Designation of holotypes for new species of Iapetonudus Nicoll, Miller, Nowlan, Repetski and Ethington and Iapetognathus Landing

Abstract. In the course of publication of a large manuscript on earliest Ordovician conodont species and their utility for biostratigraphy (Nicoll et al., 1999), an error occurred, resulting in the lack of designation of holotypes for the type species of the genus Iapetonudus and some new species of Iapetognathus. Herein, we remedy this error so that the originally published specimens are regarded as fully established holotypes rather than as syntypes in the future.

As the original authors of these species, we establish the following holotypes: For the species Iapetognathus fluctivagus Nicoll, Miller, Nowlan, Repetski and Ethington, we designate the Pa element illustrated on Pl. 11, fig. 6, USNM 498962. For the species Iapetognathus jilinensis Nicoll, Miller, Nowlan, Repetski and Ethington, we designate the Pa element illustrated as Pl. 14, fig. 4, USNM 498973. For the species Iapetognathus landingi Nicoll, Miller, Nowlan, Repetski and Ethington, we designate the Pa element illustrated as Pl. 20, fig. 3, USNM 498996. For the species Iapetonudus ibexensis Nicoll, Miller, Nowlan, Repetski and Ethington, we designate the Pa element illustrated as Pl. 23, fig. 3, USNM 499009.