Tragidion deceptum

Swift & Ray, 2008

Tragidion deceptum is a () described by & Ray in 2008 during a comprehensive taxonomic revision of the . It occurs in montane of the southwestern United States and northern Mexico, where it breeds in recently dead oak branches. The exhibits of tarantula hawk (: Pepsis, Hemipepsis), with bright orange-red and black coloration. It is one of several Tragidion species historically confused under the name T. 'annulatum' prior to the 2008 revision.

Tragidion deceptum by Andrew Meeds. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Tragidion deceptum: //trəˈɡɪ.di.ən dɪˈsɛp.təm//

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Identification

Distinguished from the T. densiventre by having four rather than five elytral , costae not curving inward toward the , costae extending only to one-third of (versus near ), and broader black . Females further distinguished by annulated versus all-black . Males distinguished by black versus red- , legs, and . Distinguished from T. agave and T. armatum by ribbed (not smooth) elytra. Distinguished from T. annulatum (California/Baja California) by geographic range and preference.

Images

Habitat

Montane in the desert southwest, including oak woodlands and mixed conifer-oak forests at higher elevations. Found in canyons and mountain slopes with Quercus . Occurs in areas with sufficient moisture to support oak vegetation, distinct from the xeric lowland desert habitats of T. densiventre.

Distribution

Southwestern United States (Arizona, New Mexico, Texas) and northern Mexico. Specifically recorded from montane areas including the Huachuca Mountains of southeastern Arizona.

Seasonality

have been collected in association with summer monsoon season (July-August) in southeastern Arizona. One record from August 2, 2003 at 10-1200 hours suggests activity.

Diet

feed on sap oozing from stems of Baccharis sarothroides (Asteraceae) and flowers of larval plants. Specific larval diet consists of heartwood of recently dead Quercus branches.

Host Associations

Quercus - larval breeds in recently dead branches
Baccharis sarothroides - feeding siteaggregates on sap oozing from stems

Life Cycle

Larval development occurs in recently dead branches of Quercus , mining the heartwood. emerge and have been observed feeding on sap flows and flowers.

Behavior

aggregate on sap oozing from Baccharis sarothroides stems. In lower canyons bordering desert , has been collected feeding alongside T. densiventre on the same Baccharis plants. One of several Tragidion attracted to fermenting molasses traps. Exhibits of tarantula hawk , with coloration and presumably matching these models.

Ecological Role

Contributes to decomposition of dead oak wood through larval feeding. sap-feeding on Baccharis may facilitate . As a mimic of tarantula hawk , may influence learning and dynamics involving aposematic models.

Human Relevance

Popular among due to large size and attractive coloration. Has caused taxonomic confusion historically, leading to misidentifications in collections and literature. The 2008 revision clarified its status as distinct from T. densiventre and other southwestern .

Similar Taxa

Tragidion densiventre in southwestern deserts; distinguished by five elytral curving toward , narrower black , all-black female , and red- male /legs/
Tragidion agaveOccurs in California and Baja California; has smooth without , breeds in dead Agave and Yucca stalks
Tragidion armatumOccurs in lowland desert ; has smooth , breeds in dead Yucca and Agave flower stalks
Tragidion annulatumRestricted to California and Baja California; attracted to brushfires and burning vegetation, where may be killed by melting to hot surfaces

Misconceptions

Historically confused with T. 'annulatum' lato; in Arizona, New Mexico, and Texas previously attributed to T. annulatum were found to comprise two distinct —T. densiventre in lowland and T. deceptum in montane habitats. The name T. deceptum refers to this historical deception in species identification.

More Details

Taxonomic history

Described as new in 2008 by & Ray during the first comprehensive revision of the Tragidion. The specific epithet 'deceptum' alludes to the long-standing confusion between this species and related , particularly the misapplication of the name T. annulatum to southwestern .

Mimicry complex

Part of a system involving tarantula hawk (: Pepsis and Hemipepsis). The bright orange-red and black coloration matches these venomous wasp models. Observed in field situations with both model and mimic present at sap-feeding sites.

Collection methods

Successfully collected using fermenting molasses traps, one of few Tragidion for which this method is documented (also T. coquus in eastern North America).