Phanacis hypochoeridis

(Kieffer, 1887)

Catsear Gall Wasp

Phanacis hypochoeridis is a gall wasp in the Cynipidae. It induces galls on plants in the Asteraceae family, specifically on catsear (Hypochaeris radicata) and related . The species is native to Europe and has been introduced to other regions including Oceania. As a gall-former, it manipulates plant tissue to create a protective structure for its developing larvae.

Phanacis hypochoeridis by (c) Stephen Thorpe, some rights reserved (CC BY), uploaded by Stephen Thorpe. Used under a CC-BY license.

Phanacis hypochoeridis by Stephen Thorpe. Used under a CC BY 4.0 license.

Phanacis hypochoeridis 76037428 by Garth Harwood. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Phanacis hypochoeridis: /fəˈnæsɪs haɪpoʊˈkɛrɪdɪs/

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

Identification

Identification requires examination of the galls formed on plants. Galls appear on stems or leaves of Hypochaeris . are small, typically 2-4 mm in length, with reduced wing venation characteristic of Cynipidae. Accurate identification to species level usually requires examination of morphological features or gall characteristics.

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Habitat

Found in supporting its plants, including grasslands, meadows, roadsides, and disturbed areas where Hypochaeris radicata and related Asteraceae occur.

Distribution

Native to Europe and northern Asia. Introduced to Oceania including New Zealand and Australia. GBIF records indicate presence in Europe, northern Asia (excluding China), and Oceania.

Host Associations

Hypochaeris radicata - Primary ; gall formation occurs on stems and leaves
Hypochaeris glabra - Secondary

Life Cycle

Females oviposit into plant tissue, inducing gall formation. Larvae develop within the gall, feeding on plant tissue. Development occurs entirely within the gall structure. timing varies by region; typically spring to summer in temperate zones. details for specific are incompletely documented.

Ecological Role

As a gall-former, modifies plant growth patterns and creates microhabitats used by other organisms. Galls may serve as food sources or shelter for and . Contributes to plant-herbivore dynamics in grassland .

Human Relevance

Minor economic significance. May be encountered in agricultural or horticultural settings where plants occur. Occasionally studied as a agent for Hypochaeris in regions where these plants are weeds.

Similar Taxa

Phanacis centaureaeAlso in Phanacis; induces galls on Centaurea rather than Hypochaeris
Aulacidea hieraciiAnother cynipid gall wasp on Asteraceae; plant association differs (Hieracium vs. Hypochaeris)
Uroleucon hypochoeridis with similar association (Hypochaeris) but different order (Hemiptera); not a gall-former

More Details

Taxonomic History

Originally described as Aulax hypochoeridis by Kieffer in 1887, later transferred to Phanacis. The genus Phanacis currently contains approximately 20 , primarily gall-formers on Asteraceae.

Gall Morphology

Galls are typically spindle-shaped or irregular swellings on stems, or less commonly on leaf midribs. Gall color ranges from green to purplish when young, becoming brown with age. Size varies but generally 10-30 mm in length.