A subclass of extinct or fossil sea urchins (echinoderms) characterized by particular structural features of their water-conducting systems.
From hadrom (water-conducting system) + Greek -ine (belonging to) + -a (scientific naming). It's a taxonomic classification combining plant and echinoderm terminology.
Hadromerina is a wonderful example of how scientists borrow plant terminology to classify sea creatures—showing that life's solutions often repeat themselves across completely different organisms.
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