The Divine Mother Goddess Kali is known as Maha Kali, Nitya Kali, Smashana Kali, Raksha Kali, and Shyama Kali, Maha Kali and Nitya Kali. When there were neither the creation, nor the sun, the moon, the planets, and the earth, and when darkness was enveloped in darkness, then the Mother, the Formless One, Maha Kali, the Great Power, was one with Maha Kala, The Absolute.
Shyama means dark blue black. Syama Kali is yet another of Her manifestations. She is four handed, holding khadga and severed human head in upper right and lower hand respectively. The upper right and left are in varasa and varada mounting on a dead body respectively.
Shyama can be said to be just another name for Dakshinakali. Dakshina Kali mantra or Shyama Rahasya deals with Dakshinakalika worship. It confirms to dhyana of the first Mahavidya Kali. Kali Puja is also known as Shyama Puja in Bengal. In the southern tradition, Shyama Puja is Mahanisha Puja
Yogi Ananda Saraswathi