Cuneirhynchia cf. retusifrons ( Oppel, 1861 )

Vörös, A., 2014, Early Jurassic brachiopods from diverse localities of northern Anatolia (Turkey), Fragmenta Palaeontologica Hungarica 31, pp. 7-49 : 25

Cuneirhynchia cf. retusifrons ( Oppel, 1861)

(Figs 36–38)

* 1861 Rhynchonella retusifrons Opp. – OPPEL, Brachiopoden des unteren Lias, p. 544, pl. XII, fig. 5.

v 1874 Rhynchonella retusifrons, Opp. – GEMMELLARO, Zona con Terebratula Aspasia , p. 76, pl. XI, fig. 17.

v 1889 Rhynchonella retusifrons Opp. – GEYER, Hierlatz, p. 62 (pars), pl. VII, figs 8, 9, 11, 12 (non fig. 10).

1993 Cuneirhynchia retusifrons ( Oppel, 1861) – SIBLÍK, Steinplatte, p. 968, pl. 1, fig. 10.

2003 Cuneirhynchia retusifrons ( Oppel, 1861) – DULAI, Hettangian and Early Sinemurian, p. 37, pl. VI, figs 11–13.

v 2003 Cuneirhynchia retusifrons ( Oppel, 1861) – VÖRÖS et al., Schafberg, p. 72, pl. VI, figs 38–40.

2012 Cuneirhynchia retusifrons ( Oppel 1861) – HÖFLINGER, Deutsch. Lias, p. 63 + fig. (unnumbered).

2012 Cuneirhynchia cf. retusifrons ( Oppel 1861) – HÖFLINGER, Deutsch. Lias, p. 64 + fig. (unnumbered).

Material – One partly broken specimen from Kösrelik Kızığı (Ankara area), loose, from Sinemurian to Pliensbachian interval.

Measurements –

L W T Ch

INV 2014.102. ~11.0 15.4 7.8 2.3 Remarks – This species of Cuneirhynchia differs from C. palmata ( Oppel, 1861) by its low but marked, trapezoidal uniplication and more numerous but weak ribs. Our specimen has 13 ribs, 7 of which are in the uniplication. The anterior segment of the wide subtrigonal outline is truncated or even slightly concave. C. retusifrons was reported from the Sinemurian to the Pliensbachian. It is typically Alpine-Mediterranean in distribution, though HÖFLINGER (2012, l.c.) reported it from southern Germany with the notion that the extra-Alpine forms have more numerous ribs. The Turkish specimen is also densely ribbed.