Thiemella leonensis ( 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 : 195

Thiemella leonensis ( Hall, 1867)

Figs. 3B–D .

Orthis leonensis ; Hall 1867: 62, pl. 8: 3–8; Hall and Clarke 1892: 103, pl. 5c: 42, 43.

Dalmanella leonensis Hall, 1867 ; Williams 1908: 48, pl. 2: 1, 2, 5, 6, 9, 10, 13, 24.

Thiemella leonensis Hall ; Linsley 1994: 103, pl. 116: 13–20.

Material.—Figured specimens NYSM 15694, NYSM 15699, NYSM 15722; additional specimens NYSM 15726 (complete shell), NYSM 15700 (dorsal valve in matrix); eight unnumbered specimens on parts and counterparts of split slabs .

Remarks.— Thirteen specimens recovered (four complete adult shells) are consistent with Hall’s species described originally from the “arenaceous beds of the Chemung group near Leon, Conewego, and Randolph in Cattaraugus county”. Consequently the precise origin of his type material remains unknown. See comments on distribution of this form above. Schuchert and Cooper (1932) questionably attributed to William’s Orthis leonensis to Thiemella . Dutro (1981: fig. 7) was the first to definitively attribute this form to Thiemella .

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.