The two major genera of gram-positive bacteria include the , which contains the endospore-forming genera (e. g., bacillus and clostridium), and the which contains some filamentous forms (e. g., streptomyces) that produce exospores.

The two major genera of gram positive bacteria include the Bacilli , which contain the endospore-forming genera (e.g. Bacillus and Clostridium) , and the Cocci , which contains some filamentous (e.g. Streptomyces) that produce exospores.

Explanation:

The two main genera of Gram positive bacteria include:

1) Bacilli (Bacillus) : It is a group of cylindrical or rod shaped gram positive anaerobic or aerobic (some condition) bacteria found in water and soil. Bacillus bacteria can be subdivided on their ability to form spores.

2) Cocci (Coccus) : It is a type of bacterium that have a spherical, ovoid and round shape anaerobic gram positive bacteria.    

the fossil record provides evidence of a common ancestor to many species.

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