Siro exilis
Hoffman, 1963
Siro exilis is a of mite harvestman (order Opiliones, suborder Cyphophthalmi) in the Sironidae. The species was first described by Hoffman in 1963 and is currently recognized as a synonym of Neosiro exilis. It occurs in North America, with records from counties in Garrett, Giles, Mercer, Montgomery, and Pendleton. As a cyphophthalmid harvestman, it belongs to a group of small, eyeless arachnids that inhabit moist microhabitats in forested environments.
Pronunciation
How to pronounce Siro exilis: //ˈsi.ro ɛkˈsi.lɪs//
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Identification
As a member of the suborder Cyphophthalmi, Siro exilis lacks and possesses a body showing no constriction between the and . -level identification within Sironidae requires examination of genital , specifically the structure of the spermatopositor in males and the spermathecae in females. The Neosiro (to which this species has been transferred) is distinguished from the genus Siro by subtle differences in tarsal claw structure and genital morphology. Accurate identification requires comparison with or expert taxonomic revision.
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Habitat
Based on documented occurrences in the Appalachian region (Garrett, Giles, Mercer, Montgomery, and Pendleton counties), this inhabits moist, forested environments. Cyphophthalmid harvestmen generally require high humidity and are typically found in leaf litter, soil crevices, and under rocks or decaying wood in mature forest systems.
Distribution
North America. Documented from five counties: Garrett (likely Maryland or West Virginia), Giles (Virginia), Mercer (West Virginia or Pennsylvania), Montgomery (Virginia or West Virginia), and Pendleton (West Virginia). These locations suggest a core range in the central Appalachian Mountains.
Similar Taxa
- Neosiro koyukukensisAnother North American in the same , distinguished by geographic distribution (Alaska/Yukon region) and subtle differences in male genital .
- Siro rubensPreviously classified in the same ; differs in genital structure and geographic distribution (European ).
- Other Cyphophthalmi genera (e.g., Stylocellus, Parasiro)Superficially similar eyeless body form, but distinguished by -level characters including tarsal segmentation, ozopore position, and genital .
More Details
Taxonomic Status
Siro exilis is currently treated as a synonym of Neosiro exilis in major taxonomic databases (Catalogue of Life, GBIF). The transfer from Siro to Neosiro reflects ongoing revision of sironiid based on molecular and morphological data.
Data Limitations
Only 5 observations are documented in iNaturalist, and no published ecological or behavioral studies specific to this were located. Most information is inferred from the broader of Cyphophthalmi and Sironidae.