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Saltwater. Spider Crabs. The largest spider crab in the region.

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Saltwater. Zoanthids. This colonial zoanthid is symbiotic and grows in band-like rows, often winding around the branches of the host sponge.

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Mariene spons. Vormt plakkaten of korsten met kleine, grijsbruine of paarsachtige schoorsteenvormige buisjes. Deze zijn dunwandig, tot 2-3 cm hoog, met een doorsnede van 0,5 cm. De hele spons voelt zacht aan, maar het oppervlak is ruw. De spons is fragiel. Oosterschelde: zeldzaam, mogelijk inmiddels verdwenen.

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Bicolored sponge. Usually purple with yellow (especialy inside). But also orange or grey forms occur. The sponge usually forms several long tubes which are rounded at the top. Surface knobbed in a regular pattern. More rare is the spherical yellow morph.

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