Gatunek typowy
L. pectinata Bassler, 1925 from the mid Frasnian of New York .

Opis

Emended diagnosis: The anteriormost element of the apparatus (ne) with a wide and flat cusp.

Nomenclatorial comment.- No doubt that Ligonodina, Lonchodina, and Hibbardella are closely related. Jeppson (1969), while proposing the first apparatus restoration of a prioniodinid, made choice of Ligonodina as the generic name and this has to be followed, contrary to later choices of Hibbardella and Prioniodina. Delotaxis Klapper & Philip, 1971 should not be used for Devonian species because its type species, the Silurian D. elegans (Walliser, 1964) is of a very primitive aspect. Its biramous S0 (tr) element, weakly asymmetric S2 (pl) elements, and M (ne) elements with short processes and a slightly basally bent cusp resemble rather the Ordovician Oulodus Branson & Mehl, 1933. Oulodus differs from Delotaxis only in having even more primitive M (ne) elements with radiating denticles, not parallel to the cusp as is the case in virtually all the post-Ordovician ozarkodinids.

Synonimy

Zasięg czasowy

Literatura

Dzik, J. 2002. Emergence and collapse of the Frasnian conodont and ammonoid communities in the Holy Cross Mountains, Poland. Acta Palaeontologica Polonica 47 (4): 565-650