Mangrove Associated Sipunculid (Sipuncula : Phascolosomatidae) and Echiurid (Echiura: Thalassematidae) from Odisha Coast, India

The Sipuncula and Echiura form important groups of intertidal invertebrate distinguished by their members dwelling in burrowed substrata. They are found in the temporarily exposed intertidal limits to the abyssal depths of vast seas and also certain tropical estuaries of the globe. Though they are typically of marine origin but a few apparently well adapted to the estuarine environment.