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Table 2 Morphological comparison of the brackish water Peridiniopsis species

From: Taxonomic characterization of a brackish water, bloom-forming Peridiniopsis species (Peridiniales, Dinophyceae) from Iraq

  P. minima a P. minima b P. salina c P. cristata var. cristata d,e,f,g P. cristata var. boliviensis h P. cristata var. tubulifera h
Cell shape oval to rhombic pentagonal to rhombic oval to spherical pyriform ovoid to subspherical pyriform
Length (μm) 13.5–19.04 8–15 9.1–14.5 (37) 43–61 32–40 (27) 30–40
Width (μm) 12.8–17.9 6–12 7.3–12.9 29–41 30–38 26–32
Theca ornamentation smooth smooth smooth verrucose to reticulate finely reticulated smooth
Epitheca broadly conical, equal to hypotheca broadly conical, equal to hypotheca broadly conical, equal to hypotheca helmet-shaped, higher than hypotheca broadly conical, equal to hypotheca helmet-shaped, higher than hypotheca
Plate tabulation Po, X, 3′, 1a, 6″, 5c, 5 s, 5′′′, 2′′′′ Po, X, 3′, 1a, 6″, 5c, 4 s?, 5′′′, 2′′′′ Po, X, 4′, 1a, 6″, 6c, 5 s, 5′′′, 2′′′′ Po, X?, 3′, 1a, 6″, 6c, 4-5 s?, 5′′′, 2′′′′ Po, X?, 3′, 1a, 6″, ?c, ?s, 5′′′, 2′′′′ Po, X, 3′, 1a, 6″, 6c, 5 s, 5′′′, 2′′′′
Intercalary plate small, rhombic small, rhombic small, rhombic large, hexagonal large, hexagonal large, hexagonal
Intercalary plate location dorsally between 2′, 3′, 3′′and 4′′ dorsally between 2′, 3′, 3′′and 4′′ laterally between 2′, 3′, 2′′and 3′′ dorsally between 2′, 3′, 2′′, 3′′, 4′′ and 5′′ dorsally between 2′, 3′, 2′′, 3′′, 4′′ and 5′′ dorsally between 2′, 3′, 2′′, 3′′, 4′′ and 5′′
Apical spine no no no small dorsal membranous crest absent or tiny dorsal membranous crest no
Antapical spine no no no membranous crest-shaped extension membranous crest-shaped extension no
Eyespot yes yes no no no yes
Endosymbiont yes yes ? ? ? ?
Habitat (salinity range) brackish waters (2-7.2) fresh water rivers brackish waters (2.2-16.2) brackish waters (4.35-5.76; 3-77) brackish waters (7.5) brackish waters (5.7)
  1. a – this study; b – Zhang et al. 2014; c – Trigueros 2000; d – Balech 1961; e – Ricard and Bourrelly 1982; f – Couté et al. 2012; g – Mendoza & Baylon 2014; h – Iltis and Couté 1984; ? – no information