Overview

Comprehensive Description

Description

 A large rounded sponge up to 15 cm in diameter and height up to 10 cm. The consistency is firm-hard, but slightly compressible. The smooth surface is bluish or violet-grey and extensively perforated with inhalant orifices. Larger exhalant openings (osculum) are distinct and usually in lines or arranged in clusters. The skin (cortex) is distinct and 1 mm thick, underneath the surface the colour is yellow-white.
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Description

This sponge may be massive-lobose, hemispherical to irregularly rounded and up to 30cm or more across. It is usually grey to off-white in colour but may be completely white in dark caves. Rounded evenly spaced oscules are obvious all along the tops of the ridges. Unlikely to be confused with other species.
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Source: Encyclopedia of Marine Life of Britain and Ireland

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Distribution

A common species throughout most of the British Isles but apparently absent from North sea coasts.
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Source: Encyclopedia of Marine Life of Britain and Ireland

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Ecology

Habitat

Depth range based on 266 specimens in 1 taxon.
Water temperature and chemistry ranges based on 49 samples.

Environmental ranges
  Depth range (m): 0 - 53.5
  Temperature range (°C): 10.625 - 11.851
  Nitrate (umol/L): 4.757 - 8.618
  Salinity (PPS): 35.008 - 35.352
  Oxygen (ml/l): 6.013 - 6.346
  Phosphate (umol/l): 0.335 - 0.574
  Silicate (umol/l): 2.311 - 3.727

Graphical representation

Depth range (m): 0 - 53.5

Temperature range (°C): 10.625 - 11.851

Nitrate (umol/L): 4.757 - 8.618

Salinity (PPS): 35.008 - 35.352

Oxygen (ml/l): 6.013 - 6.346

Phosphate (umol/l): 0.335 - 0.574

Silicate (umol/l): 2.311 - 3.727
 
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 Pachymatisma johnstonia grows on bedrock and hard substrata in the intertidal and subtidal to 300 m depth. It is often found projecting into water currents off cliff walls. Found on overhangs in extremely sheltered waters but more common in areas with strong water movement.
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Common on bedrock and stable boulders from the littoral to 300m. A common species in sites with strong water movement, but also found under overhangs in extreme shelter.
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Source: Encyclopedia of Marine Life of Britain and Ireland

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Pachymatisma johnstonia

The following is a representative barcode sequence, the centroid of all available sequences for this species.


No available public DNA sequences.

Download FASTA File
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Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Pachymatisma johnstonia

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 11
Specimens with Barcodes: 11
Species With Barcodes: 1
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Wikipedia

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

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