Suborder-Animalia: Scorpaenoidei

Scorpaenoidei is one of the suborders of the scorpaeniformes. This suborder is usually found in the benthic zone, which is the lowest region of any water body such as oceans or lakes. There are two groups of the scorpaenoidei. The sea robins is the first, which are further classified into two families: the sea robins and the armored sea robins. One significant difference between the two families of sea robins is the presence of spine-bearing plate on the armored sea robins which is absent in the sea robins family. The second group of the scorpaenoidei suborder is the scorpionfishes, which according to Minouri Ishida's work in 1994 and recent studies, have twelve families. The scorpionfishes are very dynamic in size with the smallest one having a range of 2-3 cm, while the largest have a length of approximately 100cm.

Reference: Wikipedia