Platyhelminthes: Definition, Characteristics, Examples
In 1859 the scientist Gegenbaur proposed the name phylum platyhelminthes. Originally the animals of this group were placed in the taxon vermis by Linnaeus in 1735 along with other worms.…
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Ctenophora: Definition, Characteristics, Examples
Phylum Ctenophora and Phylum Cnidaria were in one phylum (phylum Coelenterata) in the early days. Later Coelenterata was divided into two separate phyla one is Cnidaria and the other is…
Cnidaria: Definition, Characteristics, Examples
Phylum Cnidaria is the group of multicellular animals belonging to the sub-kingdom of Enterozao. According to tissue differentiation, the animals of this group are two types diploblastic and triploblastic. In…
Porifera: Definition, Characteristics, Examples
The scientist R. Grant used the term phylum-Porifera for the first time in 1836. Phylum-Porifera belongs to the sub-kingdom Parazoa. Although all the animals of Porifera are multicellular, the cells…
Protozoa: Definition, Characteristics, Examples, Classification
In 1822, the scientist Goldfuss first used the term protozoa. Protozoa are referred to as animals whose bodies are made up of a single cell. However, it represents a division…
Respiratory Dead Space: Definition, Types, Significance, Equation
The respiratory gases are taken during normal breathing extend into two regions between the respiratory tract i.e, the conducting zone and the respiratory zone. The wall of the respiratory transport…
Archaebacteria: Definition, Characteristics, Classification
Kingdom monera are divided into two major groups. One is Archaebacteria and the other one is Eubacteria. Archaebacteria are ancient and most primitive forms of bacteria living in extreme environments.…
Cyanobacteria: Salient Features, Structure, Examples
Firstly cyanobacteria are kept in as myxophyceae of class algae (blue-green algae). Later some phycologists kept it into Cyanophyceae, while others kept it into Schizophyceae also. On the basis of…
Monera: Definition, Salient Features, Classification
Whittaker in 1969, proposed a new five Kingdom arrangement of organisms based on the complexity of cell structure, the complexity of the organism’s body, and the mode of obtaining nutrition.…