Oligobranchs

Oligobranchs are a group of teleost fish belonging to the order Perciformes. The name "oligobranch" translates to "few gills" and refers to a characteristic reduction in the number of gill filaments. This is a distinguishing feature of this group, which includes a variety of marine and freshwater species. Oligobranchs are found in diverse habitats across the globe, from coral reefs to freshwater rivers. They exhibit a wide range of body shapes and sizes, reflecting their varied ecological niches.

The taxonomic classification of oligobranchs is complex and has been subject to revision. Historically, they were grouped together based on their reduced gill structure. More recent phylogenetic studies have placed them within the larger order Perciformes. Some well-known families often associated with oligobranchs include the gobies (Gobiidae), blennies (Blenniidae), and damselfishes (Pomacentridae), though the precise definition and composition of the oligobranch clade can vary depending on the classification system used. Their ecological roles are equally diverse, with many species acting as important components of their respective food webs, either as predators or prey.