Shakti Ganapathi is the 5th form among 32 forms of Lord Ganesha. He is depicted with 4 arms (Chaturbhuja Ganapathi). Shakti Ganapati is not mentioned in 21 types of Ganesha (Ekavimsathi Ganapathi) & in 16 types of Ganesha (Shodasha Ganapati).
Shakti Ganapathi is the most powerful form among all forms of Ganesha. This form of Ganapati is part of Tantric worship.
Shakti Ganapathi Dhyanam: Shakthi Ganesha Mantram
Alingya deveem haritham nishnnaam
Parasparaa shlishtaka thee nivesham
Sandhya runam pashasrunim vahastham
Bhayapaham shakti ganesha meede
Appearance & Iconography of Shakti Ganapathi
Holding the green-coloured Shakti, Shakti Ganapati is depicted as being the colour of the sky at sunset. He appears with a noose in one hand, a garland of flowers in another and one hand in the abhaya mudra, offering blessing to his devotees.
Worship
Shakti Ganapati is worshipped in Tantric form of worship.
Shakti Ganapathi Dhyana Mantra