Overview

Comprehensive Description

Description

 Smooth, translucent brownish yellow - horn coloured shell, up to 2 cm in length and much smaller than the common limpet (Patella spp.). Oval in outline in the shape of a depressed cone with the apex at the anterior end. The shell is overlayed by 2-8, characteristic, broken (dashed) blue-green rays, although these are absent from the juvenile shell until they reach 1.1mm in length.Specimens found in cavities in holdfasts develop into the laevis form (Helcion pellucidum var. laevis). The laevis form has a taller, more robust opaque shell, ledged in profile, with blue rays that alternate with reddish brown rays. The most noticeable ledge of the shell indicates the size at which the individual enters the holdfast.

 Weber et al. (1997) suggested that Helcion pellucidum was genetically distinct from its South African con-geners and may have arisen independently. Recent studies of morphological features (Ridgeway et al., 1998) and molecular characteristics (Koufopanou et al., 1999) suggest that Helcion pelludicum belongs to the genus Patella.

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Source: Marine Life Information Network

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Physical Description

Type Information

Unconfirmed type for Helcion pellucidum Linnaeus, 1758
Catalog Number: USNM 178028
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Dry
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© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Ecology

Habitat

Depth range based on 134 specimens in 1 taxon.
Water temperature and chemistry ranges based on 25 samples.

Environmental ranges
  Depth range (m): 0 - 38.5
  Temperature range (°C): 9.439 - 18.050
  Nitrate (umol/L): 1.033 - 7.121
  Salinity (PPS): 35.008 - 36.318
  Oxygen (ml/l): 5.477 - 6.414
  Phosphate (umol/l): 0.106 - 0.533
  Silicate (umol/l): 0.940 - 3.727

Graphical representation

Depth range (m): 0 - 38.5

Temperature range (°C): 9.439 - 18.050

Nitrate (umol/L): 1.033 - 7.121

Salinity (PPS): 35.008 - 36.318

Oxygen (ml/l): 5.477 - 6.414

Phosphate (umol/l): 0.106 - 0.533

Silicate (umol/l): 0.940 - 3.727
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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 Found on the blade of Laminarians or fronds of Fucus serratus, Mastocarpus stellatus or Himanthalia elongata from the lower eulittoral to a depth of ca 27 m. Newly settled juveniles found on encrusting coralline algae in wave exposed conditions in the lower eulittoral. It prefers areas of considerable water flow and is not normally found in areas of low flow, siltation or freshwater influence.
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Patina pellucida

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 1
Species With Barcodes: 1
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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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