Ventral sucker of Lumbsucker
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Scorpaeniformes
Family: Cyclopteridae
Description
The ventral sucker of tlumbsucker is an adhesive disc that are located ventrally, behind the pectoral fins. These ventral suker is pelvic fins that are modified to form a clinging disc with a thickened margin on the ventral surface of the body. The fish use these discs to adhere to the substrate.
Reference:
https://blogs.scientificamerican.com/running-ponies/lumpsucker-fish-just-when-you-thought-the-ocean-couldne28099t-get-more-lumpy-and-adhesive/
http://www.fishbase.org/summary/4177