Tetraopes skillmani
Chemsak & Noguera, 2004
Skillman's Milkweed Longhorn
Tetraopes skillmani is a longhorn beetle (Cerambycidae: Lamiinae) described in 2004 from Arizona. It belongs to the Tetraopes, whose members are obligate on Asclepiadaceae plants. The type locality is near Duquesne in southeastern Arizona, where collectors found its host plant Sarcostemma sp. but did not encounter the beetles during the initial survey.
Pronunciation
How to pronounce Tetraopes skillmani: /ˈtɛtɹəoʊps ˈskɪlˌmɑːni/
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Identification
As a member of Tetraopes, this likely exhibits the -diagnostic traits of compact body form, enlarged that meet dorsally on the , and antennal bases positioned close together on a prominent . However, specific diagnostic features distinguishing T. skillmani from are not documented in available sources. The species is smaller than some relatives, based on comparison to T. discoideus described as "tiny little guys" from the same region.
Habitat
Associated with Sarcostemma sp. ( Asclepiadaceae, milkweed ) in southeastern Arizona. The type locality occurs in desert thorn-scrub at intermediate elevations in the "Sky Islands" region of the Sonoran Desert.
Distribution
Known from the United States, specifically from the type locality near Duquesne, Cochise County, Arizona. No additional records are confirmed in available sources.
Seasonality
activity likely coincides with monsoon season (July–August), based on collecting dates for in the same region. The unsuccessful search attempt occurred in early August.
Diet
Larvae are presumed to feed internally on roots of Sarcostemma sp. (milkweed ), following the obligate association pattern of the Tetraopes. likely feed on milkweed tissues and flowers.
Host Associations
- Sarcostemma sp. - obligate larval plantConfirmed at type locality; is in Asclepiadoideae
Life Cycle
Complete with internal root-feeding larval stage typical of Tetraopes. Specific developmental timing unknown, but likely follows the pattern of other milkweed longhorns with summer .
Behavior
are likely and active on plants. No specific behavioral observations are documented.
Ecological Role
As a milkweed , likely participates in the coevolved of Asclepiadaceae herbivores. The Tetraopes sequesters cardiac glycosides from plants, making chemically protected.
Similar Taxa
- Tetraopes discoideusOccurs sympatrically in southeastern Arizona and shares milkweed association; T. discoideus is notably smaller and has been collected on Asclepias stems at higher elevations
- Other Tetraopes speciesApproximately 15 North American share the compact body form, enlarged , and milkweed specialization; geographic range and plant identity provide primary separation
More Details
Type locality
The was described from material collected near Duquesne, Arizona, in the vicinity of the Patagonia Mountains. The collecting narrative notes this as "the type locality" but records that beetles were not found despite locating the plant, suggesting the original type series may have been collected at a different time or nearby location.
Etymology
Named in honor of an individual with surname Skillman; specific etymology not detailed in original description.
Conservation status
No formal assessment available. The restricted known range and specialized plant association suggest potential vulnerability to modification.