Colonies larger than about 5 mm are likely to be motile organisms. Tiny colonies are also referred to as punctiform (pin-point). The diameter of a representative colony may be measured in millimeters or described in relative terms such as pinpoint, small, medium, large. The size of the colony can be a useful characteristic for identification. Highly motile organisms swarmed over the culture media, such as Proteus spp. Common examples are entire (smooth), irregular, undulate (wavy), lobate, curled, filiform, etc.Ĭolonies that are irregular in shape and/or have irregular margins are likely to be motile organisms. Margin of bacterial colony: The margin or edge of a colony may be an important characteristic in identifying organisms. flat, raised, umbonate (having a knobby protuberance), crateriform, convex, pulvinate (cushion-shaped). These are the most common elevations e.g. This describes the “side view” of a colony. circular, irregular, filamentous, rhizoid, etc.Įlevation of the bacterial colony: It gives information about, how much does the colony rise above the agar. These forms represent the most common colony shapes you are likely to encounter. It includes form, elevation, and margin of the bacterial colony.įorm of the bacterial colony: – The form refers to the shape of the colony. 7 Some important terminologies Colony Shape.
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