Digrammia excurvata

(Packard, 1874)

Digrammia excurvata is a of geometrid first described by Packard in 1874. It belongs to the Digrammia, which includes numerous North American species commonly known as granite moths. The species is documented from North America, though specific details regarding its and remain limited in published sources.

Digrammia excurvata, -26102, Det. R. Hannawacker, Fairview, Arizona. 20 June 1947, John L. Sperry (49551170586) by Robb Hannawacker. Used under a Public domain license.

Digrammia excurvata, -26405, det. R. Hannawacker, North Rim Grand Canyon, Arizona. 6 July 1940, Louis Schellbach III (49552405398) by Robb Hannawacker. Used under a Public domain license.

Pronunciation

How to pronounce Digrammia excurvata: //daɪˈɡræmiə ɛkˈskɜrvətə//

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Identification

Members of the Digrammia can be challenging to distinguish without close examination. D. excurvata is one of approximately 60 in this genus, many of which exhibit cryptic coloration and wing patterns that blend with rocky substrates. Definitive identification typically requires examination of genitalic structures or detailed wing pattern analysis. The specific epithet 'excurvata' may refer to a characteristic curvature in wing venation or body structure, though this requires verification.

Images

Distribution

North America. Specific range boundaries within North America are not well documented in available sources.

Behavior

are and have been observed at ultraviolet light sources, consistent with patterns documented for other Digrammia .

Similar Taxa

Digrammia muscariataAnother Digrammia frequently recorded at blacklighting events in California; both species share and similar preferences, though D. muscariata has been more commonly documented in recent surveys.
Digrammia californiariaClosely related with similar appearance and overlapping distribution in western North America; both have been observed at the same blacklighting stations.

More Details

Taxonomic History

Originally described as Phasiane excurvata by Packard in 1874, this was later transferred to the Digrammia. The genus Digrammia was revised in the 20th century, though comprehensive modern treatments remain limited.

Research Needs

Basic biological information including larval plants, precise geographic range, and distinguishing morphological characters require further study. The is represented by relatively few observations in public databases compared to more frequently encountered .