| 1 | Only scales present in coenenchyme | 2 |
| – | Rods present in coenenchyme | 3 |
| 2 | Rods and spindles present in polyp body wall | M. tenuis |
| – | Rods and scales present in polyp body wall | M. melanotrichos |
| 3 | Plates present in tentacles and only rods in coenenchyme | M. splendens |
| – | Plates absent in tentacles, rods and scales present in coenenchyme | M. macrospina |
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