Alexandrium tamarense (Lebour) Balech

Hernández-Becerril, David U., Pichardo-Velarde, Jorge G., Alonso-Rodríguez, Rosalba, Maciel-Baltazar, Ebodio, Morquecho, Lourdes, Esqueda-Lara, Karina, Barón-Campis, Sofía A. & Quiroz-González, Nataly, 2023, Diversity and distribution of species of the planktonic dinoflagellate genus Alexandrium (Dinophyta) from the tropical and subtropical Mexican Pacific Ocean, Botanica Marina (Warsaw, Poland) 66 (6), pp. 539-557 : 547

publication ID

https://doi.org/ 10.1515/bot-2023-0037

DOI

https://doi.org/10.5281/zenodo.11000330

persistent identifier

https://treatment.plazi.org/id/03E50944-FFBF-2A11-4EB6-E178FE8CFCBC

treatment provided by

Felipe

scientific name

Alexandrium tamarense (Lebour) Balech
status

 

3.1.9 Alexandrium tamarense (Lebour) Balech ( Figures 44–52 View Figures 44–52 )

References: Hallegraeff et al. 1991, 582, figs 33–42; Balech 1995, 38, pl. VI, figs 1–40, pl. VII, figs 1–9; Usup et al. 2002, 270, figs 5 A–E; Nguyen and Larsen 2004, 104, pl. 14, figs 1–5; Gu et al. 2013, 75, figs 4 E–I; Fabro et al. 2017, p. 1210, figs 1 A–M.

Cells usually solitary, but cells in couples were also found. Cells relatively small, irregularly pentagonal in shape, with the epitheca slightly larger than the hypotheca ( Figure 44 View Figures 44–52 ), with not pronounced shoulders ( Figure 45 View Figures 44–52 ), wide and excavated cingulum ( Figure 46 View Figures 44–52 ), and central nucleus ( Figure 44 View Figures 44–52 ). The first apical plate (1′) is connected with Po ( Figures 45, 47, 50–52 View Figures 44–52 ), widely rhomboid in shape ( Figures 45 and 51 View Figures 44–52 ), with a ventral pore ( Figures 50–52 View Figures 44–52 ), whereas 2′, 3′ and 4′ are larger plates ( Figure 51 View Figures 44–52 ), and plate 6″ is relatively small and pentagonal ( Figures 46 and 50 View Figures 44–52 ). Po is elongate, more rectangular and comma-shaped, with no pore ( Figures 50–52 View Figures 44–52 ). The posterior sulcal plate (Sp) is wide and pentagonal, with a conspicuous pore ( Figures 48 and 49 View Figures 44–52 ).

Measurements: 26–35 μm L, 28–36 μm W (Table 1).

Toxicity: this species may produce toxins associated to PSP ( Lugliè et al. 2017).

Distribution: in the southern Mexican Pacific, including the Gulf of Tehuantepec.

Remarks: All morphological characters examined led us to identify this species as A. tamarense . However, the fact that species of the “ A. tamarense complex” cannot be distinguished based on morphology alone and that molecular assays are required for reliable identification ( Litaker et al. 2018), puts us in a difficult situation, and it is recommended to consider Alexandrium pacificum Litaker as the prevalent species of that complex in the Pacific Ocean. See Discussion.

VI

Mykotektet, National Veterinary Institute

PSP

Parasitic Seed Plants

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