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Authority

(Pavill.) Elbr. (Elbrächter, 1993: 176)

Class

Dinophyceae

Order

Peridinales

Family

Protoperidiniaceae

Basionym

Peridinium meunierii Pavill. (Pavillard, 1912: 177)

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Synonyms

Diplopeltopsis lenticula f. minor Paulsen (1907: 9, fig. 9)
Diplopeltopsis minor (Paulsen) Pavill. (Pavillard, 1913: 7)
Zygabikodinium lenticulatum Loebl. & A.R.Loebl. (Loeblich & Loeblich, 1970: 541)

Additional References

Balech (1976: 39, fig. 26), Steidinger & Tangen (1997: 530, pl. 48)

Description

Cells medium-sized, lenticular, 20–30 µm long, 40–50 µm diameter, with an almost circular cross section. Small apical horn present but no antapical horns. Apical pore well developed, bordered by 2 shoulders. Cingulum not helical, not incised, bordered by crenulate lists. Left sulcal list prominent. Cell surface covered with fine pores. Tabulation 1pa, 3', 2a, 7'', 3c, 6s?, 5''', 1'; 1' plate orthoform, small and rhombic in shape; 2a plate exceptionally large, occupying most of the apical dorsal surface.

Distribution

Southern Ocean, near South Georgia (Dodge & Priddle, 1987; Bunt & Wood, 1968); Ross Sea and Syowa Station, East Antarctica (Watanabe, 1982); cosmopolitan (Balech, 1968).

Comments

The very large antapical plate, which covers most of the hypotheca, is highly distinctive. Cysts of this species have the palaeontological name Dubridinium caperatum F.Reid (Wall & Dale, 1968).

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