The plural or taxonomic class name for calcareous sponges, representing the group of sponges with calcium carbonate skeletons.
Latin plural form of 'calcispongia,' the scientific classification combining 'calx' (lime) and 'spongia' (sponge). Used in formal biological taxonomy since the 1800s.
This is one of the oldest animal groups still alive today—calcispongiae have been filtering ocean water for over half a billion years without much change to their basic design!
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