Schellwienella pauli Gallwitz, 1932

Halamski, Adam T. & Baliński, Andrzej, 2009, Latest Famennian brachiopods from Kowala, Holy Cross Mountains, Poland, Acta Palaeontologica Polonica 54 (2), pp. 289-306 : 292

Schellwienella pauli Gallwitz, 1932

Fig. 2F, H, I .

?1882 Streptorhynchus umbraculum Schloth. ; Kayser 1882: 63–64, pl. 1: 10–11 [non Xystostrophia umbraculum (Schlotheim, 1820) ].

?1929 Streptorhynchus (Schellwienella) cf. umbraculum ; Dehée 1929: 36, pl. 5: 9.

1932 Schellwienella pauli sp. nov.; Gallwitz 1932: 104–106, pl. 6: 23–25.

1969 Schellwienella umbraculum ; Kaliś 1969: pl. 1: 5.

1976 Schellwienella? pauli (Gallw.) ; Matyja 1976: pl. 2: 1–2, 6.

Material.— 15 specimens from set L, ZPAL Bp 57/3, 20, 97, 100–103 .

Description.—Shell large (attaining at least 45 mm in width), transverse (length to width ratio 0.61–0.78), ventribiconvex. Outline ovate, except fot straight cardinal margin. Maximal width anteriorly to midlength. Anterior comissure rectimarginate, no sulcus or fold. Ventral interarea apsacline, triangular, relatively high (height to width ratio about 1/5), transversely striate. Pseudodeltidium well developed, convex. Dorsal interarea anacline, linear. Chilidium small, with weak median groove.

Ornamentation of costae and costellae, the latter appearing by intercalation, of different heights and thicknesses at anterior margin, 11–13 per 5 mm. Concentric microlines visible in the anterior region.

A single ventral interior ( Fig. 2I ) shows triangular adductor scars with their lateral borders diverged at ca. 80 ° and extended to about 2/5 of the valve length, anteriorly faintly flabellate, medially separated by a low ridge.

Dorsal interior unknown.

Remarks.—Ten epibiontic Microcornus sp. were observed on the dorsal valve of the specimen ZPAL Bp 57/101; they are grouped preferentially in the anterior region of the valve.

This species was described by Gallwitz (1932) on the basis of external casts. No revision of the this species has ever been made, and the described sample is referred to it on the basis of external characters only.

Stratigraphic and geographic distribution.— Velbert Anticline ( Rhenish Slate Mountains ), Holy Cross Mts., Pomerania, and Lublin Basin ( Poland); Upper Devonian, Famennian, most probably “Strunian” .

Figures

Fig. 2. Middle to Latest Famennian brachiopods from Kowala. A. Barroisella sp. The bivalved specimen ZPAL Bp 57/70a showing strongly exfoliated ventral valve (ventral internal mould) and interior of dorsal valve (lower right) (A1) and its counterpart ZPAL Bp 57/70b (A2); enlargement of the posterior region of the ventral valve showing pseudointerarea and elongated median muscle scar (A3). B–E. Aulacella interlineata (Sowerby, 1840). B–D. Three shells ZPAL Bp 57/4a, 4b, and 86, respectively, in dorsal (B1, C1, D1) and ventral (B2, C2, D2) views showing variability in the shell outline. E. Dorsal valve ZPAL Bp 57/5 exterior (E1) and interior (E2). F, H, I. Schellwienella pauli (Gallwitz, 1932). F. Slightly destroyed shell ZPAL Bp 57/20 in dorsal (F1), ventral (F2), lateral (F3), posterior (F4), and anterior (F5) views. H. Limestone block ZPAL Bp 57/103 with accumulation of shells of S. pauli. I. Interior of ventral valve ZPAL Bp 57/100. G. Productida indet., mould ZPAL Bp 57/7 of exfoliated dorsal valve. J. Productida indet. Posterior view of mostly decorticated and slightly crushed dorsal valve ZPAL Bp 57/8. K. Mesoplica sp. Ventral valve ZPAL Bp 57/1 in ventral (K1) and posterior (K2) views. Scale bars 5 mm.