Article: Conodonts of the genus Apatognathus Branson and Mehl from the Yoredale Series of the north of England

The paper describes six species of conodonts assigned to the genus Apatognathus Branson and Meh 1934, from the Yoredale Series of the Askrigg and Alston Blocks in northern England. A ? chaulioda, A ? cuspidata, A? librata, A?petila, and A? scalena are new species, whilst A?gemina (Hinde) is redescribed. The previously recorded occurrences of the genus are listed along with a consideration of possible homeomorphy. The orientation of the genus is reorganized and the distribution of the Yoredale species through the series described. The possibility of facies control of the genus during Carboniferous times is also discussed.