A genus of simple sponges found in shallow marine waters, noted for their relatively primitive structure.
Named after the grant or donor of the research collection; the scientific genus name follows Linnaean taxonomy conventions established in the 18th century.
Grantia sponges are so simple they're basically hollow balls with one hole, yet they filter-feed by creating water currents—they're basically nature's most minimal water-cleaning machines and have barely changed in 600 million years.
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