▁of ▁marine ▁b ival ve ▁m oll us cs , ▁including ▁the ▁scal lo ps ▁and ▁sp iny ▁o yst ers . ▁ ▁Sh ell ▁an atom y ▁All ▁members ▁of ▁this ▁super family ▁have ▁a ▁tri angular ▁res il ium ▁with ▁a ▁non min eral ized ▁med ial ▁core ▁that ▁functions ▁below ▁the ▁h inge ▁line . ▁ ▁Famil ies ▁According ▁to ▁the ▁World ▁Register ▁of ▁Marine ▁Species , ▁the ▁P ect ino idea ▁include ▁these ▁families : ▁ ▁Cy clo ch lam yd idae , ▁ ▁Ent oli idae , ▁ ▁P ect in idae , ▁( scal lo ps ) ▁ ▁Pro pe am us si idae , ▁some ▁are ▁known ▁as ▁glass ▁scal lo ps ▁ ▁Sp ond yl idae , ▁th orn y ▁o yst ers ▁ ▁Famil ies ▁brought ▁into ▁syn onym y ▁ ▁Pro pe am uss idae : ▁syn onym ▁of ▁Pro pe am us si idae ▁ ▁Syn cy cl on emat idae : ▁syn onym ▁of ▁Ent oli idae ▁ ▁References ▁ ▁R aines , ▁B . ▁K . ▁& ▁Po ppe , ▁G . ▁T . ▁( 2 0 0 6 ): ▁" The ▁Family ▁P ect in idae ". ▁In : ▁Po ppe , ▁G . ▁T . ▁& ▁Gro h , ▁K .: ▁A ▁Con ch ological ▁Icon ography . ▁ 4 0 2 ▁pp ., ▁ 3 2 0 ▁color ▁pl ts ., ▁Con ch Book s , ▁H ack en heim , ▁. ▁ ▁B iel er ▁R