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A spectacular group of Venus flower basket glass sponges (Euplectella aspergillum) glass sponges with a squat lobster in the middle. https://commons.wikimedia.org/wiki/File:Euplectella_aspergillum_Okeanos.jpg

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A spectacular group of Venus flower basket glass sponges (Euplectella aspergillum) glass sponges with a squat lobster in the middle. https://commons.wikimedia.org/wiki/File:Euplectella_aspergillum_Okeanos.jpg
https://media.mathstodon.xyz/media_attachments/files/110/526/922/059/450/978/original/c3df63d621b81b00.jpg

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John Carlos Baez (johncarlosbaez@mathstodon.xyz)'s status on Monday, 12-Jun-2023 11:30:31 JST John Carlos Baez
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Here's a colony of Venus' Flower Basket sponges in their natural glory. Glass sponges may be the longest-lived animals on earth, with lifespans of up to 15,000 years.
Details here:
https://wyss.harvard.edu/news/glass-sponges-hold-internal-secrets-to-structural-strength/
https://en.wikipedia.org/wiki/Hexactinellid
and thanks to @dpiponi for telling us about glass sponges!
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