Praewaagenoconcha speciosa ( Hall, 1867 )

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

Praewaagenoconcha speciosa ( Hall, 1867)

Figs. 3I, J , 4F, G .

Productella speciosa ; Hall 1867: 175–176, pl. 25: 2–11.

“ Productella” speciosa ; Linsley 1994: 103, 225, pl. 119: 1–10.

Praewaagenoconcha speciosa ; Leighton 2000: 186, fig. 2A.

Material.—Figured specimens NYSM 15695, NYSM 15696, NYSM 15697, NYSM 15706, unfigured specimen NYSM 15698, and an estimated 60–80 unnumbered specimens on parts and counterparts of split slabs.

Remarks.—This is a common element of the lower Famennian Hanover brachiopod bed fauna represented by juvenile and adults shells (up to 25 mm in width). The upper Frasnian occurrences of Praewaagenoconcha speciosa ( Hall, 1867) and the closely related form P. lachrymosa ( Hall, 1867) in New York (see comments in Leighton 2000) are the oldest documented representatives of the genus in North America. Most other occurrences of the genus, primarily from the Great Basin ( Johnson et al. 1969; Bratton and Day 1997; Bratton 1997; Morrow 2000) of western North America are all early Famennian in age (see discussion above).

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.