Spilomyia crandalli
Curran, 1951
Crandall's Hornet Fly
Spilomyia crandalli is a rare of described by Curran in 1951. are known as and are commonly found on flowers, where they feed on nectar and pollen. The species belongs to a renowned for exceptional , including visual, behavioral, and acoustic deception of yellowjackets. are adapted to moist environments such as tree rot holes.
Pronunciation
How to pronounce Spilomyia crandalli: /ˌspaɪloʊˈmaɪ.ə krænˈdælaɪ/
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Identification
Distinguished from actual yellowjackets (Vespula, Dolichovespula) by short with versus long, thick antennae; single pair of versus two pairs; and large meeting at top of . Distinguished from other Spilomyia by geographic range and specific pattern details requiring expert examination. Members of Spilomyia wave their legs to simulate wasp antennae, a behavioral cue useful for field identification.
Habitat
frequent flowers in various settings. inhabit moist microhabitats, specifically water-filled rot holes in trees.
Distribution
Documented from Arizona and New Mexico in the United States, and from Mexico. Described as occurring in western North America near the Pacific coast, though specific collection records are sparse.
Diet
feed on nectar and pollen from flowers. Larval diet consists of decaying matter in moist tree holes.
Life Cycle
are described as 'short-tailed larvae' adapted for moist environments such as rot holes in trees. with , larval, pupal, and stages; specific developmental details are not documented.
Behavior
hover in with wingbeat frequency nearly identical to that of yellowjacket , contributing to acoustic . When at rest, individuals may wave their legs in front of the to simulate the longer of wasps. The combination of visual, behavioral, and acoustic mimicry creates a multilayered defensive deception.
Ecological Role
function as when visiting flowers. serve as and nutrient cyclers in tree rot hole microhabitats.
Human Relevance
Contributes to in natural and potentially agricultural systems. The ' rarity and limited distribution may make it of interest for .
Similar Taxa
- Spilomyia longicornisAnother North Spilomyia with similar -mimicking appearance; distinguished by distribution and subtle morphological differences
- Vespula pensylvanica (Western Yellowjacket)Primary model for ; distinguished by two pairs of , long thick , and different structure
- Dolichovespula arenaria (Aerial Yellowjacket)Another model for ; distinguished by , structure, and smaller that do not meet dorsally
More Details
Taxonomic history
Described by Charles Howard Curran in 1951. The specific epithet honors an individual with the surname Crandall.
Mimicry sophistication
The Spilomyia is considered among the most accomplished mimics in the world, employing visual (color pattern, markings, darkening), behavioral (-waving), and acoustic (wingbeat frequency) components of deception.