Schizophoria striatula       (von Schlotheim 1813)

 Santa Lucia Formation. Cantabrian Mountain. Spain

        Schizophoria striatula        (von Schlotheim 1813)

 Santa Lucia Formation. Cantabrian Mountain. Spain

  Spinatrypa aspera  (Schlotheim, 1813)

 Holy Cross Mountains. Polonia.

  Spinatrypa aspera  (Schlotheim, 1813)

 Holy Cross Mountains. Polonia.

      Spinatrypa dorsata      (Biernat, 1964)

 Portilla Formation. Cantabrian Mountains. Spain.

Spinatrypina sp

 Santa Lucia Formation. Valle del Esla . Leon. Spain.

Spinatrypina sp 

Santa Lucia Formation. Cantabrian Mountains. Spain.

  Spinocyrtia ostiolata  (Schlotheim, 1820)

Gerolstein. Germany.

Spinocyrtina elegans

Colle ( Leon ).

Spinocyrtina elegans

Colle ( Leon ).

Spinocyrtina elegans

Colle ( Leon ).

Spinocyrtina elegans

Colle ( Leon ).

               Spirifer S.P           (SOWERBY, 1818)

Smoke Creek.Moscow Formation. USA

Spirifer verneuili (Cyrtospirifer verneuili) (Murchison 1840)

 Belgica

     Strophodonta crassa     (Meek and Hayden, 1858)

Potter Granja Fm. de Alpena, Michigan.