Stomatosematidi are by far the smallest of the four supertribes of Cecidomyiinae (Diptera: Cecidomyiidae) containing 56 species. The life history of only one species has been known previously: adults of Stomatosema nemorum Kieffer were reared from larvae feeding on a mushroom, Lactarius sp. (Fungi: Russulaceae). Here we describe the larva and adults of a new species, Stomatosema gagnei Kolesik, that was found inducing pustulate leaf galls on Causonis trifolia (Vitaceae) plants in Cape York Peninsula, Australia. Stomatosema gagnei is the first Stomatosematidi with a described larva and the first known to cause a gall. The fact that a species of Stomatosematidi, a supertribe hypothesized to be the sister group to all remaining Cecidomyiinae, was found inducing a plant gall suggests that the first of the transitions from the ancestral fungus-feeding habit to plant-feeding occurred in Cecidomyiidae at the base of the Cecidomyiinae clade more than 100–110 million years ago, during the lower Cretaceous.
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8 December 2022
A New Stomatosema from the Australian Tropics - The First Species of Stomatosematidi (Diptera: Cecidomyiidae) Known to Cause a Plant Gall
Peter Kolesik,
Luke A. Halling
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bush grape
Cayratia trifolia (L.) Domin
fox grape
gall midge
insect taxonomy
three-leaved wild vine
transition to herbivory