[1] The family Ommatidae is considered a subfamily of Cupedidae by some authors, but ommatids have been found to more closely related to Micromalthidae in genomic analysis studies.

[2] These beetles tend to be elongated with a parallel-sided body, ranging in length from 10 to 20 mm (0.39 to 0.79 in), with colors brownish, blackish, or gray.

[1] The larvae eat the fungus-infested dead wood or tree roots while the adults are believed to subsist on pollen and plant sap.

[3] Males of Priacma serrata (western North America) are notable for being strongly attracted to common household bleach.

[4] Notocupes, traditionally considered a member of Ommatidae, has been suggested to be more closely related to Cupedidae via cladistic analysis.