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Species: Octostruma excertirugis   Longino, 2013 

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Taxonomic History (provided by Barry Bolton, 2021)

Octostruma excertirugis Longino, 2013b PDF: 30, figs 1F, 3E, 5G, 12B, 14F, 23, 43 (w.q.) GUATEMALA. Neotropic. AntCat AntWiki


A cryptic inhabitant of forest floor leaf litter and rotten wood; lowland rainforest of Central America and Ecuador. // Distribution


  Geographic regions (According to curated Geolocale/Taxon lists):
    Americas: Argentina, Belize, Costa Rica, Ecuador, Guatemala, Honduras, Mexico, Nicaragua, Panama
  Biogeographic regions (According to curated Bioregion/Taxon lists):

Distribution Notes:

Mexico (Chiapas) to Costa Rica.


Octostruma excertirugis is a moderately abundant lowland species from Mexico to Costa Rica. All records are from sea level to 800 m. It occurs in mature to highly disturbed rainforest and in seasonal moist forest. All collections are from Berlese and Winkler samples of sifted litter and rotten wood from the forest floor. In quantitative 1 m2 litter plot samples, it can occur in up to 16% of samples and is as or more abundant in second growth forest than in mature forest. Dealate queens are occasionally found together with workers in litter samples.


Face lacking transverse arcuate carina; basal five teeth of mandible bluntly rounded; face sculpture longitudinally rugose; ground pilosity fully appressed; first gastral tergite punctate on anterior half, fading to nearly smooth and shining posteriorly.


The name refers to the pronounced rugae on the face, that often project through the soil layer.

Specimen Habitat Summary

Found most commonly in these habitats: 21 times found in 2º wet forest, 14 times found in tropical rainforest, 17 times found in mature wet forest, 14 times found in tropical moist forest, 9 times found in 2º lowland rainforest, 8 times found in tropical wet forest, 1 times found in coffee plantation, 5 times found in wet forest, 7 times found in lowland rainforest, 4 times found in 2º lowland tropical rainforest, ...

Found most commonly in these microhabitats: 118 times ex sifted leaf litter, 1 times ex log litter, 4 times ex sifted litter, 1 times nest in rotten wood, 1 times at bait, 1 times rotten flowers of Pseudobombax, 1 times Malaise trap, 1 times leaf litter, 1 times Hojarasca, 1 times ex soil & fungus litter, 1 times ex sifted leaf litter and rotten wood, ...

Collected most commonly using these methods: 66 times MiniWinkler, 37 times MaxiWinkler, 12 times Berlese, 13 times Winkler, 1 times search, 1 times baiting, 1 times Malaise, 1 times Mini Winkler.

Elevations: collected from 26 - 1010 meters, 302 meters average

Collect Date Range: collected between 1943-02-01 and 2019-07-03

Type specimens: holotype Octostruma excertirugis Longino 2013: casent0629828; paratype Octostruma excertirugis Longino 2013: casent0610160, casent0610161, casent0611289, casent0611290, casent0611291, casent0629829, casent0629830, casent0629831, casent0629832

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