Mesokaryotic Cell: Definition, Features, Structure, Examples
The mesokaryotic cell is the intermediate cell of the Prokaryotic cell and the Eukaryotic cell. Dodge has first used the term mesokaryotic in 1966 for the cell that contains an…
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Viroids: Definition, Features, Structure, Examples
Viroids are the group of pathogens of some higher plants. Theodor Otto Diener introduced the viroid in 1971 for a new group of sub-viral plant pathogens. He was the first…
Prokaryotic Cell: Definition, Features, Structure, Examples
In 1957 Dougherty has divided cells into two types based on the organization in the nucleus of the cell. One is a prokaryotic cell (primitive cell) and the other is…
Echinodermata: Definition, Characteristics, Classification, Examples
Phylum Echinodermata represents the most advanced invertebrate phylum closer to the chordates. They vary substantially in size which may range from 1 cm to about 2 m in length. In…
Mollusca: Definition, Characteristics, Examples
Phylum Mollusca is the second largest invertebrate phylum containing more than 90000 described living species after phylum Arthropoda. Johnston has first coined the name Mollusca in 1650. Although Aristotle was…
Structure and Function of a Typical Bacterial Cell with Diagram
Bacteria are unicellular. Their structure is a very simple type. Bacteria are prokaryotes because they do not have a well-formed nucleus. A typical bacterial cell is structurally very similar to…
Bacteria: Definition, Characteristics, Examples
Bacteria are a type of simple, microscopic, unicellular organism. In 1675, Dutch scientist A. van Leeuwenhoek was first discovered bacteria. He proved the existence of bacteria in his own made…
Arthropoda: Definition, Characteristics, Examples
In the phylum Arthropoda, there is the most number of animal species. The phylum Arthropoda contains more than 1079290 known species like Apis, Laccifer, Millipede, Palaemon, etc. The name Arthropoda…
Annelida: Definition, Characteristics, Examples
The phylum Annelida is a group of organisms having ring-shaped segments. The term Annelida is derived from the Latin word; ” Annulus = ring “ There are more than 15000…
Aschelminthes: Definition, Characteristics, Examples
Aschelminthes is considered a superphylum, which includes many phyla. The term Aschelminthes was first introduced by Grobben in 1910. Earlier in 1859, Gegenbour was named Nemathelminthes for this phylum. So,…