Peridinium ovum, (Schiller) Balech, 1974

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 : 958

Protoperinium ovum (Schiller) Balech, 1974

Figure 7E–H

Brazil, Estuary of Maraú River: Mixing Zone Station 3, 13°57′24″S, 038°59′38″W, III.2007 (HUESC 24064), VIII.2007 (HUESC 24084); Coastal Zone Station 4, 13° 54′56″S, 038°58′57″W, X.2006 (HUESC 24045), XI. 2006 (HUESC 24049), XII.2006 (HUESC 24053), I. 2007 (HUESC 24057), II.2007 (HUESC 24061).

Ovoid cells with a small marked apical horn; cingulum ascending, not excavated; tabulation para-hexa; two long antiapical spines slightly divergent and oriented ventrally, with a well-developed left sulcal list. TL: 38.6– 57.5 (45.7 ± 10.3 μm), TW: 27.2–52.5 μm (35.7 ± 14.6 μm), EL: 9.1–15.9 μm (13.3 ± 3.7 μm), HL: 10–37.5 μm (20.4 ± 14.9 μm) (n = 3).

Distribution in Brazil: coastal regions of Bahia ( Santana 2012), Santa Catarina, and Rio grande do Sul ( Flora do Brasil 2019).