AN INSIGHT INTO THE SYSTEMATICS OF PLICATOSTYLIDAE (BIVALVIA), WITH A DESCRIPTION OF &lt;em&gt;PACHYGERVILLIA ANGUILLAENSIS&lt;/em&gt; N. GEN. N. SP. FROM THE &lt;em&gt;LITHIOTIS&lt;/em&gt; FACIES (LOWER JURASSIC) OF ITALY
Rivista italiana di paleontologia e stratigrafia