Anabaena

Anabaena is in the prokarya domain because it has no true nucleus and no membrane bound organelles.

This is the phylum of bacteria that acquire their energy through photosynthesis, and are often called the blue-green algae.

Anabaena fall into this category because they have trichomes and lack endospores and exospores.

This is the category of blue-green algae that form heterocysts and have unbranched trichomes.

 The Anabaena genus is known for its intercalary heterocysts and isolated or amorphous filaments.

A Strmatolite from early cyanobacteria.

Here are some phylogenetic trees that show where Anabaena fits in with the bacteria, and where it fits in with its own family.