Fig. 2. A in A new giant discinoid brachiopod from the Lower Devonian of Algeria

Fig. 2. A. Gigadiscina cf. collis (Clarke, 1913) from Upper Devonian of Falkland Islands, near Port Howard. External mould of ventral valve, BNMH B 60298. B. Gigadiscina sp. from Middle–Upper Devonian of Libya, Tripoli area (borehole BP, well C1−8). Ventral valve BMHN BD 3385b, external mould (B1), ventral valve BMNH BD 3385a, detail of ornament (B2), detail of microornament (B3), and detail of pitted radial bands alternating with smooth bands (B4).