Fig. 1 in Agastograptus, a synonym of Plectograptus (Retiolitidae, Graptolithina)

Fig. 1. Phylogenetic relationships among the retiolitids (modified after Kozłowska−Dawidziuk 2001) with synapomorphies, and pictures of species originally included in the genus Agastograptus Obut and Zaslavskaya, 1983, showing their position in the Plectograptus, Spinograptus, Gothograptus, and Cometograptus lineages. Graptolite zonation after Koren' et al. 1995.