Holcobius simplex is not a widely recognized term in mainstream encyclopedic sources. The name appears to follow the binomial nomenclature format used in biological taxonomy, suggesting it could refer to a species—most plausibly a beetle or other insect—within a genus named Holcobius. The species epithet simplex is Latin for “simple” or “uncomplicated,” a descriptor occasionally applied in scientific naming.
No reliable, detailed information about the morphology, distribution, ecology, or taxonomic history of Holcobius simplex is available in major reference works. Consequently, any further description would be speculative. The term may appear in specialized taxonomic catalogs or older scientific literature, but without corroborating sources its exact nature remains uncertain.