Asteromyia carbonifera

(Osten Sacken, 1862)

Carbonifera goldenrod gall midge

Asteromyia carbonifera is a that forms an obligate mutualistic relationship with the Botryosphaeria dothidea. Females carry fungal in specialized mycangia on the and them alongside on Solidago plants. The fungus induces formation, and feed on fungal tissue within the gall. This -fungus is essential for successful development; neither partner can complete its independently under natural conditions.

Asteromyia carbonifera by (c) Bea Leiderman, some rights reserved (CC BY), uploaded by Bea Leiderman. Used under a CC-BY license.

Asteromyia carbonifera larva by Beatriz Moisset. Used under a CC BY-SA 4.0 license.

Asteromyia carbonifera gall by Beatriz Moisset. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Asteromyia carbonifera: /ˌæstɛroʊˈmaɪə ˌkɑːrbəˈnɪfərə/

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

Identification

possess specialized mycangia—pocket-like structures on the for storing fungal . are small, delicate typical of . on Solidago stems or leaves contain blackened, carbon-like fungal tissue, distinguishing them from other gall-forming on goldenrod. The association with Botryosphaeria dothidea is diagnostic for this .

Images

Habitat

Associated with Solidago (goldenrod) plants in open fields, meadows, and disturbed where goldenrod grows.

Distribution

Recorded from Vermont and elsewhere in the United States. GBIF distribution records indicate presence in the US, with iNaturalist observations suggesting a broader North range.

Diet

feed primarily on the mycelium of Botryosphaeria dothidea, the symbiotic that forms the structure. This represents a mycophagous diet within the context of an obligate .

Host Associations

Solidago altissima - Primary for ; other Solidago may be used
Botryosphaeria dothidea - obligate mutualistic forms structure; feed on fungal tissue and transport in mycangia
Torymus capite - whose attack is inhibited by the fungal

Life Cycle

Females lay up to 300 per event, depositing fungal from mycangia alongside eggs. develop within the -induced , feeding on Botryosphaeria dothidea mycelia. occurs within the gall. are short-lived and produce a single batch of during pupal development, then engage in multiple oviposition events.

Behavior

Females actively collect and transport fungal in specialized mycangia on the , then inoculate tissue during -laying. Clutch size varies based on maternal mortality risk: females facing higher mortality risk between events larger clutches to maximize through moderately fecund offspring rather than few highly fecund individuals.

Ecological Role

Induces formation on Solidago through fungal , manipulating tissue development. The fungal provides physical defense against attack by Torymus capite. Represents a rare example of obligate - mutualism in gall-forming insects.

Similar Taxa

Other Asteromyia speciesCongeneric may form similar associations with or induce comparable on Asteraceae; differentiation requires examination of fungal identity and gall
Other Cecidomyiidae on SolidagoMultiple inhabit goldenrod; A. carbonifera is distinguished by the black, carbon-like fungal tissue and documented association with Botryosphaeria dothidea

More Details

Evolutionary significance

A. carbonifera represents an incipient adaptive radiation with genetically differentiated diverging in on Solidago altissima, potentially driven by pressure. This system provides a model for studying the evolution of obligate and their role in diversification.

Mycangia structure

The presence of mycangia on the for fungal transport is a specialized morphological that facilitates the of the fungal and ensures successful .