Dinoflagellates in tropical estuarine waters from the Maraú River, Camamu Bay, northeastern Brazil Author Nunes, Caio Ceza da Silva Author Susini-Ribeiro, Sylvia Maria Moreira Author Cavalcante, Kaoli Pereira text Check List 2019 2019-10-25 15 5 951 963 http://dx.doi.org/10.15560/15.5.951 journal article 10.15560/15.5.951 1809-127X 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 ).