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Sampling of Octostruma is less thorough in South America than in Central America, but specimens that match the morphology of O. amrishi occur in lowland to midmontane rainforest in northern South America and throughout the Amazonian lowlands. Specimens from the southern portion of the range, including Amazonian Brazil and the eastern and western foothills of the Ecuadorian Andes, show reduced punctation on the first gastral tergite, becoming smooth and shining on a variable extent of the posterior portion of the tergite. See additional comments under O. balzani.
Although O. amrishi was poorly characterized in the original description, the characteristic setal pattern can be seen on the figures in the original publication.
15 Oct 2017: Molecular evidence now shows that "amrishi" as defined by Longino 2013 is polyphyletic. Costa Rican "amrishi" is sister to gymnogon. Panamanian "amrishi" are more related to trithrix and various balzani-like forms.
Found most commonly in these habitats: 80 times found in mature wet forest, 66 times found in montane wet forest, 40 times found in ridgetop cloud forest, 11 times found in forest, 18 times found in tropical wet forest, 18 times found in seasonally wet 2° tropical forest, 21 times found in tropical rainforest, with some big trees, probably a mix of primary and secondary forest, 20 times found in tropical rainforest, with big trees, probably primary, 7 times found in cloud forest, 4 times found in tropical rainforest, ...
Found most commonly in these microhabitats: 298 times ex sifted leaf litter, 10 times Hojarasca, 4 times litter, 11 times leaf litter, 1 times nesting in dead snails, 1 times in Guadua litter, 3 times forest floor leaf litter, 1 times ex soil & fungus litter, 2 times sifted litter (leaf mold, rotten wood), 1 times rotten flowers of Pseudobombax, 1 times Parcelas susecionales, Suelo, ...
Collected most commonly using these methods: 230 times MiniWinkler, 37 times Berlese, 32 times MaxiWinkler, 19 times Winkler, 8 times litter sample, 6 times Mini Winkler, 2 times Winkler sample, 2 times baiting, 1 times search.
Elevations: collected from 5 - 1470 meters, 520 meters average