Bacterial cellular morphologies

morphologyrodcell shapecoccusmorphological categoryrod-shaped bacteriashape
Bacteria and Archaea are classified by direct examination with the light microscope according to their morphology and arrangement.wikipedia
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Spiral bacteria

spirillumspiralspiral-shaped
Spiral bacteria are another major bacterial cell morphology.
Spiral bacteria, bacteria of spiral (helical) shape, form the third major morphological category of prokaryotes along with the rod-shaped bacilli and round cocci.

Bacterial morphological plasticity

spores
Bacterial morphological plasticity refers to changes in the shape and size that bacterial cells undergo when they encounter stressful environments.

Archaea

archaeonarcheaarchaebacteria
Bacteria and Archaea are classified by direct examination with the light microscope according to their morphology and arrangement.

Optical microscope

light microscopeoptical microscopycompound microscope
Bacteria and Archaea are classified by direct examination with the light microscope according to their morphology and arrangement.

Haloquadratum

Haloquadratum walsbyiHaloquadraSquare Haloarchaeon of Walsby
But there may be others such as helically twisted cylinders (spirochetes), cylinders curved in one plane (selenomonads) and unusual morphologies (such as the square, flat box-shaped cells of the archaean genus Haloquadratum).

Microorganism

microorganismsmicrobemicrobes
A coccus (plural cocci, from the Latin coccinus (scarlet) and derived from the Greek kokkos (berry)) is any microorganism (usually bacteria) whose overall shape is spherical or nearly spherical.

Sphere

sphericalhemisphereglobose
A coccus (plural cocci, from the Latin coccinus (scarlet) and derived from the Greek kokkos (berry)) is any microorganism (usually bacteria) whose overall shape is spherical or nearly spherical.

Foodborne illness

food poisoningptomaineptomaine poisoning
Important human diseases caused by coccoid bacteria include staphylococcal infections, some types of food poisoning, some urinary tract infections, toxic shock syndrome, gonorrhea, as well as some forms of meningitis, throat infections, pneumonias, and sinusitis.

Urinary tract infection

cystitisurinary tract infectionsbladder infection
Important human diseases caused by coccoid bacteria include staphylococcal infections, some types of food poisoning, some urinary tract infections, toxic shock syndrome, gonorrhea, as well as some forms of meningitis, throat infections, pneumonias, and sinusitis.

Toxic shock syndrome

toxic shockStreptococcal toxic shock syndromeendotoxic shock
Important human diseases caused by coccoid bacteria include staphylococcal infections, some types of food poisoning, some urinary tract infections, toxic shock syndrome, gonorrhea, as well as some forms of meningitis, throat infections, pneumonias, and sinusitis.

Gonorrhea

gonorrhoeathe clapgonorhea
Important human diseases caused by coccoid bacteria include staphylococcal infections, some types of food poisoning, some urinary tract infections, toxic shock syndrome, gonorrhea, as well as some forms of meningitis, throat infections, pneumonias, and sinusitis.

Meningitis

spinal meningitisbacterial meningitiscerebral meningitis
Important human diseases caused by coccoid bacteria include staphylococcal infections, some types of food poisoning, some urinary tract infections, toxic shock syndrome, gonorrhea, as well as some forms of meningitis, throat infections, pneumonias, and sinusitis.

Pneumonia

bronchopneumoniabronchial pneumoniaNecrotizing pneumonia
Important human diseases caused by coccoid bacteria include staphylococcal infections, some types of food poisoning, some urinary tract infections, toxic shock syndrome, gonorrhea, as well as some forms of meningitis, throat infections, pneumonias, and sinusitis.

Sinusitis

sinus infectionrhinosinusitischronic sinusitis
Important human diseases caused by coccoid bacteria include staphylococcal infections, some types of food poisoning, some urinary tract infections, toxic shock syndrome, gonorrhea, as well as some forms of meningitis, throat infections, pneumonias, and sinusitis.

Tetrad

Staphylococcus

staphylococcistaphylococcalstaph
Important human diseases caused by coccoid bacteria include staphylococcal infections, some types of food poisoning, some urinary tract infections, toxic shock syndrome, gonorrhea, as well as some forms of meningitis, throat infections, pneumonias, and sinusitis.

Bacillus (shape)

rod-shapedrodsbacillus
Describing a bacterium as a coccus, or sphere, distinguishes it from bacillus, or rod.

Bacteria

bacteriumbacterialEubacteria
Bacteria and Archaea are classified by direct examination with the light microscope according to their morphology and arrangement. A coccus (plural cocci, from the Latin coccinus (scarlet) and derived from the Greek kokkos (berry)) is any microorganism (usually bacteria) whose overall shape is spherical or nearly spherical.