Pyrophacus horologium 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 : 959-960

Pyrophacus horologium Stein, 1883

Figure 8F, G

Brazil, Estuary of Maraú River: River Zone Station 1, 14°06′33″S, 039°02′48″W, X.2006 (HUESC 24042), XI.2006 (HUESC 24046), I.2007 (HUESC 24054); Mixing Zone Station 2, 14°04′52″S, 038°59′12″W, X.2006 (HUESC 24043), XI.2006 (HUESC 24047), I.2007 (HUESC 24055), II.2007 (HUESC 24059), III.2007

(HUESC 24063); Mixing Zone Station 3, 13°57′24″S, 038°59′38″W, IX.2006 (HUESC 24040), X.2006 (HUESC 24044), XI.2006 (HUESC 24048), XII.2006 (HUESC 24052), I.2007 (HUESC 24056), III.2007 (HUESC 24064), IV.2007 (HUESC 24068), V.2007 (HUESC 24072); Coastal Zone Station 4, 13°54′56″S, 038° 58′57″W, X.2006 (HUESC 24045), XII.2006 (HUESC 24053), I.2007 (HUESC 24057), II.2007 (HUESC 24061), IV.2007 (HUESC 24069).

Cells apically flattened, lenticular, showing typical apical pore; epitheca showing five apical and nine pre-cingular plates; hypotheca with nine post-cingular, three antapical, and one posterior intercalar plates. CW: 60–100 μm (71.9 ± 11.20 μm) (n = 38).

Distribution in Brazil: coastal regions of Pará; along the northeastern, eastern, southeastern and southern coasts ( Flora do Brasil 2019).