Swisher et al.—Achatella Delo, 1935
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Figure 7. Achatella carleyi (Meek, 1872), Cincinnati region, Ohio. (1, 2) Cephalon (CM 51280c), dorsal and anterior views, x9, middle Fairview Formation, Cincinnati, Hamilton County, Ohio, off 747 on Dues Road at intersection with Ocean Road; (3) pygidium (CM 31699c), dorsal view, ×10, Lorraine Group”, Cincinnati, Ohio; (4, 5) pygidium (CM 51280d), posterior and dorsal views, ×7, middle Fairview Formation, Cincinnati, Hamilton County, Ohio, off 747 on Dues Road at intersection with Ocean Road; (6) cephalon (CM 31699b), dorsal view, ×6, “Lorraine Group,” Cincinnati, Ohio.
?1914 Dalmanites achates; Foerste, p. 147, pl. 1, fig. 18. 1919 Pterygometopus achates;Foerste,p.397,pl. 19, fig. 8. ?1919 Pterygometopus carleyi-rogersensis; Foerste, p. 398, pl. 19, figs. 18a, b.
1921 Dalmanites achates; Raymond, p. 38, pl. 11, fig. 3. 1935 Achatella achates, Delo, p. 416, figs. 38, 39. 1940 Achatella achates, Delo, p. 110, p1. 13, figs. 19-21.
?1940 Achatella carleyi var. rogersensis; Delo, p. 111, p1. 13, figs. 25.
1942 Achatella achates; Okulitch, p. 104, p1. 1, fig. 1. 1944 Achatella billingsi Sinclair, p. 17, p1. 1, figs. 1, 2. 1947 Achatella achates; Wilson, p. 60, p1. 10, fig. 16.
1947 Pterygometopus billingsi; Wilson, p. 55, p1. 10, figs. 4a and b.
1999 Achatella achates; Brett et al., p. 300, fig. 8.4 2002 Achatella achates; Whitely et al., p. 145, pl. 115.
1978a Achatella achates; Ludvigsen, p1. 5, fig. 47. 1979 Achatella achates; Ludvigsen, fig. 47a and b. 1982 Achatella achates; Ludvigsen and Chatterton, p. 2183, pl. 1, figs. 1–7, fig. 3.
Diagnosis.—Eye extending from L3 to S2 or anterior tip of L2; located very close to glabella anteriorly, so that palpebral ridge barely recognizable. Conspicuous glabellar tubercles on each side of anterior glabellar embayment. Lateral cephalic margin evenly curved. Pygidium with pointed posterior margin.
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