Cyrtospirifer Nalivkin

Baliński, Andrzej, 2002, Frasnian-Famennian brachiopod extinction and recovery in southern Poland, Acta Palaeontologica Polonica 47 (2), pp. 289-305 : 303

publication ID

https://doi.org/ 10.5281/zenodo.13304675

persistent identifier

https://treatment.plazi.org/id/A96687CB-2433-FFBB-FF89-FC64003EF907

treatment provided by

Felipe (2024-07-19 00:38:56, last updated 2024-08-12 11:49:52)

scientific name

Cyrtospirifer Nalivkin
status

 

Genus Cyrtospirifer Nalivkin View in CoL in Frederiks, 1929 Cyrtospirifer minor ( Gürich, 1903)

Fig. 8F View Fig .

Spirifer Archiaci Vern. View in CoL var. minor Gürich ; Gürich 1903: 142–143, pl. 1:

4–7. Spirifer Archiaci Vern. View in CoL var. minor Gür. ; Jarosz 1919: pl. 8: 23. Cyrtospirifer minor ( Gürich, 1903) ; Baliński 1979: 67–69, fig. 22,

pl. 17: 1–11. Material.—Two complete, 11 slightly damaged and 69 fragments of shells and valves.

Remarks.—This small Cyrtospirifer species is one of the commonest brachiopods in the lowermost Famennian beds exposed in trench Z−17 near Dębnik. It is most abundant in set II where it dominates (together with Pampoecilorhynchus geniculatus sp. nov.) the assemblage. Cyrtospirifer minor was described by Baliński (1979) from slightly younger horizons, but still representing Pa. triangularis conodont Zone. The oldest occurrence of the species is in trench Z−6 and the basal set I of trench Z−17 (about 0.7 m below Frasnian– Famennian boundary) in the highest Frasnian Ryocarhynchus tumidus brachiopod zone. C. minor is very rare in this horizon, however, being represented exclusively by single broken valves.

Balinski A. 1979. Brachiopods and conodonts from the Frasnian of the Debnikanticline, southernPoland. Palaeontologia Polonica 39: 1 - 95.

Gurich, G. 1903. Das Devon von Debnik bei Krakau. Beitrage zur Palaontologie und Geologie Osterreich-Ungarns und des Orients 15: 127 - 164.

Jarosz, J. 1919. Studien uber das Krakauer Devon. I-Teil: Das obere Famennian in der Umgebung von Debnik. Bulletin International de l'Academie des Sciences, Serie B 1918: 85 - 130.

Gallery Image

Fig. 8. Early Famennian brachiopods, trench Z−17, Dębnik anticline, Poland. A, B. Crinisarina angelicoides (Merriam, 1940). A. Complete shell Bp 46/49a in dorsal, lateral, and anterior views. B. Complete shell Bp 46/49b in dorsal, ventral and anterior views. C–E. Pygmis jablonensis (Biernat, 1983); three shells Bp 46/57a, b, and c in dorsal, ventral, lateral, posterior, and anterior views. F. Cyrtospirifer minor (Gürich, 1903); adult shell Bp 46/1a in dorsal, lateral, and anterior views. G. Warrenella sp.; incomplete shell Bp 46/16 in ventral view. All × 1.5.

Kingdom

Animalia

Phylum

Brachiopoda

Class

Rhynchonellata

Order

Spiriferida

Family

Cyrtospiriferidae