Gasteropod | definition of gasteropod by Medical dictionary
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gastropod any member of the class Gasteropoda in the phylum Mollusca, including MOLLUSCS such as slugs, snails, pteropods, limpets, winkles, whelks and sea slugs. Some forms lack a shell, but where a shell is present it is in the form of a single valve, often spiral. Marine, freshwater and terrestrial forms occur, and there is usually a distinct head, bearing a pair of tentacles and eyes.
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and their use in the assessment of coastal pollution in Skikda (North-east of Algeria).
Echinodermata Astrostole platei Centrostephanus rodgersii Heliaster canopus Holothuria (Mertensiothuria) platei Parvulastra calcarata Polychaeta Polychaeta sp.