Metadinophysis cf. sinensis Nie & Wang, 1941

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

Metadinophysis cf. sinensis Nie & Wang, 1941

Figure 3C

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); Mixing Zone Station 2, 14°04′ 52″S, 038°59′12″W, X.2006 (HUESC 24043).

Small to medium-sized cells, small epitheca, and laterally flattened hypotheca prolonged by a acute extension in the antapex. CL: 36.46–45 μm (39.84 ± 4.54 μm), TL: 42.23–48.23 μm (44.27 ± 3.43 μm), CW: 19.76–24.11 μm (21.29 ± 2.45 μm), TW: 24.11–29.41 μm (25.97 ± 2.98 μm), R1–R2: 4.38–5.88 μm (5.08 ± 0.75 mm), R2–R3: 9.76–11.76 μm (11.09 ± 1.15 μm) (n = 3)

Taxonomic remarks: this species is characterized by a slight slant of the epitheca and cingulum and by a flexion of the sagittal plane (the one containing the dorsoventral axis). As we do not show accurately all diacritical features of this species due its rarity in the samples, we prefer to treat it as Metadinophysis cf. sinensis .

Distribution in Brazil: Metadinophysis sinensis has been reported to Camamu Bay (Affe et al. in press).