Anthrax argyropygus

Wiedemann, 1828

Anthrax argyropygus is a in the , characterized by its lifestyle. The Anthrax contains species known to attack the of ground-nesting , including and solitary . are typically observed visiting flowers for nectar, where their hairy bodies inadvertently collect and transfer pollen. The species name 'argyropygus' refers to the silvery appearance of the . Like other bee flies, this species exhibits of bees, possessing a single pair of and a long adapted for nectar feeding.

Anthrax argyropygus by (c) Katja Schulz, some rights reserved (CC BY). Used under a CC-BY license.

Anthrax argyropygus (50051486183) by Christina Butler from Georgia, United States. Used under a CC BY 2.0 license.

Beefly - Flickr - treegrow (3) by Katja Schulz from Washington, D. C., USA. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Anthrax argyropygus: /ˈænθræks ˌɑrɡɪrəˈpaɪɡəs/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from other Anthrax by the silvery or argent coloration of the (the 'argyropygus' or silver-rumped characteristic). patterns, particularly the location of the r-m , may be used to distinguish Anthrax from related such as Systoechus. are active in spring, which may help separate from fall-active species in other genera. Final identification typically requires examination of or expert confirmation.

Images

Habitat

frequent meadows and open areas with abundant flowering plants. Larval is dependent on availability, typically associated with ground-nesting in sandy or well-drained soils.

Distribution

Distribution records are limited in the provided sources. The has been documented in North America based on iNaturalist observations (626 records), but specific range boundaries are not detailed in available literature.

Seasonality

are active in spring. This seasonal pattern distinguishes Anthrax from some related such as Systoechus, which tend to be active in fall.

Diet

feed on nectar from flowers using their elongated . are ; specific for A. argyropygus are not documented in the provided sources, but attack larvae of () and solitary (, , ).

Life Cycle

with , larval, pupal, and stages. Females eggs near or in burrows. attach externally to host larvae and feed as , eventually killing the host. Specific details for A. argyropygus are not documented; the is inferred from congeneric .

Behavior

are rapid, agile fliers often mistaken for due to their hairy appearance and hovering near flowers. They perform pre-flight warm-up by rapidly fluttering . Females exhibit -following , tracking solitary bees back to their nests to .

Ecological Role

function as through incidental pollen transfer on their hairy bodies while feeding on nectar. act as , potentially regulating of ground-nesting . The contributes to complexity in meadow and grassland .

Human Relevance

provide services. No direct economic impact is documented; the is not known to be a pest. The -mimicking appearance may cause temporary confusion with stinging , but are harmless to humans.

Similar Taxa

Bombylius majorAlso a with long and -mimicking appearance, but lacks the silvery abdominal coloration of A. argyropygus and is generally larger.
Systoechus spp.Similar distinguished by (position of r-m ) and typically fall-active rather than spring-active.
Anthrax georgicus with similar lifestyle on , but differs in abdominal coloration and specific associations.

Misconceptions

Frequently mistaken for due to hairy appearance and flower-visiting ; the single pair of and lack of a constricted waist distinguish from true .

More Details

Etymology

The specific epithet 'argyropygus' derives from Greek 'argyros' (silver) and 'pyge' (rump or ), referring to the distinctive silvery coloration of the .

Taxonomic note

The Anthrax has undergone taxonomic revisions; some sources may list synonyms or related names. The was described by Wiedemann in 1828.