Jakubirhynchia, Tomasovych, 2006

Vörös, A., 2014, Early Jurassic brachiopods from diverse localities of northern Anatolia (Turkey), Fragmenta Palaeontologica Hungarica 31, pp. 7-49 : 15

Jakubirhynchia ? cf. fascicostata ( Uhlig, 1880)

( Figs 2–4 )

v *1880 Rhynchonella fascicostata n. f. – UHLIG, Sospirolo, p. 42, pl. V, figs 1–3.

v 2009 Jakubirhynchia ? cf. fascicostata ( Uhlig, 1880) – VÖRÖS, Bakony, p. 63, pl. VIII, figs 12, 13 (cum syn.).

Material – Two moderately preserved specimens from Yakacik and Alacaatlı (Ankara area), Pliensbachian.

Measurements –

L W T Ch

INV 2014.92. 10.5 11.6 5.4 2.2 Remarks – This small and rather flat rhynchonellid species was thoroughly discussed recently by VÖRÖS (2009) and was placed tentatively to the genus Jakubirhynchia . The present material did not allow investigation of the internal features; therefore, this tentative generic attribution is accepted here. J. fascicostata is very easy to separate from other rhynchonellids because it is entirely and finely ribbed and the bifurcate ribs appear in bundles posteriorly. J. fascicostata is widespread in the Sinemurian and Pliensbachian of the Alpine-Mediterranean region and now it is recorded from northern Anatolia.

Figures

Figs 2–4. Jakubirhynchia? cf. fascicostata (Uhlig, 1880), INV 2014.92., Yakacik, Pliensbachian, 2 = dorsal view, 3 = anterior view, 4 = lateral view. – Figs 5–7. Cirpa fronto (Quenstedt, 1871), INV 2014.93., Kösrelik Kızığı, loose, from Sinemurian to Pliensbachian interval, 5 = dorsal view, 6 = anterior view, 7 = lateral view. – Figs 8–10. Cirpa borissiaki (Moisseiev, 1926), INV 2014.94., Alacaatlı, Pliensbachian, 8 = dorsal view, 9 = anterior view, 10 = lateral view. – Figs 11–13. Prionorhynchia? flabellum (Gemmellaro, 1874), INV 2014.95., Yakacik, Pliensbachian, 11 = dorsal view, 12 = anterior view, 13 = lateral view. – Figs 14–16. Cirpa kiragliae Ager, 1959, INV 2014.96., Kösrelik Kızığı, loose, from Sinemurian to Pliensbachian interval, 14 = dorsal view, 15 = anterior view, 16 = lateral view. – Figs 17–20. Cirpa alkayae sp. n., holotype: PAL 2014.137., Beytepe, Pliensbachian, 17 = dorsal view, 18 = anterior view, 19 = lateral view, 20 = posterior view. – Figs 21–22. Cirpa alkayae sp. n., INV 2014.97., Beytepe, Pliensbachian, incomplete specimen with two folds in the uniplication, 21 = ventral view, 22 = lateral view. (All figures are in natural size. Speci- mens have been coated with ammonium chloride before photography.)