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12 Cards in this Set
- Front
- Back
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Aperture |
open end of shell |
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Apex |
the "tip" of the shell, first formed part of the shell |
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Columella |
the solid or perforated pillar formed by the inner walls of a helical shell |
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inner lip |
inner border of the aperture |
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operculum |
a plate like cover of the aperture which is generally attached to the base of the foot |
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outer lip |
outer boundary of the aperture |
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shoulder |
any angularity in the whorl of the profile |
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spire |
part of the trochospiral shell excluding the last (time sequence) whirl |
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whorl |
part of the shell produced by one rotation about the coiling axis |
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dextral vs. sinistral |
hold the shell with the apex pointing upward and the aperture facing you. If the aperture is on the right side relative to the coiling axis then the shell is termed dextral, If the aperture is on the left, the shell is sinistral. |
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radula |
morphologic characteristic that is basically a chitin tooth that is used for feeding (often compared to a tongue which is inaccurate) |
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commisure |
opening of bivalves |
