Overview

Comprehensive Description

Biology/Natural History: Some references show a shell with an interior which is almost entirely white except for a small brown apical blotch; and a pattern of radiating white lines interspersed with brown on the outside. Some say that the apex is slightly off center. This species was formerly considered to be a subspecies of Notoacmaea (now Tectura) scutum. The aperture is said to be nearly circular. These limptes often crawl down the surface of the rock to below the surface of the sand at low tide.

The name "fenestrata" refers to the checkerboard pattern of white and brown that is seen around the exterior margin of at least some of these limpets. Morris (1966) acknowledges the wide diversity of coloration within this species by recognizing two subspecies: A. fenestrata fenestrata, which is grayish green with flecks of pale yellowish. Its inside is bluish white with a narrow brown inside border. A. fenestrata cribraria, the northern form, is dark within the shell (almost solid brown). There are many intergrades where the two forms meet (central CA).

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Source: Invertebrates of the Salish Sea

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This limpet has an apex as the highest part of the shell, and the height is usually more than 1/3 the width. The apex is anterior to the middle of the shell. The exterior is dark olive or brown (or with white spots, or blotchy), and has no prominent radial ribs. The interior may be dark, but it is not uniformly dark and has an apical blotch (photo). Frequently a dark blue-gray interior margin grades into a dark brown blotch at the apex. The right and left margins are continuously curved without straight margins. The length is usually not more than 1.3 times the width. Usually not more than 2.6 cm long.
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© Rosario Beach Marine Laboratory

Source: Invertebrates of the Salish Sea

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Distribution

Geographical Range: Aleutian Islands to lower Baja California

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Source: Invertebrates of the Salish Sea

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Physical Description

Look Alikes

How to Distinguish from Similar Species: Tectura scutum usually has a height not more than 1/3 the width, usually has a pattern of blotches, and can grow to more than 5 cm diameter.
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© Rosario Beach Marine Laboratory

Source: Invertebrates of the Salish Sea

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Ecology

Habitat

Depth range based on 7 specimens in 1 taxon.
Water temperature and chemistry ranges based on 7 samples.

Environmental ranges
  Depth range (m): 0 - 0
  Temperature range (°C): 9.215 - 10.151
  Nitrate (umol/L): 6.665 - 6.725
  Salinity (PPS): 31.235 - 31.893
  Oxygen (ml/l): 6.561 - 6.794
  Phosphate (umol/l): 0.943 - 0.989
  Silicate (umol/l): 15.658 - 20.289

Graphical representation

Temperature range (°C): 9.215 - 10.151

Nitrate (umol/L): 6.665 - 6.725

Salinity (PPS): 31.235 - 31.893

Oxygen (ml/l): 6.561 - 6.794

Phosphate (umol/l): 0.943 - 0.989

Silicate (umol/l): 15.658 - 20.289
 
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Habitat: Frequently found on smooth boulders surrounded by sand in the mid to lower intertidal.

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Source: Invertebrates of the Salish Sea

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Wikipedia

Lottia fenestrata

Lottia fenestrata is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.[1]

Contents

Description

Distribution

References

  1. ^ Lottia fenestrata (Reeve, 1855). World Register of Marine Species, accessed 8 April 2010.
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