Table 1 Comparison of the morphological characteristics of six Glaucocystis species delineated in the present study.
Species | G. oocystiformis Prescott | G. geitleri sp. nov. a | G. incrassata stat. nov. a | G. bhattacharyae sp. nov. a | G. miyajii sp. nov. a | G. nostochinearum Itzigs. ex Rabenh. a |
|---|---|---|---|---|---|---|
Mother cell wall extension | prominent | prominent | not prominent | not prominent | not prominent | not prominent |
Gauze fabric-like appearance of mother cell wall | present | present | absent | absent | present | present |
Cell numbers within a colony | 2–4, generally 4 | 2–4, generally 2 | 4–8, generally 4 | 1–4, generally 4 | 2–4, generally 4 | 2–4, generally 4 |
Cell size | ca. 15–25 μm wide × ca. 25–35 μm long | ca. 20–30 μm wide × ca. 30–40 μm long | ca. 13–23 μm wide × ca. 20–30 μm long | ca. 12–22 μm wide × ca. 17–27 μm long | ca. 10–15 μm wide × ca. 19–24 μm long | ca. 10–17 μm wide × ca. 18–27 μm long |
Cell and polar shape | ellipsoidal with polar nodule | truncate-ellipsoidal with polar thickening | truncate-ellipsoidal with polar thickening | truncate-ellipsoidal without polar thickening | ellipsoidal without polar nodule | ellipsoidal without polar nodule |
Cell wall thickness | ca. 150–350 nm | ca. 300–500 nm | ca. 100–300 nm | ca. 150–350 nm | ca. 150–350 nm | ca. 100–300 nm |
Protoplast periphery b | type A | type A | type C | type C | type C | type B |
Regular groove | present | present | present | present | present | absent |
Groove interval | ca. 500–800 nm | ca. 500–800 nm | ca. 200–600 nm | ca. 200–600 nm | ca. 200–600 nm | ND |
Vesicle frequent overlapping | present | present | absent | absent | absent | present |
Authentic strain | 126 | SAG 229-1 | SAG 229-2 | 118 | Thu10 | SAG 16.98 |
Other strains examined | NIES-1369, NIES-966 | SAG 229-3, SAG 28.80 | Â | SAG 27.80 | NIES-1961 | SAG 45.88 |
Corresponding phylogenetic group resolved in previous study31 | G4 | G1 | G6 | G5 | G3 | G2 |
