Trochozoa protostome worms (Rotifera) {rotifer} {wheel animal} (Monogononta) can be microscopic and aquatic. Rotifers have bladders, nervous systems, and flame cells. Anterior ends have spoked cilia rings.
Rotifera have same cell number {cell constant}. They cannot repair damage or grow after development finishes.
Rotifera have complete digestive tracts, including primitive stomachs {mastox}.
Rotifera have body cavity {pseudocoelom} between body wall and gut wall.
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Date Modified: 2022.0225