Antistrophus
undescribed Silphium flower gall wasp
An undescribed of in the Antistrophus that induces flower on Silphium species, particularly in tallgrass prairie . The manipulates tissue to form protective galls that house developing . This species represents part of a complex of Antistrophus wasps specialized on Silphium plants, with distinct species targeting stems versus flowers.
Pronunciation
How to pronounce Antistrophus: /ænˈtɪs.trə.fəs ˌʌn.dɪˈskraɪbd ˈsɪlf.i.əm ˈflaʊ.ər ˌɡɔlz/
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Identification
Distinguished from other Antistrophus by location: this undescribed species induces galls on Silphium flowers, whereas A. silphii and A. lygodesmiaepisum form stem galls on Silphium integrifolium and Silphium terebinthinaceum respectively. The flower- habit is unique among described Antistrophus species on Silphium. Formal species description pending.
Appearance
are small, typical of , with reduced characteristic of the . The induced form on Silphium flower , distinct from the stem galls produced by congeneric . Gall specific to this flower- form has not been formally described in published literature.
Habitat
Tallgrass prairie where Silphium plants occur. Associated with prairie remnants and restored prairie in the central United States.
Distribution
Documented from tallgrass prairie regions, particularly Illinois and adjacent states where intensive study of Silphium has occurred. Specific range boundaries undefined pending formal description.
Seasonality
and timed to Silphium flowering ; precise seasonal timing undocumented for this specific flower- form but likely mid-summer based on related biology.
Host Associations
- Silphium integrifolium - wholeleaf rosinweed; flower
- Silphium terebinthinaceum - prairie dock; flower
Life Cycle
Females oviposit into developing Silphium flower , inducing formation. develop within the gall, feeding on nutritive tissue. occurs within the gall; emerge through exit holes. Specific developmental timing and undocumented.
Behavior
represents sophisticated manipulation via chemical cues in fluids or larval secretions that redirect plant development. The flower- habit suggests precise targeting of floral meristematic tissue distinct from the stem-targeting of congeneric .
Ecological Role
Creates novel structures that may serve as microhabitats for secondary occupants ( and ). Contributes to prairie through plant- specialization. Part of complex trophic web involving Silphium, , and associated parasitoid .
Human Relevance
Subject of ecological research on mechanisms and prairie . Undescribed status highlights ongoing discovery of insect diversity even in relatively well-studied North .
Similar Taxa
- Antistrophus silphiiAlso uses Silphium integrifolium, but induces stem rather than flower galls; distinct gall location and
- Antistrophus lygodesmiaepisumInduces stem on Silphium terebinthinaceum; distinguished by gall position and tissue specificity
More Details
Taxonomic Status
This has been referenced in ecological literature as an undescribed Antistrophus species specialized on Silphium flowers, distinct from the described stem- species. Formal taxonomic description has not been published.
Research Context
Discovered during doctoral research on Silphium at the University of Illinois, alongside the described A. meganae (named for researcher's partner). This flower- form represents a third -specific lineage within the on Silphium.