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Mopalia lignosa (Gould, 1846)
Length: to 80mm
Tegmentum colour: Variable; whitish, yellowish, olive, greyish
green or slate-blue and streaked or feathered with purplish to dark brown;
some white or creamy specimens have a concentric pattern of blackish zigzag
streaks.
Sculpture: Finely pitted all over. Head valve has about 8 narrow,
weak, radiating riblets and lateral areas are barely defined by a low
diagonal elevation. On the central areas, the pits are arranged in slightly
forwardly converging rows, and on the jugum the pits are diamond-shaped.
Girdle: Moderately wide, creamy to light brownish. Sparsely set
with long, curved, light brownish setae. These setae are set with tiny
spicules, only visible at a high magnification.
Bathymetric range: Intertidal
Geographic range: Sitka, Alaska to Magdalene Bay, Baja California;
23-57°N
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