Pachymatisma johnstonia is a species of sponge belonging to the family Geodiidae. A species of the north-eastern 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.
| Pachymatisma johnstonia | |
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Porifera |
| Class: | Demospongiae |
| Order: | Tetractinellida |
| Family: | Geodiidae |
| Genus: | Pachymatisma |
| Species: | P. johnstonia
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| Binomial name | |
| Pachymatisma johnstonia | |
| Synonyms | |
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References
edit- Pachymatisma johnstonia at World Register of Marine Species
- Barratt, John H.; Yonge, C. M. (1958). Collins Pocket Guide to the Sea Shore. William Collins, Sons. p. 43.
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