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Tusk shell
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==Reproduction and development== Scaphopods have [[dioecious|separate sexes]], and [[external fertilisation]]. They have a single [[gonad]] occupying much of the posterior part of the body, and shed their [[gamete]]s into the water through the nephridium. Once fertilized, the eggs hatch into a free-living [[trochophore]] larva, which develops into a [[veliger]] larva that more closely resembles the adult, but lacks the extreme elongation of the adult body.<ref name=IZ/> The three-lobed foot originates prior to metamorphosis while the cephalic tentacles develop post metamorphosis. Scaphopods remain univalved throughout their morphogenesis contrary to bivalves.<ref>{{Cite journal|last1=Wanninger|first1=Andreas|last2=Haszprunar|first2=Gerhard|date=2001|title=The expression of an engrailed protein during embryonic shell formation of the tusk-shell, Antalis entalis (Mollusca, Scaphopoda)|journal=Evolution & Development|language=en|volume=3|issue=5|pages=312β321|doi=10.1046/j.1525-142X.2001.01034.x|pmid=11710763|s2cid=8936294|issn=1525-142X}}</ref>
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