Pachymatisma johnstonia

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Pachymatisma johnstonia
Pachymatisma johnstonia.jpg
Scientific classification Red Pencil Icon.png
Domain: Eukaryota
Kingdom: Animalia
Phylum: Porifera
Class: Demospongiae
Order: Tetractinellida
Family: Geodiidae
Genus: Pachymatisma
Species:
P. johnstonia
Binomial name
Pachymatisma johnstonia
Synonyms
  • Caminus osculosusGrübe, 1872
  • Halichondria johnstoniaBowerbank in Johnston, 1842

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.

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