Taxonomic History (provided by Barry Bolton, 2020)
A cryptic inhabitant of forest floor leaf litter and rotten wood; from lowland rainforests; Mexico to Costa Rica.
Distribution: Geographic regions
(According to curated Geolocale/Taxon lists): Americas: Costa Rica
, Nicaragua Biogeographic regions
(According to curated Bioregion/Taxon lists): Neotropical
Mexico (Chiapas) to Costa Rica.
This species inhabits lowland rainforest, from sea-level to 1000 m elevation, but is most abundant below 500 m. All specimens are from samples of sifted leaf litter and rotten wood from the forest floor. Frequencies in quantitative samples of 1 m2 litter plots range from 0–16%. Dealate queens occasionally occur in samples, and one sample contained an alate queen. Worker number in samples is always < 10.
Antennal scrobe very shallow, not distinctly margined; face with arcuate carina; frontal carinae extending back and joining termini of facial arc. Octostruma convallis
is similar, but the frontal carinae and facial arc do not join. They are separated by a transverse trough, and the termini of the facial arc extend laterally beyond the termini of the frontal carinae.
The name refers to the lack of sharply delimited antennal scrobes.
Specimen Habitat Summary
Found most commonly in these habitats: 17 times found in tropical moist forest, 6 times found in tropical rainforest, 8 times found in 2º lowland tropical rainforest, 7 times found in mature wet forest, 5 times found in 2º lowland rainforest, 5 times found in tropical wet forest, 1 times found in Primary wet forest, 1 times found in ridgetop cloud forest, 1 times found in Sura, 1 times found in lowland rainforest, ...
Found most commonly in these microhabitats: 52 times ex sifted leaf litter, 1 times ex sifted leaf litter and rotten wood, 1 times bajo de M/20.
Collected most commonly using these methods: 39 times MiniWinkler, 11 times MaxiWinkler, 1 times winkler, 1 times Berlese, 1 times Berlese/Winkler, 1 times flight intercept trap, 1 times Mini Winkler.
Elevations: collected from 50 - 990 meters, 339 meters average
Collect Date Range: collected between 1985-08-29 and 2011-05-08
Type specimens: holotype Octostruma ascrobis Longino 2013: casent0611295; paratype Octostruma ascrobis Longino 2013: casent0611224, casent0611225, casent0611425, casent0611426
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