and forested .
Distribution
Documented from Brazil (São Paulo State, specifically Campinas). The Strongylium occurs more broadly in the Neotropics.
Seasonality
One documented observation from January 2011. No comprehensive seasonal data available.
Behavior
Has been observed dropping from tree trunks when disturbed, a common defensive in many arboreal beetles.
Similar Taxa
- Strongylium haemorrhoidaleClosely related within the same ; S. atrum has been noted as related to this species by . Distinguished by subtle differences in coloration and body surface texture.
- Lagriinae (subfamily)Formerly treated as the separate Lagriidae, now a of Tenebrionidae. Strongylium were historically associated with this group due to similar elongated body form and long legs, but differ in tribal and generic characteristics.
More Details
Taxonomic note
There is conflicting authorship information in sources: Catalogue of Life lists (Alb. & Schwein.) Sw., 1815 as an earlier combination with synonym status, while NCBI and other sources recognize Champion, 1887 as the accepted authority. The epithet "atrum" (Latin for "black") suggests dark coloration.
Taxonomic history
The Strongylium was formerly placed in the Lagriidae, which is now treated as the Lagriinae within Tenebrionidae. Strongylium is currently classified in the subfamily Stenochiinae, tribe Stenochiini.
Identification challenges
-level identification in Strongylium is difficult from photographs alone. Enrico Ruzzier has noted working on a revision of this , indicating ongoing taxonomic research.