Cloacaspis ceryx anataphra ( Fortey, 1974 )

Hopkins, Melanie J., 2019, Phylogenetic analysis and revision of the trilobite subfamily Balnibarbiinae (Olenidae), American Museum Novitates 2019 (3928), pp. 1-1 : 1-

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.

Figures

FIGURE 4. Cloacaspis spp. A. Cloacaspis ekphymosa Fortey, 1974, USNM 144232. Collected from the Lost River Area on Seward Peninsula, Alaska, and previously identified as Triarthrus sp. (Ross, 1965). Arrow pointing to postpalpebral furrow. B. Anterior border of Cloacaspis ceryx anataphra (Fortey, 1974), AMNH- FI-101655. Black arrows pointing to faint anterior border pits on internal mold. C. Cloacaspis ceryx anataphra (Fortey, 1974), AMNH-FI-101655. Collected from PO-18 of the Olenidsletta Member of the Valhallfonna Formation (Kröger et al., 2017). D) Cloacaspis ceryx ceryx (Fortey, 1974), AMNH-FI-101657. Close-up of E, anterior glabellar lobe and F,posterior wing, showing presence of fine granulation of recently prepared surface (white arrow) and lack of granulation on exposed and slightly eroded surface (black arrow). Collected from bed PO-18 of the Olenidsletta Member of the Valhallfonna Formation (Kröger et al., 2017). Scale bars = 1 mm except A and D, where scale bar = 5 mm.