Key:  Family Glycymerididae

Taken primarily from  Kozloff, 1987, 1996 p. 269 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)

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1a	Radial ribs obvious, even if rather faint (they are least likely to be visible in small specimens); hinge with about 15 or 16 teeth, the anterior and posterior sets decidedly separated; periostracum thick, dark brown; subtidal species (Glycymeris (Axinola) subobsoleta in original key)	Glycymeris septentrionalis
1b	Radial ribs so faint that they are not likely to be visible without magnification; hinge with about 20 teeth, the anterior and posterior sets close together; periostracum thin, tan; rare	Glycymeris (Axinola) corteziana

  Glycymeris septentrionalis

Salish Sea Invertebrates web site provided courtesy of Walla Walla University