Ornithocercus magnificus Stein, 1883

Nunes, Caio Ceza da Silva, Susini-Ribeiro, Sylvia Maria Moreira & Cavalcante, Kaoli Pereira, 2019, Dinoflagellates in tropical estuarine waters from the Maraú River, Camamu Bay, northeastern Brazil, Check List 15 (5), pp. 951-963 : 956

Ornithocercus magnificus Stein, 1883

Figure 3D

Brazil, estuary of Maraú River: River Zone Station 1, 14°06′33″S, 039°02′48″W, II.2007 (HUESC 24058).

Large cells, subcircular body in lateral view, with epiteca very reduced, cingular lists well-developed and supported by rays and other short segments, thecal surface ornamented by small pores and alveoli, left sulcal list extend from ventral to dorsal margin of the cell, with three well-marked lobes supported by five large ribs. CL: 37.5 μ m, TL: 87.5 μm, CW: 42.5 μm, LT: 87.5 μm, ACL: 67.5 μm, PCL: 67.5 μm, LSL: 25 μm (n = 1).

Taxonomic remarks: this species can be distinguished from O. thumii (Schmidt) Kofoid & Skogsberg by its smaller size and the structure of the lists, which are more developed in O. thumii ( Balech 1988) .

Distribution in Brazil: coastal regions of Amapá, Ceará, and Rio Grande do Norte; along the eastern, southeastern, and southern coasts ( Flora do Brasil 2019).