Subhemiptera

Subhemiptera is an obsolete taxonomic classification that was once used to group certain orders of insects within the broader category of Hemiptera. The term was introduced in the early 20th century as a way to distinguish between "true bugs" and other related groups based on morphological and behavioral differences. However, modern taxonomic revisions have largely abandoned this classification due to advancements in phylogenetic research, which have shown that the groups previously placed under Subhemiptera are not closely related to one another.

The Subhemiptera was traditionally composed of three main orders: Hemiptera sensu stricto (the "true bugs"), Thysanoptera (thrips), and Psocodea (which includes lice and booklice). These orders were grouped together based on shared characteristics such as piercing-sucking mouthparts and hemimetabolous development (incomplete metamorphosis). However, genetic and developmental studies have revealed that these groups are not monophyletic, meaning they do not share a single common ancestor to the exclusion of other groups.

Today, Thysanoptera and Psocodea are generally considered separate classes or suborders within their own distinct lineages, while Hemiptera sensu stricto remains a well-defined order. The reclassification reflects a more accurate understanding of evolutionary relationships, emphasizing phylogenetic accuracy over traditional morphological groupings. As a result, the term Subhemiptera is no longer used in formal taxonomic classifications, and its historical significance lies primarily in the early efforts to organize insect diversity. Modern entomology relies on cladistic analysis to determine evolutionary relationships, ensuring more precise and scientifically grounded classifications.