Cosmocomoidea

Howard, 1908

Species Guides

3

Cosmocomoidea is a of fairyflies (Mymaridae) established by Howard in 1908. within this genus are solitary primarily associated with leafhoppers (Cicadellidae: Cicadellinae), which are of plant including Xylella fastidiosa. The genus has been documented from Asia (China, Taiwan, Japan, India), Europe (Denmark, Sweden), and South America, with C. annulicornis being the most extensively studied species due to its potential as a agent.

Cosmocomoidea ashmeadi by no rights reserved, uploaded by Jesse Rorabaugh. Used under a CC0 license.Cosmocomoidea ashmeadi by (c) Victor Engel, some rights reserved (CC BY), uploaded by Victor Engel. Used under a CC-BY license.Cosmocomoidea morrilli by the Smithsonian. Used under a CC0 license.

Pronunciation

How to pronounce Cosmocomoidea: /ˈkɔz.moˌkoɪ.di.a/

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Habitat

have been recorded from organic kiwifruit orchards, organic vineyards, and commercial citrus orchards. The is associated with agricultural and semi-natural environments where leafhoppers occur on diverse plant substrates including citrus, johnsongrass, and grapevines.

Distribution

Recorded from Asia (mainland China: Fujian; Taiwan; Japan: Yamanashi Prefecture, Honshu Island; India), Europe (Denmark, Sweden), and South America. Distribution is likely broader but undersampled due to small size and specialized collecting requirements.

Host Associations

Life Cycle

Solitary development. In C. annulicornis, success and developmental time vary with egg age, with sharply decreasing parasitism in older host eggs and shorter developmental times for hosts 120–144 hours old. Embryogenesis of the host begins approximately 48 hours after oviposition.

Behavior

Females use volatile chemical cues to locate at long range, detecting common plant volatiles such as indole and β-caryophyllene emitted by taxonomically distant host plants after herbivore damage. do not discriminate between fresh and older host eggs based on olfactory cues alone, nor between healthy eggs and those previously parasitized by conspecifics. Final oviposition decisions likely involve more specific contact cues once on the plant.

Ecological Role

agent of leafhoppers, which are of Xylella fastidiosa and other plant causing economically important in citrus, grapevines, and other crops.

Human Relevance

in this , particularly C. annulicornis, have been evaluated for programs targeting of plant in citrus orchards and vineyards.

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