Chapinella, Savage, Eberlein, and Churkin, 1978

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 : 196

Chapinella ? sp.

Fig. 3G .

Material.—One partial ventral valve NYSM 15727, numerous unnumbered valve fragments, one ventral, and one partial dorsal valve (both unnumbered) on parts and counterparts of split slabs.

Remarks.—This form is a relatively common element of the HanoverShalefauna,althoughmostfrequentlyrepresentedby broken shell fragments of dorsal and ventral valves. The angular plications bounding the sulcus and upper part of the tongue ( Fig. 3G ) arise anterior of mid−valve, and do not extend posteriorly to near the beak. External ornament preserved on external molds of partial ventral valves shows very fine concentric growth lines and very fine radial microcapillate microornament. It resembles species of Chapinella Savage et al., 1978 , and is provisionally placed in that genus pending recovery of sufficient specimens to verify its identity.

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.