Cloacaspis tesselata Fortey and Droser, 1999

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

Cloacaspis tesselata Fortey and Droser, 1999

Figures 5–7

Clocaspis tesselata Fortey and Droser, 1999: 187 , fig. 3.1–3.5.

HOLOTYPE: Cranidium, USNM 495868 (figured in Fortey and Droser, 1999: fig. 3.4).

TYPE LOCALITY: “Olenid bed,” Antelope Valley Formation, Little Rawhide Mountain, Hot Creek Range, Nye County, Nevada.

OTHER OCCURRENCES: Antelope Valley Limestone, June Canyon Sequence, Ike’s Canyon, Nevada.

STRATIGRAPHIC RANGE: Lower Dapingian. See discussion for more detail.

Figures

FIGURE 5. Cloacaspis tesselata Fortey and Droser, 1999, specimens from Little Rawhide Mountain, Nevada. A. Librigena, AMNH-FI-115819. Specimen oriented relative to cranidium shown in B. B. Cranidium, AMNH- FI-115818. C. Librigena, AMNH-FI-115820. D. Paratype librigena, USNM 495690. Close-ups of B: E, posterior wing showing anastomizing lines along dorsal suture and glabella (white arrows) and curvature of distal part of posterior furrow (black arrow); and F, glabellar lobe L1, showing anastomizing lines and very fine granulation. G. Cranidium, AMNH-FI-115807. H. Cranidium, AMNH-FI-115808. All specimens except paratype collected by author in 2015. Scale bar = 1 mm.

FIGURE 6. Cloacaspis tesselata Fortey and Droser, 1999, specimens from Ike’s Canyon, Nevada. A. External mold of cranidium, USNM 720100. From USGS-D2219. B. Latex mold of cranidium, AMNH-FI-115823, cast from USNM 720100 (see A). C. Cranidium, AMNH-FI-115825. Found in Columbia University collections. D. Cranidium, AMNH-FI-115824. Found in Columbia University collections. E. Cranidium and thorax, USNM 720101. From USGS D2282-CO. Scale bar = 1 mm.

FIGURE 7. Cloacaspis tesselata? Fortey and Droser, 1999, specimens from Ike’s Canyon, Nevada. A. Dorsal view of fused librigena, USNM 720102 (part). From USGS-D2217. B. Ventral view of fused librigena, USNM 720102 (counterpart). C. Close-up of anterior part of librigena USNM 720102 (counterpart), showing fusion and triangular projection. D. Close-up of advanced genal spine on librigena USNM 720102 (part). E. Pygidium, USNM 720103. From USGS D2217. F. Lateral view of pygidium, USNM 720103. Scale bar = 1 mm, except for A and B, where scale bar = 5 mm.