pseudonymidae

Pseudonymidae is a proposed family of the order Decapoda, within the infraorder Brachyura, commonly known as crabs. This family was suggested to encompass several genera that were previously assigned to other families, notably the Xanthidae and Pilumnidae. The rationale behind the creation of Pseudonymidae often stemmed from new phylogenetic analyses based on molecular data, which indicated a distinct evolutionary lineage for these particular crabs. However, the recognition and formal establishment of Pseudonymidae as a valid family have been subject to ongoing debate and research within the carcinological community.

The genera typically considered for inclusion in Pseudonymidae exhibit a range of morphological characteristics, though they are often defined by a combination of features related to their carapace shape, chelipeds, and gonopods. These crabs are found in various marine environments across the globe, inhabiting diverse habitats such as coral reefs, rocky shores, and soft-sediment bottoms. Species within this proposed family may display significant variation in size, color, and ecological roles.

Due to the tentative nature of its establishment, the taxonomic status of Pseudonymidae remains a subject of active investigation. Further research, including comprehensive morphological and genetic studies, is necessary to definitively establish its validity and delineate the precise composition of the family. Until further consensus is reached by experts, some classifications may continue to place these genera within their previously assigned families.