Diagnoza

Cusp of P₁ element inclined dorsally followed by a single row of a few denticles, narrow icrion of P₁ elements with irregularly distributed denticles of the middle row, which are sometimes slightly higher than those of lateral rows; in mature specimens they merge to produce irregular transverse ridges.

Porównanie

The lineage of Icriodus reappears with this species after a gap in occurrence, when Pelekygnathus was the dominant icriodontid; in Kadzielnia there seems to be a continuity between I. alternatus and I. cornutus within the K. crepida Zone. Transitional samples show a great population variability, with specimens of morphologies similar to holotypes of I. alternatus, I. cornutus, and I. costatus occurring together.

Autekologia

Występowanie geograficzne

Zasięg czasowy

Rare specimens from the P. trachytera Zone are probably reworked. Icriodus apparently did not survive C. marginifera in the Holy Cross Mountains area, but in marginal parts of the Variscan basin (Pomerania and the Lublin area) the lineage seems to continue. 

Materiały muzealne

2,104 specimens. ZPAL

Literatura

Dzik, J. 2006. The Famennian "Golden Age" of conodonts and ammonoids in the Polish part of the Variscan sea. Palaeontologia Polonica 63, 1-359.