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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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© Rosario Beach Marine Laboratory

Source: Invertebrates of the Salish Sea

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