Are rotifers zooplankton?
Rotifers. The Rotifera (once known as “wheel animalcules”) are a Phylum of small (50–2000 μm), primarily freshwater zooplankton, dominated by two major groupings; the Monogononta and Bdelloidea.
Is Rotifera protist?
Rotifers are thus multicellular creatures who make make their living at the scale of unicellular protists. The name “rotifer” is derived from the Latin word meaning “wheel-bearer”; this makes reference to the crown of cilia around the mouth of the rotifer.
What is the salinity of a rotifer?
The drawback is that rotifers grown in 20-30 ppt salinity are shocked when put into fresh water. They are not killed, but they may stop swimming for a time until they adjust to the lower salinity. But there is an easy solution – grow the marine rotifers at a lower salinity (15 ppt is actually the optimum).
What do you mean by rotifer?
Definition of rotifer : any of a class (Rotifera of the phylum Aschelminthes) of minute usually microscopic but many-celled chiefly freshwater aquatic invertebrates having the anterior end modified into a retractile disk bearing circles of strong cilia that often give the appearance of rapidly revolving wheels.
What are the characteristics of phylum Chlorophyta?
Phylum Chlorophyta (Green Algae) The green algae (Fig. 2.1) are named for their green chloroplasts. They are characterized by the predominance of the green pigments (chlorophylls a and b), which mask carotenes, xanthophylls (such as lutein, zeaxanthin and siphonoxanthin), and other pigments.
Is Syndermata the sister group to Gnathostomulida?
Molecular phylogenetic analyses have suggested Syndermata is the sister group to phylum Gnathostomulida (jaw worms), forming the Gnathifera clade. This analysis, along with a separate study (which did not include gnathostomulids), placed rotifers within superphylum Lophotrochozoa, as a possible sister group to phylum Platyhelminthes (flatworms).
Is Chlorophyta unicellular or multicellular?
Chlorophyta are commonly known as green algae and sometimes, loosely, as seaweed. They grow primarily in freshwater and saltwater, although some are found on land. They may be unicellular (one cell), multicellular (many cells), colonial (a loose aggregation of cells), or coenocytic (one large cell).
What is the difference between Rhodophyta and Chlorophyta?
Chlorophyta (green algae) are present in lower ratios when compared to the Phaeophyta and Rhodophyta. The pigmentation of these species varies from yellowish green to dark green in color.