Spiral bacteria areįar too thin to be seen with the standard Brightfield microscope but are Although these twoĪre similar in shape spirochetes are flexible in nature. Typical prokaryotic cells range from 0.1 to 5.0 micrometers (m) in diameter and are significantly smaller than eukaryotic cells, which usually have diameters ranging from 10 to 100 m. (singular spirillum) and spirochetes (agent of syphilis). Spiral bacteria: They are divided into two groups, spirilla.These cells are called vibrios as in Vibrio cholera. Side by side like matchsticks (pallisade arrangement). Some form trichomes, which are similar to chains. Subtilis) or in the form of chains ( Streptobacilli). Singles or in pairs (diplobacilli, Example: Bacillus Not arranged in patterns as complex as those of cocci and mostly occur as Stumpy that they appear ovoid and are referred to as coccobacilli. Usually ranging between 1 and 10 μm in length. Bacilli are rod shaped organism (Singular, bacillus = stick).(diplococci), in groups of four (tetracocci), in clusters ( Staphylococcus), in a bead like chain ( Streptococci) or in cuboidal arrangement of cells ( Sarcinae). With the parents even after cell division. On the plane of cellular division and whether daughter cells remain together Cocci appear in several characteristic arrangements, depending.Particular species or genus but there are bacterial cells that are pleomorphic Typicalīacterial cells are spherical (called cocci), straight rods (called bacilli)Īnd helically curved rods (called spiral). The shape of a bacterium is governed by its rigid cell wall.

Bacteria shapes and sizes