Home

Umezakia

Generic name: UMEZAKIA M. Watanabe, 1987. Bull. Nat. Sci. Mus., ser. B, 13(3): 81.
Synonyms:
Diagnosis:
Type species: Umezakia natans M. Watanabe 1987. - Monospecific genus
Descriptions:
Komárek (1992): Filamentous; filaments solitary, free floating, in young stages isopolar, later branched, without diversified basal parts, straight or slightly curved. Young trichomes uniseriate, isopolar, not branched, more or less constricted at cross walls, continually attenuated to the ends, with terminal cells elongated, narrow, rounded (Raphidiopsis-like stage); later stages with developing intercalar solitary heterocytes and oval akinetes, sometimes with true branching (T-type); branches initiate
by the longitudinal division of the parental cell. Sheaths fine, gelatinous,wide, hyaline, diffluent (staining !). Cells cylindricalor irregular barrel-shaped, usually longer than wide, only after intense division shorter than wide, cell content pale blue-green with gas vesicles (visible aerotopes). Heterocytes occur usually scarcely (common only in nitrogen deficient environment), spherical or oval, akinetes solitary or in short irregular rows, oval, thick-walled, widely oval up to almost spherical.
Genotype differences, molecular
data:
Reproduction strategies, life cycles, cell division:
Komárek (1992): Cells divide crosswise to the trichome axis, or longitudinally before branching. Reproduction by trichome disintegration and by akinetes.
Ultrastructure:
Taxonomic position, higher hierarchy:
Cyanophyceae, Stigonematales, Mastigocladaceae, Mastigocladoideae

Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (1992): The type species was isolated from plankton of a lake in central Japan (the planktic populations with dominant not branched trichomes can be misinterpreted with Raphidiopsis). The type culture TAC 101 is kept in Japanese algal strain collections. Umezakia is the single planktic member of Stigonematales.
Physiology and biochemistry:
Distribution, endemism, problematic
citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:

Umezakia natans M. Watanabe 1987
Keys:
List of stains:
Drawings:
Komárek 1992
Application technology:
Literature:

  2.1 taxonomy: M. Watanabe 1987, Anagnostidis & Komárek 1990, Komárek 1992
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: