Post-extinction survivor fauna from the lowermost Famennian of eastern North America Author Day, Jed Author Over, D. Jeffrey text Acta Palaeontologica Polonica 2002 2002-12-31 47 2 189 202 journal article 300554 10.5281/zenodo.13174914 c2009942-e0f2-4d16-b1ef-026cefdf1680 1732-2421 13174914 Cyrtospirifer hornellensis Greiner, 1957 Fig. 4H, I . Cyrtospirifer hornellensis ; Greiner 1957: 28–29 , pl. 7: 1–5, 6 (not dorsal valve specimen on right−hand part of image of Yale Peabody Museum number 19435B), and 7. Material .—Figured specimens NYSM 15691 and NYSM 15692. Remarks .—The available specimens are consistent with the species as described by Greiner (1957: 29) . It must be pointed out that Greiner (1957) illustrated at least two distinct genera under the name C. hornellensis . One of the two dorsal valves (his “larger, presumably gerontic, individual” of Yale Peabody Museum number 19435B) illustrated in his pl. 7 (fig. 6, right−hand specimen) represents a new genus, which will be described (Ma and Day personal communication 2001) from the lower Famennian of South China . Cyrtospirifer hornellensis is about half the size (width), has a narrower sinus and fewer flank plications, and lacks the medial groove on the dorsal fold of the much larger Cyrtospirifer sulcifer ( Hall and Clarke, 1894 ) . That form serves as the nominal species for the lowest Famennian C. sulcifer Assemblage Zone of Dutro (1981: 80 , figs. 2, 7). As defined, that zone spans the interval of the Canadaway Group, immediately above the Java Formation of New York . Cyrtospirifer sulcifer ( Hall and Clarke, 1894 ) is not a true Cyrtospirifer and is considered here a species of Pripyatispirifer Pushkin (1996) . According to Greiner (1957) his illustrated specimens of C. hornellensis were collected 140 feet (42.6 meters) below the top of the upper Frasnian Wiscoy Formation (now Java Formation) and overlying deposits of the lower Famennian “Casaseraga formation” (= Caneadea Formation of the modern nomenclature). Greiner portrays its upper range (see his fig. 4) as somewhere high in the lower Famennian. Thus far, our material represents its lowest Famennian occurrence directly associated with Lower Pa. triangularis Zone conodonts in the upper part of the Hanover Shale of eastern North America.