Fitzroyella sp.

Baliński, Andrzej, 2006, Brachiopods and their response to the Early-Middle Frasnian biogeochemical perturbations on the South Polish carbonate shelf, Acta Palaeontologica Polonica 51 (4), pp. 647-678 : 656

Fitzroyella sp.

Fig. 7D, E .

Material.—One complete and two fragmentarily preserved shells were recovered from Wietrznia Id−W (bed 4 and loose debris) and Wietrznia II sections.

Remarks.—The specimens here described differ from those described above as Fitzroyella alata Biernat, 1969 being not as wide and by having non alate cardinal margin. The cardinal margin of the studied specimens is narrower the maximum width of the shell, and the shell is almost subquadrate in outline. Moreover, shell ribbing of these specimens seems to be not as strong as in F. alata. The specimens show some similarity in general shell form and ribbing to Fitzroyella hartensis Struve, 1978 and Fitzroyella inversicor lapicidinae Struve, 1978 , both from the early part of the Frasnian of Germany ( Struve 1978). Unfortunately, more precise identification of the species from Wietrznia is not possible at present due to inadequate studied material. On the other hand Biernat (1969: 385) emphasised great intraspecific variability in F. alata and remarked that in her collection occur specimens which could be considered as representatives of each known at that time species of Fitzroyella .

Occurrence.—The studied specimens were found in set C of the Wietrznia Id−W and Wietrznia II sections representing Palmatolepis transitans conodont Zone.

Figures

Fig. 7. Rhynchonellid brachiopods from the Frasnian of Wietrznia and Dębnik. A, B. Hypothyridina sp., ZPAL Bp 60/28 (A) and GIUS 4−273 Wt/IM−4 (B), two complete shells from the middle Wietrznia Beds of Wietrznia Ie and Id−W, respectively, in dorsal (A1, B1), ventral (A2, B2), lateral (A3, B3), posterior (A4, B4), and anterior (A5, B5) views. C. Fitzroyella alata Biernat, 1969, GIUS 4−273 Wt/GR−1, complete shell from the middle Wietrznia Beds of Wietrznia Id−W. D, E. Fitzroyella sp. from the middle Wietrznia Beds of Wietrznia Id−W. D. Incomplete specimen GIUS 4−273 Wt/IM−7 in dorsal (D1) and ventral (D2) views. E. Complete shell GIUS 4−273 Wt/GR−2 in dorsal (E1), ventral (E2), lateral (E3), posterior (E4), and anterior (E5) views. F, G. Plionoptycherhynchus cracoviensis (Gürich, 1903) from the Nodular Limestone (Palmatolepis hassi Zone) of Dębnik. F. ZPAL Bp 60/17, fragment of a large shell in ventral view. G. ZPAL Bp 60/4, complete shell in dorsal (G1), ventral (G2), lateral (G3), posterior (G4), and anterior (G5) views. H. Phlogoiderhynchus polonicus (Roemer, 1866) from the middle Wietrznia Beds of Wietrznia Id−W, shell GIUS 4−273 Wt/IM−8 in dorsal (H1), ventral (H2), lateral (H3), posterior (H4), and anterior (H5) views.