Trochiscia dimidiata Kützing, 1834: 593, pl. XVIII: fig. 75 (type locality: Nordhausen, Germany).
Anacystis dimidiata (Kützing) Drouet & Daily, 1952: 221.—Ramachandra Rao & K. Krishnamurthy, 1993: 408.
Microcystis dimidiata (Kützing) P. Silva.
INDIAN OCEAN DISTRIBUTION: India.
Note: Among numerous taxonomic synonyms cited by Drouet & Daily (1956) are Chroococcus tenax (Kirchner) Hieronymus, C. turgidus (Kützing) Nägeli, and C. turgidus var. maximus Nygaard, which are listed separately in this catalogue.