Chaetostomella

Hendel, 1927

Chaetostomella is a of in the , established by Hendel in 1927. The genus comprises approximately 16 described distributed across the Palearctic region. At least one species, Chaetostomella cylindrica, exhibits race formation on different thistle species, with documented genetic, morphological, and behavioral divergence between associated with Notobasis syriaca and Onopordum illyricum.

Pronunciation

How to pronounce Chaetostomella: /ˌkiːtəstəʊˈmɛlə/

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Habitat

Flower of thistles (Asteraceae); specific associations documented for C. cylindrica in Lebanon where plants occur in sympatry

Distribution

Palearctic region; confirmed records from Denmark, Norway, Sweden; C. cylindrica documented in Lebanon

Diet

feed on achenes within thistle flower ; C. cylindrica larvae destroy 3–10 achenes each

Host Associations

  • Notobasis syriaca - race of C. cylindrica
  • Onopordum illyricum - race of C. cylindrica
  • Asteraceae (six genera and ten species of thistles) - C. cylindrica documented on multiple thistle

Life Cycle

Larval development occurs within thistle flower ; stages feed internally on developing achenes

Behavior

differs between races of C. cylindrica: females associated with Onopordum lay ~3 per in glued clusters, while Notobasis-associated females eggs unattached, usually one egg per head; subtle differences observed in post-mating male behavior between host races

Ecological Role

of thistle seeds; potential candidate for of weedy thistle

Human Relevance

Studied as a model for race formation and incipient speciation; potential agent for thistles

Similar Taxa

  • Other Tephritidae genera infesting Asteraceae flower headsSimilar ; Chaetostomella distinguished by -level morphological characters and specific associations where documented

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