Tetraselmis sp. was
chosen as our adopted microalgae that
has been cultured and monitored for their growth for several weeks (refer to practical 3). Instead,
let us introduce you all about this microalgae .
Classification:
Empire : Eukaryota
Kingdom: Plantae
Subkingdom: Viridiplantae
Infrakingdom: Chlorophyta
infrakingdom
Phylum: Chlorophyta
Subphylum : Chlorophytina
Class : Chlorodendrophyceae
Order : Chlorodendrales
Family : Chlorodendraceae
Genus :
Tetraselmis
Morphological
characteristic
Unicellular flagellates. Cells more or less compressed,
often slightly curved but never twisted. Cells cordiform, elliptical or almost
spherical. Anterior end with invagination, 4 equal flagella in 2 opposite
pairs. The cell contains a single more or less cup-shaped chloroplast (very
rarely two chloroplasts), usually with a central pyrenoid. A single eyespot is
present, located on one of the flattened sides of the cell, the position
depending on the species. Freshwater species contain two anterior contractile
vacuoles. Cell surrounded by close-fitting periplast of fused scales. The
flagella covered by square/diamond-shaped scales in 24 rows overlaid by 24
double rows of scales. Two rows of hair-shaped scales project from opposite
sides of the flagella.
Reproduction
Asexual division in the non-motile stage. In many species
one of the daughter cells inverts within the parent periplast, the 2 daughter
cells then lie in reversed positions. In the non-motile stage new walls
develop, old walls accumulating as concentric rings around the cell or being
polarized on one side, forming a stalk. The stalks may be long and occasionally
branched. Sexual reproduction unknown. Vegetative thick walled cysts known in
several species. These germinate by division into 4 cells.
The species differ in cell shape, size, presence or absence
of pyrenoids, chloroplast morphology, etc., but many of these features have
been poorly described and the taxonomy of the genus is in a state of confusion.
Examples of
species
Tetraselmis alacris
Tetraselmis apiculata
Tetraselmis arnoldii
Tetraselmis ascus
Tetraselmis
astigmatica
Tetraselmis bichlora
Tetraselmis bilobata
Tetraselmis bolosiana
Tetraselmis chui
Tetraselmis contracta
Tetraselmis convolutae
Tetraselmis cordiformis
Tetraselmis
desikacharyi
Tetraselmis elliptica
Tetraselmis fontiana
Tetraselmis gracilis
Tetraselmis hazenii
Tetraselmis
helgolandica
Tetraselmis
helgolandica
Tetraselmis
impellucida
Tetraselmis incisa
Tetraselmis
inconspicua
Tetraselmis indica
Tetraselmis levis
Tetraselmis limnetis
Tetraselmis maculata
Tetraselmis marina
Tetraselmis
mediterranea
Tetraselmis
micropapillata
Tetraselmis rubens
Tetraselmis striata
Tetraselmis
subcordiformis
Tetraselmis suecica
Tetraselmis
tetrabrachia
Tetraselmis tetrathele
Tetraselmis verrucosa
Tetraselmis verrucosa
Tetraselmis viridis
Tetraselmis
wettsteinii
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