Key:  Class Scaphopoda

Taken primarily from  Kozloff, 1987, 1996 p. 289 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)

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Lower taxonomic level	Main Page	Alphabetic Index	Systematic Index	Glossary

1a	Median tooth of radula twice as wide as long; foot conical; shell length commonly exceeding 2 cm	2
1b	Median tooth of radula nearly as long as wide; foot wormlike, but can be expanded at the tip into a disk; shell length generally less than 2 cm	4
2a	Shell robust, with a narrow slit originating at the posterior aperture (this portion of the shell may be broken off, however)(inhabiting gravel that consists to a large extent of shell fragments)	Dentalium pretiosum
2b	Shell fragile, without a narrow slit originating at the posterior aperture even if this portion of the shell has not been broken off	3
3a	Surface of shell smooth (ovary of female yellow, visible through shell; inhabiting silt or sand) (was Dentalium rectius in key)	Rhabdus rectius
3b	Surface of shell with fine ribs or lines	Dentalium agassizi
4a
4b
5a
5b
6a
6b

  Rhabdus rectius

Salish Sea Invertebrates web site provided courtesy of Walla Walla University