Eurotiomycetes, class of fungi in the phylum Ascomycota (sac fungi) within the kingdom Fungi. The members of Eurotiomycetes produce saclike structures (asci) containing ascospores in either a closed fruiting body (ascocarp) or spore balls. Example genera are Capronia (order Chaetothyriales), which includes some marine fungi, Pyrenula (order Pyrenulales), which includes wart lichens, and Eurotium (order Eurotiales), which includes species of Aspergillus for which a sexual phase of reproduction has been identified.