Ortholasma
Banks, 1894
Species Guides
4Ortholasma is a of harvestmen (Opiliones) in the Nemastomatidae, containing five described . The genus was established by Banks in 1894 and has been revised by Shear (2010). It is the type genus of the Ortholasmatinae. Species in this genus are small-bodied, short-legged dyspnoan harvestmen found in western North America.
Pronunciation
How to pronounce Ortholasma: /ɔːr.θoʊˈlæz.mə/
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Identification
Ortholasma can be distinguished from other nemastomatid harvestmen by their compact body form and relatively short legs compared to body length. The is characterized by specific features of the male genitalia, including the structure of the glans and stylus, as detailed in Shear's 2010 revision. The Ortholasmatinae, which contains only this genus, is distinguished from other Nemastomatidae by particular arrangements of ozopores and tarsal .
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Habitat
of Ortholasma have been documented in moist forested environments, including coastal and montane regions of western North America. They are typically found in leaf litter, under bark, and in other cryptic microhabitats that retain humidity.
Distribution
Western North America, with documented occurrences in coastal California, the Pacific Northwest, and montane regions extending into the Rocky Mountains.
Ecological Role
As small-bodied in forest floor , Ortholasma contribute to decomposition processes and nutrient cycling in their .
Similar Taxa
- NemastomaAlso in Nemastomatidae but in Nemastomatinae; Nemastoma generally have longer legs relative to body size and different male genitalia structure.
- TrogulusIn Trogulidae, not Nemastomatidae; Trogulus are generally larger with different body proportions and ecological preferences.
More Details
Taxonomic Revision
The was comprehensively revised by Shear (2010), which clarified boundaries and described new species, bringing the total to five described species.
Subfamily Placement
Ortholasma is the sole in the Ortholasmatinae, which was established to accommodate its distinct morphological characteristics separate from Nemastomatinae.