Phylogenetic analysis and revision of the trilobite subfamily Balnibarbiinae (Olenidae) Author Hopkins, Melanie J. text American Museum Novitates 2019 2019-05-07 2019 3928 1 1 https://bioone.org/journals/american-museum-novitates/volume-2019/issue-3928/3928.1/Phylogenetic-Analysis-and-Revision-of-the-Trilobite-Subfamily-Balnibarbiinae-Olenidae/10.1206/3928.1.full journal article 10.1206/3928.1 0003-0082 5369854 Cloacaspis ceryx anataphra ( Fortey, 1974 ) Figure 4B, C Balnibarbi ceryx anataphra Fortey, 1974: 30 , pl. 9, fig. 5-7. HOLOTYPE : Cranidium, PMO NF 651 (figured in Fortey, 1974 : pl. 9, fig. 5). TYPE LOCALITY : Profilstranda, Olenidsletta Member, Valhallfonna Formation, Ny Friesland, Spitsbergen, Svalbard . STRATIGRAPHIC RANGE : Fortey (1974) reported this subspecies from a single horizon about 8 m above the base of the Olenidsletta Member, which is estimated to be around 12.5 m in the 2016 stratigraphic section. Additional specimens were recovered in 2016 from 17–19 m in section, which extends the stratigraphic range of this subspecies, but the total range remains within the early half of the stratigraphic range of the other subspecies, Cloacaspis ceryx ceryx (fig. 1) . DIAGNOSIS: Cloacaspis ceryx species with relatively narrow preglabellar field (0.06–0.10 length of glabella) and smooth exoskeletal surface.