Mollusca or Molluscs , are one of the most diverse phylums with almost 100,000 living species, most familiar with invertebrates and are usually marine. 80% of Mollusca are snails and slugs.
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Ariolimax Columbianus, aka large slug or banana slug (due to there yellowish color) are air breathing land slugs. The banana slug excretes a very much diluted primary urine, some slugs are able to resorb the water out of there urine.
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Calyptogena Magnifica aka Giant white clam, are found at the hydrothermal vents at the abyssal depths of the Pacific ocean. The Giant white clam excretes by washing out nitrogenous wastes in form of toxic but highly soluble ammonia.
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Hapalochlaena Maculosa aka blue ringed octopus, has eight arms with suckers and developed eyes. The pattern of the stomach varies according to the mollusks diet. The waste product is replaced in the bloodstream with salt and other substances. The waste is then removed.