Diversity and distribution of species of the planktonic dinoflagellate genus Alexandrium (Dinophyta) from the tropical and subtropical Mexican Pacific Ocean Author Hernández-Becerril, David U. Author Pichardo-Velarde, Jorge G. Author Alonso-Rodríguez, Rosalba Author Maciel-Baltazar, Ebodio Author Morquecho, Lourdes Author Esqueda-Lara, Karina Author Barón-Campis, Sofía A. Author Quiroz-González, Nataly text Botanica Marina 2023 Warsaw, Poland 2023-11-06 66 6 539 557 http://dx.doi.org/10.1515/bot-2023-0037 journal article 10.1515/bot-2023-0037 1437-4323 11000291 3.1.4 Alexandrium leei Balech ( Figures 20 and 21 ) References: Balech 1995 , 35, pl. IV, figs 20–28, pl. V , figs 1–13; Usup et al. 2002 , 268, figs 3 A–D; Nguyen and Larsen 2004 , 97, pl. 10, figs 1–7; Tang et al. 2007 , 545, figs 1 a–I; Gu et al. 2013 , 75, figs 3 F–M; Lassus et al. 2016 , 47, pl. 6 A–D. Solitary and relatively large cells with a somewhat ovoid to spherical shape, slightly asymmetric. Epitheca conical convex, slightly shorter than epitheca, with non-prominent apical pore ( Figure 20 ). Wide cingulum and sulcus ( Figure 21 ). Chloroplasts radiating from the center ( Figure 20 ). First apical plate (1′) rhomboidal, fairly wide and elongate, with a small ventral pore ( Figure 21 ), sixth precingular plate (6″) relatively small and pentagonal ( Figure 21 ). Measurements: 50–58 μm L, 49–55 μm W (Table 1). Toxicity: this species is considered to be potentially ichthyotoxic ( Tang et al. 2007 ). Distribution: in the Gulf of Tehuantepec.