During the polygastric phase of Sulculeolaria biloba, the leading nectophore is substantial, lacking ridges and a hydroecium. The somatocyst is short and ovoid, with a longer axis, and on the dorsal side, it exhibits a tooth-like projection that extends beyond the ostium level. There are no lateral teeth, but there is a pit-like depression at the base of the somatocyst. Both the anterior and posterior nectophores have reserve buds. There are no dorsal or lateral teeth around the ostium. The mouth-plates are lengthy and wide, divided into two separate side pieces with a raised thickened notch in the middle. The stem is long and carries numerous cormidia.