Not all bacteria are capable of causing disease, but each morphology-based group has at least some disease-causing representatives. Spirilla Bacteria: This type of bacteria is a genus of spiral-shaped bacteria that are gram-negative and flagellated. A common example for this species is Vibrio cholera, the causative agent of Cholera. The spiral bacteria are spirilla (singular form is spirillus) and the rod-shaped bacteria are bacilli (singular form is bacillus). Spirochetes . Vibrates bacteria are … This is usually a percentage of around 1-9%. Spiral-shaped bacteria are distinguished by their length, the number and size of the spirals, and direction of the coil. Spirilla (or spirillum for a single cell) are curved bacteria which can range from a gently curved shape to a corkscrew-like spiral. Spirilla – These are bacteria that are spiral with terminal flagella. Spirochetes. Spiral bacteria are another major bacterial cell morphology. Spiral shaped cells can be one of two types: either rigid called spirilla (singular spirillum) or flexible called spirochaetes (singular spirochaete). Spirochetes (also spelled spirochaete) bacteria are long, tightly coiled, spiral … Many spirilla are rigid and capable of movement. Spiral shape is one of the three primary shapes of bacteria. Bacilli – These bacteria are either in pairs of can be single and they are cylindrical in shape. The shape of the bacteria resembles a comma. Spiral-shaped bacteria can be further categorized depending in part on how much spiraling they show. Spiral bacteria, bacteria of spiral shape, form the third major morphological category of prokaryotes along with the rod-shaped bacilli and round cocci. These are the slightly curved bacteria resembling a comma shape. Short segments or incomplete spirals are common, as the comma-shaped Vibrios. Other strains of Vibrio bacteria are non-cholera strains and cause other types of illnesses. The coccus (plural form is cocci) bacteria are spherical and are usually found in clusters or chains. Spirilla have a spiral or corkscrew-like appearance. Examples are diplococcus,streptococcus, monococcus, tetracoccus and sarcina. Spirillum is microbiologically characterized as a gram-negative, motile helical cell with tufts of whiplike flagella at each end. Arrangement of Spiral Bacteria. Spirochetes are spiral bacteria having a helical shape. The genera Spirillum, Aquaspirillum, and Azospirillum are widely dispersed among and readily isolated from numerous environments. The genus Spirillum contains freshwater bacteria that are large and only require a small amount of oxygen (microaerophilic) to survive. Bacilli have a large surface area that helps them take in nutrients, but they may dry out easily. Spiral. Bacteria are known to evolve specific traits to survive in their ideal environment. These cells resemble long, twisted coils. The size of Spirillum volutans is approximately 5 – 8 micrometers wide and 60 micrometers long. These organisms are aerobic bacteria wound like helices. These are flexible and have an axial filament which helps in motility. A special group of spirilla known as spirochetes are long, slender, and flexible. 1. Spiral bacteria are twisted and commonly occur in two forms: spirillum (spirilla plural) and spirochetes. Spirillum, genus of spiral-shaped bacteria of the family Spirillaceae, aquatic except for one species (S. minus) that causes a type of rat-bite fever in man. Spiral bacteria can be sub-classified as spirilla, spirochetes, or vibrios based on the number of twists per cell, cell thickness, cell flexibility, and motility. Examples: Vibrio mytili, Vibrio anguillarum, Vibrio parahaemolyticus, Vibrio cholera. The term spirillum is used generally for any of the corkscrew-like species. Spirilla have a spiral shape, a rigid cell wall, and motility mechanisms based on polar flagella. Vibrio The three basic shapes of bacteria are spherical, rod shaped and spiral. Species S. minor is a cause of rat bite fever in humans.