Spergo
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Spergo is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae.
Siphonal canal
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The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantl
A shell of Penion cuvieranus cuvieranus, with the long siphonal canal visible extending toward the bottom of the image, at the anterior end of the shell.
