The largest bacteria which can be visible by unaided eye is_______

Bacterial taxonomy is the classification of bacteria into hierarchies of similarity. It involves the classification, nomenclature, and identification of microorganisms.  Bacteria are microscopic, single-celled organisms that can be found in almost every environment on Earth. They can exist as single cells, in pairs, chains, or clusters.  Bacteria are traditionally classified based on their Gram-staining response into gram-positive and gram-negative bacteria. Gram-positive bacteria have one membrane and are also known as monoderm bacteria. Gram-negative bacteria have two membranes and are... Show more

Bacterial taxonomy is the classification of bacteria into hierarchies of similarity. It involves the classification, nomenclature, and identification of microorganisms. 
Bacteria are microscopic, single-celled organisms that can be found in almost every environment on Earth. They can exist as single cells, in pairs, chains, or clusters. 
Bacteria are traditionally classified based on their Gram-staining response into gram-positive and gram-negative bacteria. Gram-positive bacteria have one membrane and are also known as monoderm bacteria. Gram-negative bacteria have two membranes and are also known as diderm bacteria. 

Bacteria are also classified into five groups based on their basic shapes:
Spherical: (cocci)
Rod: (bacilli)
Spiral: (spirilla)
Comma: (vibrios)
Corkscrew: (spirochaetes) 

Modern bacterial taxonomy is polyphasic. This means it is based on several molecular techniques, each one retrieving information at different cellular levels. The results are combined and analyzed to reach a "consensus taxonomy" of a microorganism. 

The ideal means of identifying and classifying bacteria would be to compare each gene sequence in a given strain with the gene sequences for every known species.

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