Aulacognathus, Mostler, 1967

Waid, Christopher B. T. & Cramer, Bradley D., 2017, Telychian (Llandovery, Silurian) conodonts from the LaPorte City Formation of eastern Iowa, USA (East-Central Iowa Basin) and their implications for global Telychian conodont biostratigraphic correlation, Palaeontologia Electronica 42 (6), pp. 1-37 : 22

Genus AULACOGNATHUS Mostler, 1967

Type species. Aulacognathus kuehni Mostler, 1967 .

Diagnosis. Apparatus composed of S 0, S 1/2, S 3/4, M, P 1, and P 2, elements. P 1 element has a ridged or nodose main blade with ridged, nodose, and/or lobate lateral processes. Some species have a platform developed between the lateral ridges and blade that may contain nodes. P 2 element anguliscaphate with a small outer lateral process extending from the cusp.