Philonix fulvicollis

Fitch, 1859

Philonix fulvicollis is a in the , first described by Fitch in 1859. It has an alternation of sexual and , a phenomenon confirmed through molecular analysis of cytb and ITS2 sequences. The species is distributed across eastern and central North America, with records from the United States and Canada. Like other cynipid , it induces formation on plants, though specific host associations require further documentation.

Philonix fulvicollis by (c) Emily Summerbell, some rights reserved (CC BY), uploaded by Emily Summerbell. Used under a CC-BY license.

Philonix fulvicollis by (c) Antoine Guiguet, some rights reserved (CC BY), uploaded by Antoine Guiguet. Used under a CC-BY license.

Philonix nigra gall cut open with larva by Theo Rickert. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Philonix fulvicollis: /fɪˈloʊnɪks ˌfʊlvɪˈkɔlɪs/

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Identification

Philonix fulvicollis can be distinguished from other Philonix by morphological features of the , including details of the mesosoma and metasoma. The alternation of sexual and , confirmed through molecular data showing low sequence divergence (approximately 1.04% in cytb), may aid in identification when both forms are collected from the same locality. Accurate identification typically requires examination of on plants and adult wasp morphology under magnification.

Images

Distribution

Eastern and central North America. United States: New York, Michigan, Tennessee, Illinois, Kansas. Canada: Manitoba, Ontario, Quebec, New Brunswick, Alberta.

Life Cycle

Exhibits alternation of sexual and , with both forms producing females. The sexual generation produces both males and females, while the asexual generation produces only females. This cyclical is characteristic of many and has been confirmed in P. fulvicollis through molecular sequence data.

Ecological Role

As a -forming , induces abnormal growth (galls) on plants. The galls provide shelter and nutrition for developing . The specific ecological impacts on host plant have not been quantified.