Fungal-mutualism
Guides
Asteromyia
Asteromyia is a genus of gall midges comprising approximately nine described species. Members of this genus induce distinct gall morphologies on host plants in the Asteraceae family, particularly Solidago (goldenrod) species. The genus is notable for complex ecological interactions, including obligate mutualisms with symbiotic fungi that form protective gall structures and mediate defense against parasitoids. Some species complexes exhibit incipient adaptive radiation with sympatric sibling species producing phenotypically distinct galls on the same host plant.
Asteromyia tumifica
Asteromyia tumifica is a gall midge in the family Cecidomyiidae that induces blister galls on goldenrod stems. The species maintains a distinctive symbiotic relationship with fungi, which are transported by females in the ovipositor and transferred during egg-laying. These fungi form a black, hardened protective cast around mature larvae within the gall.
Euwallacea validus
Valid Bark Beetle
Euwallacea validus is an ambrosia beetle native to Asia, first detected in North America in Long Island, New York in 1975. It is the most widespread and longest-established Euwallacea species in the United States, having spread throughout the eastern U.S. and into Canada. The beetle maintains a mutualistic symbiotic relationship with two fungal associates: Fusarium oligoseptatum (AF-4) and Raffaelea subfusca, which it cultivates in galleries bored into host trees. Unlike some related invasive ambrosia beetles, its fungal symbionts do not appear to be virulent pathogens to known hosts.
Phorbia
Wheat bulb fly, Black fly, Onion fly
Phorbia is a genus of true flies in the family Anthomyiidae. Several species are significant agricultural pests, including Phorbia coarctata (Wheat Bulb Fly) on cereals, Phorbia securis (Black Fly) on wheat, and Phorbia cepetorum (Imported Onion Fly) on Allium crops. Some species engage in unusual mutualistic interactions with Epichloe fungi, transporting spermatia between fungal individuals in a manner analogous to insect pollination of angiosperms. The genus occurs in Europe and North America.
Pityophthorina
Pityophthorina is a subtribe of ambrosia beetles within the tribe Xyleborini (subfamily Scolytinae, family Curculionidae). These beetles are characterized by their obligate mutualisms with ambrosia fungi, which they cultivate in wood galleries. The subtribe includes genera such as Pityophthorus, which are predominantly associated with coniferous hosts. Members are small, cylindrical bark beetles with reduced elytral declivity and specialized mycangia for transporting fungal spores.
Urocerus
horntail, woodwasp
Urocerus is a genus of horntails (woodwasps) in the family Siricidae containing approximately seven to eight described species. These large, non-venomous wasps are characterized by their elongated, cylindrical bodies and prominent cornus (horn-like spine) at the tip of the abdomen. Females possess a long, drill-like ovipositor used to insert eggs into dead, dying, or weakened trees. Species in this genus are obligate mutualists with wood-decaying fungi, which they vector and cultivate for larval nutrition. Several species have broad distributions across the Northern Hemisphere, with some introduced outside their native ranges.
Urocerus californicus
California Horntail
Urocerus californicus, commonly known as the California Horntail, is a large wood-boring wasp in the family Siricidae. Adults are striking insects with elongated, cigar-shaped bodies and prominent ovipositors in females. Despite their intimidating appearance, they are non-venomous and do not sting. The species is native to western North America, with records from Oregon, California, and British Columbia. Like other horntails, females bore into dead or dying hardwood trees to deposit eggs, introducing symbiotic fungi that help break down wood for larval consumption.
Xyleborus volvulus
Xyleborus volvulus is a bark beetle in the family Curculionidae. It is native to tropical and subtropical regions and has been documented in North America, the Caribbean, Middle America, and Africa. The species is an ambrosia beetle that cultivates symbiotic fungi in tunnels bored into wood. It has been observed to carry Raffaelea lauricola, the pathogen causing laurel wilt disease, which has altered its status from a wood degrader to a potential pest of avocado and other lauraceous trees.
Xyloterini
Xyloterini is a tribe of ambrosia beetles within the subfamily Scolytinae (Curculionidae). Members are characterized by fungal cultivation behavior and association with woody host plants. The tribe includes genera such as Xyloterinus and Indocryphalus. Xyloterinus politus, the type species of Xyloterinus, attacks black oak trees and maintains mutualistic relationships with ambrosia yeasts including Candida xyloterini, a yeast species named after this beetle tribe.