What is "gobioidei"

The Gobioidei are a suborder of the Perciformes, the largest order of fish. The suborder includes the gobies. The suborder Gobioidei is made up of 2,211 species which are divided into seven different families. Phylogenetic relationships of the Gobioidei have been elucidated using molecular data. Gobioids are generally small fish and are mostly marine (saltwater) fishes, but roughly 10% of the population inhabit fresh waters. This suborder is made up of mainly benthic or sand-burrowing fish. Benthic fish live on the bottom of a body of water. Like in most benthic organisms, gobioids do not have a gas bladder or swim bladder which keeps them from suspending in the water column, so they must stay on the bottom.