, ▁ 1 8 1 9 ▁( n omen ▁dub ium ) ▁Sp ond yl us ▁un icol or ▁G . ▁B . ▁S ower by ▁II , ▁ 1 8 4 7 ▁( n omen ▁dub ium ) ▁ ▁See ▁also : ▁T ik od ▁am o , ▁an ▁und es cribed ▁species ▁ ▁References ▁ ▁External ▁links ▁ ▁Sp ond yl idae ▁pictures ▁of ▁the ▁shell s ▁of ▁most ▁ext ant ▁species . ▁ ▁shell s ▁at ▁the ▁Rot ter dam ▁Natural ▁History ▁Museum ▁ ▁Session ▁Abstract s ▁on ▁Sp ond yl us ▁research ▁at ▁the ▁ 1 3 th ▁Me eting ▁of ▁the ▁European ▁Association ▁of ▁Arch ae olog ists ▁at ▁Z ad ar , ▁Cro atia , ▁September ▁ 2 0 0 7 ▁ ▁Information ▁about ▁Sp ond yl us ▁from ▁the ▁website ▁of ▁the ▁Glad ys ▁Arch erd ▁Sh ell ▁Collection ▁at ▁Washington ▁State ▁University ▁Tri - C ities ▁Natural ▁History ▁Museum ▁ ▁Article ▁on ▁" not ched " ▁Sp ond yl us ▁ ▁Ne ol ith ic ▁artifact s ▁in ▁Europe ▁ ▁Bibli ography ▁ ▁A ▁full ▁and ▁constantly ▁updated ▁bibli ography ▁on ▁Sp ond yl us ▁s pp . ▁in ▁A ege an , ▁B alk an , ▁European ▁and ▁American ▁context s ▁ ▁L amp rell , ▁Kevin ▁L .: ▁Sp ond yl us : ▁Sp iny ▁O yst er ▁Sh ells ▁of ▁the ▁World , ▁E . ▁J . ▁Br ill , ▁Le iden , ▁ 1 9 8 7 ▁▁▁ ▁Category : S