Stenodynerus oculeus
(Roberts, 1901)
Stenodynerus oculeus is a solitary mason wasp in the Eumeninae. It is a small, cavity-nesting that provisions its nests with paralyzed caterpillars as food for its larvae. The species is difficult to distinguish from closely related such as Parancistrocerus without microscopic examination. Males have been observed foraging on flowers, with the last antennal segment modified into a finger-like structure folded against the adjacent segment.
Pronunciation
How to pronounce Stenodynerus oculeus: /stɛnəʊˈdɪnərəs ɒˈkjuːliəs/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Difficult to distinguish from Parancistrocerus from images of live specimens; microscopic examination often required for definitive identification. Males possess a distinctive last antennal segment that resembles a finger folded up against the adjacent segment. The species is smaller and more ornately patterned than some other mason wasps in the same region.
Habitat
Cavity-nesting that utilizes pre-existing tunnels such as borings in dead wood, hollow twigs, or artificial blocks.
Distribution
North America; specifically recorded in Colorado and Illinois based on available sources.
Diet
Females provision nests with paralyzed caterpillars as larval food.
Behavior
Nests in pre-existing cavities. Females hunt caterpillars, paralyze them, and stock with this prey before laying .
Ecological Role
of caterpillars; contributes to natural pest control in where it occurs.
Human Relevance
Occasionally occupies artificial blocks or bee hotels, where it may be observed by naturalists.
Similar Taxa
- ParancistrocerusExtremely similar appearance; live specimens and even many images cannot reliably separate the two without microscopic examination.
- EuodynerusShares cavity-nesting habit and general mason wasp , but typically differs in size and pattern details.