Dysidea arenaria is not widely documented in major taxonomic or encyclopedic sources. The name appears to follow the binomial nomenclature conventions used for marine sponges, wherein Dysidea designates a genus of demosponges belonging to the family Dysideidae, and the specific epithet arenaria is derived from the Latin arenarius, meaning “pertaining to sand” or “sandy”.
Given this construction, the term likely refers to a sponge species within the genus Dysidea that is associated with sandy substrates or habitats. However, authoritative references such as peer‑reviewed taxonomic catalogs, major biodiversity databases (e.g., World Register of Marine Species), or encyclopedic entries do not provide a distinct, verifiable description, distribution, or ecological information for Dysidea arenaria. Consequently, the existence and taxonomic status of this species remain uncertain without further specialized literature.