Pachyschelus purpureus
(Say, 1833)
Species Guides
2Pachyschelus purpureus is a small metallic wood-boring beetle in the Buprestidae, tribe Trachyini. are active in early spring and are associated with wild geranium (Geranium maculatum). The is part of a distinctive group of leaf-mining buprestids with flattened, compact body forms adapted for larval development in leaf tissue rather than wood.
Pronunciation
How to pronounce Pachyschelus purpureus: //ˌpækɪˈskɛləs pərˈpʊriəs//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
are small (approximately 3–5 mm), with a flattened, wedge-shaped body characteristic of the tribe Trachyini. The exhibits blue coloration with pubescent spotting, distinguishing it from the black, unspotted Pachyschelus laevigatus and the smaller, unspotted P. nicolayi found in the same region.
Images
Habitat
Occurs in areas supporting wild geranium (Geranium maculatum), including woodland edges and open forests. have been collected on flowers and foliage of this plant.
Distribution
North America. Documented from the eastern United States including Virginia (first state record reported in 2012), Missouri, and Illinois. The nominate P. p. purpureus occurs in the eastern U.S.
Seasonality
Active in early spring. have been collected in late March through May, with peak activity coinciding with flowering of wild geranium.
Host Associations
- Geranium maculatum - larval Wild geranium; confirmed larval . feed on flowers and foliage.
Life Cycle
Larvae are leaf miners, developing within leaf tissue of the plant rather than boring in wood. This represents a derived strategy within Buprestidae.
Behavior
run rapidly on vegetation and have been observed feeding on petals and foliage of plants. Activity is and restricted to the spring flowering period of the host.
Ecological Role
As a , larvae create feeding galleries in plant leaves. levels appear generally low, with limited impact on host plant .
Human Relevance
Of interest to collectors of jewel beetles. First Virginia record was reported from George Washington Memorial Parkway BioBlitz surveys in 2012, demonstrating value of citizen science and park surveys for documenting distributions.
Similar Taxa
- Pachyschelus laevigatusOccurs in Illinois; black coloration without pubescent spotting distinguishes it from blue, spotted P. purpureus. Restricted to Lespedeza as .
- Pachyschelus nicolayiSimilar blue coloration but smaller and lacks pubescent spotting. Active later in season; breeds in Apios americana and Wisteria frutescens.
More Details
Subspecies
Four recognized: P. p. purpureus (Say, 1833) — eastern U.S.; P. p. azureus Waterhouse, 1889; P. p. bicolor Kerremans, 1894; P. p. uvaldei Knull, 1941 — Texas.