[1] Recent research indicates that Trogoderma is polyphyletic, comprising two distinct, unrelated lineages.

The other lineage, formerly considered part of Trogoderma, represents a distinct Southern Hemisphere clade, reclassified under the previously synonymized genus Eurhopalus.

However, in 2013, researchers reclassified the species of the genus, placing them under the subgenus Nathrenus within Anthrenus.

[3] This taxonomic change did not take into account the considerable morphological differences between the adults and larvae of Neoanthrenus species and those of Anthrenus, and later authors recognize significant distinctions between these groups.

[1] Further phylogenetic studies in 2006, along with molecular analyses in 2022, support the distinction between these two genera, and place Neoanthrenus as a synonym of Eurhopalus rather than Anthrenus.