Gastropoda: The class Gastropoda contains a vast total of named species, second only to the Insects in overall number.


A Medusa (biology) is an umbrella-shaped Cnidarian



Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Order Decapoda, Infraorder Brachyura (βραχύς= short, οὐρά= tail), Section Eubrachyura


Mollusca

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a marine opisthobranch gastropod Mollusca. Opisthobranch means "gills behind" (and to the right of the heart). In contrast, Prosobranch means gills in front (of the heart). Opisthobranchs are characterized by two pairs of tentacles and a single gill behind and to the right of the heart. Heterobranchia=Euthyneura (q.v)



Fish

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Class Chondrichthyes (χονδρ=cartilage, ἰχθύς=fish), subclass Elasmobranchii (comprises Selachii (sharks) and Batoidea (rays, skates))

The largest recorded specimen was more than 7.6 metres (25 ft) across, and weighed about 2,400 kilograms (5,300 lb).


Marine