Abstract

Sap-sucking insects fail to obtain vitamins, amino acids, and sterols from their plant diet. To compensate, obligate intracellular bacterial symbionts (usually Sulcia and Vidania) provide these missing nutrients. Notably, some planthoppers within the Fulgoromorpha (suborder Auchenorrhyncha) associate with intracellular fungi, which either accompany or replace the anciently associated bacterial partners. Planthopper-symbiont surveys, however, have only been conducted in limited temperate regions, thus necessitating examination of these relationships in the tropics, where insect and fungal diversity is high. Here, five tropical planthopper families host yeast-like endosymbionts related to the parasitic genus Ophiocordyceps. Fungal endosymbiont identity generally corresponded to host family, suggesting possible coevolution. Vertical transmission to offspring was supported by the occurrence of fungal cells in developing eggs. This serves as the most comprehensive tropical planthopper-symbiont survey to date, doubling the roster of known Fulgoromorpha species that host intracellular fungi and further elucidating the remarkable success of this diverse insect group.

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