{{Short description|Part of the radula in some molluscs}} [[File:Hyaline shield.jpg|thumb|300px|The hyaline shield (hy.sh.) attached to an ''Octopus'' radula. Scale bar: 0.5 mm.]] The '''hyaline shield''' is a part of the radula in many kinds of molluscs. It serves as an attachment point for the muscles that retract the radula, and is thus located on the upper surface of the radula, arching backwards into the mouth. This retraction fires any food particles backwards into the mouth.<ref name="Messenger1999">{{Cite journal | doi = 10.1098/rstb.1999.0369 | jstor = 56840 | last1 = Messenger | first1 = J. B. | last2 = Young | first2 = J. Z. | title = The Radular Apparatus of Cephalopods | journal = Philosophical Transactions: Biological Sciences | volume = 354 | issue = 1380 | pages = 161–182 | year = 1999 | pmc = 1692476 }}</ref>
The hyaline shield is constructed from chitin<ref name="Messenger1999" /> and is present in most radula-bearing molluscan groups, including the cephalopods<ref name="Messenger1999" /> and the chitons.<ref name="Shaw2010">{{Cite journal | last1 = Shaw | first1 = JA | last2 = Macey | first2 = DJ | last3 = Brooker | first3 = LR | last4 = Clode | first4 = PL | title = Tooth use and wear in three iron-biomineralizing mollusc species | journal = The Biological Bulletin | volume = 218 | issue = 2 | pages = 132–44 | year = 2010 | pmid = 20413790 | doi=10.1086/bblv218n2p132 }}</ref>
== References == {{reflist}}
Category:Mollusc anatomy
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