Sigalionidae are commonly found on soft bottom.

   Body form is elongated, quadrangular or flattened. Scale present.

Prostomium

1-3 antennae present. 

A pair of palps present.

1-2 pairs of eyes. Four jaws present at the mouth.

Scale

Marginally fringed elytrae alternate with dorsal cirri on anterior setigers

Scale                                    Scale

Scale

Parapodia and setae

Parapodia are biramous. 

Neurosetae are composite and notosetae are simple.

   Parapodia biramous             Falcigerous setae

                                           with bidentate hooked