| Protoleucon | |
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| Genus: | Protoleucon |
| Binomial name | |
| Protoleucon pavlovi | |
Protoleucon is an extinct genus of calcareous sponges that belongs to the Leucosolenid family Grantiidae. The genus contains the species Protoleucon pavlovi. It lived in the Moscow region of Russia during the Carboniferous period.