Diagnoza

 The ventral portion of the platform in P₁ elements distinctly narrowed, forming crests parallel to the carina.

Porównanie

Differes from probably ancestral Pinacognathus sulcatus in a more apparent separation of the ventral portion of the platform in P₁ elements from its dorsal part. The minute P₂ elements that may be potentially attributed to S. duplicata grade morphologically into juvenile P₂ elements of N. purus or N. vogesi. They seem to differ in a triangular gaping of the basal cavity. Perhaps the symmetry transition series of S. duplicata is represented by rare elements of morphologies similar to associated elements of Neopolygnathus purus but more gracile and with shorter processes in the S₁ and S₂ elements. If their attribution to S. duplicala is correct, the non-platform part of the apparatus in this species would be very gracile and small-sized. This resembles in some respects the apparatus of Vogelgnathus; perhaps in both cases a primitive appearance is related to small element size.

Autekologia

Występowanie geograficzne

Zasięg czasowy

Tournaisian, Zone of its own.

Materiały muzealne

ZPAL

Literatura

Dzik, J. 1997. Emergence and succession of Carboniferous conodont and ammonoid communities in the Polish part of the Variscan sea. Acta Palaeontologica Polonica 42, 57-170.