Abstract
Baetimyces, belonging to the Legeriomycetaceae, is described here as a new genus. Its single species, B. ancorae, has been found growing in the hindgut of mayfly nymphs of the genus Baetis (Ephemeroptera, Baetidae) inhabiting a Pyrenean Mountains canal-stream from the northeastern region of the Iberian Peninsula. The new genus is characterized by having trichospores with two thick appendages of unequal length, and by zygospores perpendicularly and medially attached to the zygosporophore. The new genus may be related to Glotzia, Legeriomyes, and Zygopolaris, and similarities with these and other genera are compared and discussed. The new species often coexists in the same gut with Legeriomyces ramosus, which is reported for the first time in Spain.
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