Schizophoria, King, 1850

Day, Jed & Over, D. Jeffrey, 2002, Post-extinction survivor fauna from the lowermost Famennian of eastern North America, Acta Palaeontologica Polonica 47 (2), pp. 189-202 : 195

Schizophoria (S.) sp.

Fig. 3A .

Material.—The figured partial ventral valve NYSM 15701.

Remarks.—A single partial ventral valve representing Schizophoria (S.) sp. was recovered from Hanover Shale shell bed. The exfoliated ventral valve does not permit a definite species assignment, although it features molds of the impressed bilobate diductor scars ( Fig. 4A ) divided by a medial ridge (site of adductor attachment) extending 2–3 mm beyond the diductor muscle field. The only Late Devonian species of Schizophoria described from New York with the ventral medial adductor ridge extending well beyond the diductor scars is S. (S.) impressa ( Hall 1867: pl. 8: 11–19).

Figures

Fig. 3. Brachiopod fauna of the shell bed in upper Hanover Shale Member of the Java Formation. A. Schizophoria (S.) sp. upper view of exfoliated ventral valve, NYSM 15701, × 1.7. B–D. Thiemella leonensis (Hall, 1867). B. Dorsal valve of juvenile specimen, NYSM 15722, × 4.6. C. Ventral valve, NYSM 15694,×2. D.Ventralviewofnearlycompleteshellextractedfrommoldiccavitytoleft,NYSM15699,×2.2.E, F. Ripidiorhynchus?sp. E.Upperviewofventralvalvewithplicaextendingfromanteriormargintobeakofvalve,NYSM15723,×2. F.Partialventralvalveshowingmedialandleftlateralflankplications, NYSM15724,×2. G. Chapinella?sp.,ventralvalvewithlateralplicationsnearshellmargin,NYSM15727,×2. H.Genusandspeciesuncertain,ventralvalve withradialplicaextendingfromanteriorandlateralmarginstobeakofNYSM15728,×4. I, J. Praewaagenoconcha speciosa (Hall,1867). I.Interiorofdorsal valve showing bilobed cardinal process, NYSM 15696, × 2. J. Upper view of ventral valve showing quincuncially arranged spines, NYSM 15697, × 2.

Fig. 4. Brachiopods from the shell bed in the Hanover Shale Member of the Java Formation. A–D. Retichonetes aff. S. obscurus Cooper and Dutro, 1982. A. Internal mold of dorsal valve, NYSM 15704 with low medial myophragm, simple sockets flanking the pit near base of cardinal process, × 5.4. B. Upper exteriorviewofdorsalvalve,NYSM15710,×4.8. C.Internalmoldofdorsalvalve,NYSM15705,×7. D.Ventralvalveshowingcostellaewithcrushedand distorted ventral valve of Ambocoelia cf. A. gregaria in upper left, NYSM 15718, × 3.3. E. Tylothyris mesacostalis (Hall, 1867), view of dorsal valve showing centric lamellose ornament and central groove on fold, NYSM 15711, × 2.3. F, G. Praewaagenoconcha speciosa (Hall, 1867). F. Internal mold of dorsal valve with impression of medial myophragm and rugae along the postero−lateral margin, NYSM 15706, × 1.7. G. External mold of dorsal valve showing radial spine bases with some exfoliated shell material, NYSM 15695, × 1.5. H, I. Cyrtospirifer hornellensis Greiner, 1957. H. Exfoliated dorsal valve showing extended postero−lateral extremity, NYSM 15692. I. Ventral valve, NYSM 15691; both × 1.8.J. Ambocoelia cf. A. gregaria Hall, 1867, upper view of flattened dorsal valve showing dorsal groove, NYSM 15719 × 3.5.