Palaimon Thanks for your informations morlacoral, so this will be a Unknown spotting forever :-) (maybe i found something new ;-) )
moralcoral Its not even as easy as using a microscope, you have to first dissolve the tissue away in nitric acid to extract the spicule, then you identify that under the microscope! very difficult,
Elsa Definitely sponges :) And unfortunately notoriously difficult to ID without a microscope.. Any experts?
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