Bluebelly Coralblenny
Ecsenius caeruliventris
- Least concern
- Card rarity: Common
- Fish

Ecsenius caeruliventris, known commonly as the bluebelly blenny in Indonesia, is a species of combtooth blenny in the genus Ecsenius. It is a tropical blenny found in the western Pacific ocean, specifically in Sulawesi, Indonesia. Male Ecsenius caeruliventris can reach a maximum length of 2.4 centimetres, while females can reach a maximum length of 2.37 centimetres; it is one of the smallest blennies in Ecsenius. The species name means "sky-blue belly" from the Latin words caeruleus and ventris, referring to the blue abdomen on the species; the common name is derived from this. The species is most similar to its sister taxon E. shirleyae and E. bandanus.
Classification
- Class
- Actinopterygii
- Order
- Blenniiformes
- Family
- Blenniidae
- Genus
- Ecsenius