Diagnoza

Porównanie

The Dinodus symmetry transition series set of elements shows no correlation with Siphonodella P₁ elements in its stratigraphic distribution. 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. 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. 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

Materiały muzealne

Literatura