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| animal phylum comprised of sponges |
| phylum comprised of arthropods |
| tergum (ˈtɜːɡəm) | |
| —n , pl -ga | |
| Compare sternum a cuticular plate covering the dorsal surface of a body segment of an arthropod | |
| [C19: from Latin: the back] | |
| 'tergal | |
| —adj | |