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{%type%} Definitions

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Short "hint"

The embryonic shell of a mollusk (as a univalve).

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Usage examples (8)
  • Balearena gymnesica, enture shell 1 and protoconch.
  • The fine spiral lines of the protoconch are more likely to represent the still developing mantle anatomy of the snail embryo at the time of the secretion of its...
  • I'd be very interested in reading any studies that have examined the strength of genetic separation in examples like this same family, similar shell form, radically different...
  • However, one significant trait distinguishes B. gymnesica from both Mastus and Napaeus: the protoconch, or the embryonic whorls, of Balearena have spiral lines on bottom...
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