Order Astrophorida | Class Demospongiae Phylum Porifera Rank Species | |
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Similar Polymastia boletiformis, Hemimycale columella, Axinella dissimilis, Cliona celata, Polymastia |
Pachymatisma johnstonia
Pachymatisma johnstonia is a species of demosponge belonging to the family Geodiidae. A species of north east Atlantic coasts, this is a usually grey encrusting sponge with large prominent oscula and a pale yellow interior. The size and form depends largely on the extent of its exposure to waves. In heavily wave-exposed locations, it is usually small and thin but in more sheltered places can grow to over 50 cm across and 15 cm thick.
References
Pachymatisma johnstonia Wikipedia(Text) CC BY-SA