The supposed vampyromorphids from the Kimmeridgian-Tithonian ( 156-146 mya ) of Solnhofen , Plesioteuthis prisca , Leptoteuthis gigas , and Trachyteutis hastiformis , can not be clearly assigned to this group ; they are large species ( from 35 cm in P. prisca to ) 1 meter in L. gigas ) and show features not found in vampyromorphids , being somewhat similar to the true squids , Teuthida ( Fischer & Riou 2002 ) . The supposed vampyromorphids from the Kimmeridgian-Tithonian ( 156-146 mya ) of Solnhofen , Plesioteuthis prisca , Leptoteuthis gigas , and Trachyteuthis hastiformis , can not be positively assigned to this group ; they are large species ( from 35 cm in P. prisca to ) 1 meter in L. gigas ) and show features not found in vampyromorphids , being somewhat similar to the true squids , Teuthida ( Fischer & Riou 2002 ) .