Paratropical subsea

A Paratropical subsea is a high-latitude body of water within a paratropical province and one in which the temperature regularly falls below , but not below which is considered sub-tropical. Paratropical subseas are distributed equally polewards of eutropical subseas. 
Paratropical subseas are absent of corals and well-developed carbonate beds and seagrass, yet contain a mixture of Tethys Ocean lineages of the Eocene as well as Boreal and anti-Boreal (Southern Hemisphere) taxa. This marine environment supports a single species of a few mollusks found in eutropical subseas. Brittle stars, "Turridae", "Cassis", "Euspira", and the rock snails "Muricidae" thrive in paratropical subseas.