Pseudocopaeodes eunus
(Edwards, 1881)
alkali skipper, Carson wandering skipper (for ssp. obscurus)
Pseudocopaeodes eunus is a rare to alkali flat in the western United States and Mexico. The comprises five recognized , with P. e. obscurus (Carson wandering skipper) federally listed as endangered due to habitat loss and extremely limited distribution. As of 2007, only four were known to persist. The species is highly specialized, with dependent on saltgrass as their sole documented .
Pronunciation
How to pronounce Pseudocopaeodes eunus: /ˌsudoʊˌkoʊpiˈoʊdiːz ˈjuːnəs/
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Identification
Small size (2.5–3.2 cm), yellowish-orange to brownish upper coloration, and strict association with alkali flat distinguish this from other western . The endangered P. e. obscurus is geographically restricted to eastern California and Nevada. Subspecific identification requires examination of or reference to locality.
Images
Appearance
are 2.5–3.2 cm in length. Upper surface is brownish to yellowish orange; underside is yellowish. No distinctive wing pattern elements are described in available sources.
Habitat
Restricted to alkali flats—saline-alkaline wetlands characterized by high soil pH and seasonal moisture. specificity is extreme; occurrence is tied to presence of larval saltgrass in these conditions.
Distribution
Northern California and Nevada (United States); Baja California (Mexico). have localized distributions: P. e. eunus in California; P. e. alinea in California; P. e. chromis in Mexico; P. e. obscurus in eastern California and Nevada; P. e. flavus in Nevada.
Diet
feeds exclusively on saltgrass (Distichlis spicata var. stricta). food sources are not documented in available literature.
Host Associations
- Distichlis spicata var. stricta - larval obligate association; only documented food source
Life Cycle
(, , , ). Specific and are not documented. site and stage are unknown.
Behavior
and activity patterns are poorly documented due to rarity and limited observation. No aggregative, territorial, or mating behaviors are described in available sources.
Ecological Role
Likely functions as a in its limited alkali flat . Larval on saltgrass represents a specialized trophic link in saline wetland . scarcity limits quantitative ecosystem impact.
Human Relevance
P. e. obscurus (Carson wandering ) is federally listed as endangered under the U.S. , making it subject to legal protection and recovery planning. destruction through wetland drainage, agricultural conversion, and urban development represents the primary threat. The has no known economic or cultural uses.
Similar Taxa
- Other Hesperiidae skippers in western North AmericaSimilar small size and orange- coloration; distinguished by specificity (alkali flats), association (saltgrass), and in some cases genitalic characters for identification
More Details
Conservation status
P. e. obscurus was federally listed as endangered in 2002. Critical has been designated. The extreme habitat specificity and small number of extant make this one of the most imperiled in North America.
Taxonomic history
Originally described as Copaeodes eunus by Edwards in 1881; transferred to Pseudocopaeodes. Five recognized based on geographic variation, with two (flavus, obscurus) described by Austin & Emmel in 1998.