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 ![]() | |
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.