Beyrichiocopa Pokorný, 1954

Pour, Mansoureh Ghobadi, Williams, Mark, Vannier, Jean, Meidla, Tõnu & Popov, Leonid E., 2006, Ordovician ostracods from east central Iran, Acta Palaeontologica Polonica 51 (3), pp. 551-560 : 552-553

Order Beyrichiocopa Pokorný, 1954 Suborder Palaeocopa Henningsmoen, 1953a Family Ctenonotellidae Schmidt, 1941 Genus Cerninella Přibyl, 1966

Type species: Beyrichia bohemica Barrande, 1872 ; Caradocian (Upper Ordovician), Bohemia, Czech Republic .

Species included: In addition to the type species (for which see Schallreuter and Krůta 2001: 87) and Cerninella aryana sp. nov., Ogmoopsis? arcadelti Vannier, 1986b is also included in Cerninella .

Discussion.— Jones (1986: 29) considered Cerninella to be a monotypic subgenus of Piretopsis Henningsmoen, 1953b . Only one incomplete right valve of the type species of Piretopsis ( P. donsi ) was described by Henningsmoen (1953b: pl. 2: 7, 8). The lobal morphology of this specimen resembles Protallinnella Jaanusson, 1957 and Cerninella Přibyl, 1966 , but there are insufficient morphological data to determine its precise systematic position. For this reason we regard Cerninella to be of generic rank and leave its relationship to Piretopsis open, subject to additional material being recovered. Tallinnella ? bloubetinensis Jaanusson, 1957 was referred to Cerninella by Vannier (1986b) but was assigned to Brephocharieis by Schallreuter and Krůta (1994). Ogmoopsis (Quadridigitalis) siveteri Jones, 1986 is also reminiscent of Cerninella , but was assigned to Brephocharieis by Schallreuter and Krůta (1988). Material of Cerninella complicata (Salter, 1848 in Phillips and Salter 1848 sensu Přibyl 1966) was included in the new species Brephocharieis ? citrada by Schallreuter and Krůta (1988).

One of the species assigned here to Cerninella ( C. arcadelti ) has previously been referred to Ogmoopsis Hessland, 1949 , but its similarity to Cerninella was pointed out by Vannier (1986b). Cerninella differs most clearly from Ogmoopsis by having very narrow lobes (sometimes referred to as cristae), which often protrude over the dorsal margin. Cerninella arcadelti was assigned to Ogmoopsis because Sarv (1959) assigned his new species Ogmoopsis ramosa to this genus. Of the three specimens of Og. ramosa figured by Sarv (1959: pl. 17: 13–15), one is a damaged Ogmoopsis bocki ( Öpik, 1935) , in which the anterior lobe (L1) is broken and appears in its upper part like a double crista ( Sarv 1959: pl. 17: 15). Whilst the two other specimens (the holotype included) possess very narrow lobes of uniform width, three of which overreach the dorsal margin, and they may be assignable to another genus.