Order NASSELLARIA Ehrenberg, 1876

Phylogenetic Molecular Lineage I (Sandin et al. 2019)

DIAGNOSIS. — Multi-segmented Nassellaria having a simple cephalis and discrete dividers between the subsequent segments below the thorax.

REMARKS

Lineage I is the oldest clade in the entire Nassellaria order as the molecular clock indicates that it may date back to the Devonian (Sandin et al. 2019). Although only one genus Eucyrtidium was confirmed as a member of Lineage I, Amphipyndacoidea, Archaeodictyomitroidea and Eucyrtidioidea are likewise considered members of Lineage I. This inclusion is done because the huge number of studies devoted to them over the last century.