Editing Tusk shell (section)

=== Nervous system ===
The nervous system is generally similar to that of [[cephalopod]]s.<ref name=":0">{{Cite journal |last1=Sumner-Rooney |first1=Lauren H. |last2=Schrödl |first2=Michael |last3=Lodde-Bensch |first3=Eva |last4=Lindberg |first4=David R. |last5=Heß |first5=Martin |last6=Brennan |first6=Gerard P. |last7=Sigwart |first7=Julia D. |date=2015 |title=A neurophylogenetic approach provides new insight to the evolution of Scaphopoda: A neurophylogenetic approach in Scaphopoda|journal=Evolution & Development |language=en |volume=17 |issue=6 |pages=337–346 |doi=10.1111/ede.12164 |pmid=26487042|s2cid=37343813 }}</ref> One pair each of cerebral and pleural [[ganglion|ganglia]] lie close to the oesophagus, and effectively form the animal's [[brain]].

A separate set of pedal ganglia lie in the foot, and a pair of visceral ganglia are set further back in the body, and connect to pavilion ganglia via long connectives. Radular and sub-radular ganglia are also present, as are [[statocysts]] with [[staticonia]]. Scaphopods have no [[mollusc eye|eye]]s, no [[osphradia]],<ref name=SturmPearce2006>{{cite book |editor1-first=Charles F. |editor1-last=Sturm |editor2-first=Timothy A. |editor2-last=Pearce |editor3-first=Ángel |editor3-last=Valdés |title=The Mollusks: A guide to their study, collection, and preservation |year=2006 |publisher=Universal Publishing |place=Boca Raton, FL |isbn=978-1-58112-930-4 |page=2 |url=https://books.google.com/books?id=-NbmHx93s8gC&pg=PA2}}</ref> or other distinct sensory organs.<ref name=IZ>{{cite book |last=Barnes |first=Robert D. |year=1982 |title=Invertebrate Zoology |publisher=Holt-Saunders International |location=Philadelphia, PA |pages=432–434 |isbn=0-03-056747-5}}</ref> However, scaphopods do possess genes involved in photoreceptor formation and function implying scaphopods may have had eyes that degenerated over evolutionary time.<ref>{{cite journal |last1=Wollesen |first1=Tim |last2=McDougall|first2=Carmel |last3=Arendt |first3=Detlev |date=2019-10-19 |title=Remnants of ancestral larval eyes in an eyeless mollusk? Molecular characterization of photoreceptors in the scaphopod Antalis entalis |journal=EvoDevo |volume=10 |issue=1 |page=25 |doi=10.1186/s13227-019-0140-7 |issn=2041-9139 |pmc=6800502 |pmid=31641428 |doi-access=free }}</ref>