Leptoterorhynchus magnus (Biernat and Racki, 1986)

Halamski, Adam T. & Baliński, Andrzej, 2009, Latest Famennian brachiopods from Kowala, Holy Cross Mountains, Poland, Acta Palaeontologica Polonica 54 (2), pp. 289-306 : 294-295

Leptoterorhynchus magnus (Biernat and Racki, 1986)

Figs. 3B, C, 4 .

1986 Rozmanaria magna sp. nov.; Biernat and Racki 1986a: 90–95, text−figs. 2–5, pls. 35: 1–5, 36: 1–5, 37: 3–5, 41: 4, 42, 43.

1986 Rozmanaria magna Biernat and Racki ; Biernat and Racki 1986b: figs. 1A, 2C, pl. 1: 1–3.

1988 Rozmanaria magna Biernat and Racki ; Biernat 1988: 331, pls.1: 2, 2: 6.

1998 Leptoterorhynchus magnus ( Biernat and Racki, 1986b) ; Sartenaer 1998b: 121, text−fig. 1, pl. 1: 1–35.

2007 Rozmanaria magna (Biernat and Racki) ; Marynowski et al. 2007: 191, fig. 4.16a–c.

Material.— Four specimens from set K, ZPAL Bp 57/21–22, 37, 53 .

Description.—Exterior: see Biernat and Racki (1986a) and Sartenaer (1998b).

Ventral interior ( Fig. 4 ) with slightly thickened umbo and deeply ruffled inner surface of the muscle scars suggesting attachments of the ventral adjustors; teeth strong, stout, but short; dental plates absent, but low flanges may be interpreted as rudiments of these plates (see Fig. 4 , distance 0.9–1.5). Dorsal interior with short, divided hinge plates which are distinctly inclined medially to the floor of the valve; crural bases distinct, thickened; crura slightly divergent, proximally crescent− to boomerang−shaped in cross section, distally calceolate and ventrally curved ( Fig. 4 , distance 1.6–2.4).

Remarks.— Biernat and Racki (1986a) illustrated the internal structures of the newly described species only on photographic plates which are quite illegible, wherefore their original specimens have been redrawn using a camera lucida and redescribed by the present authors.

Stratigraphic and geographic distribution.—This species is known solely from the middle Famennian of the Kowala section.

HALAMSKI AND BALIŃSKI—LATEST FAMENNIAN BRACHIOPODS 295

Figures

Fig. 4. Transverse serial sections of Leptoterorhynchus magnus (Biernat and Racki, 1986) through shell ZPAL Bp 31/145 from Kowala, sets J–K. Numbers indicate distances in mm from ventral umbo.