Chætifera (ARMATA, ECHIUROIDEA)

Gephyrean worms, having a terminal anus and two strong, ventral hooks. The præoral lobe is developed into a proboscis, which is long and forked in Bonellia. The larva shows segmentation of the body. The male Bonellia is a small Planarian-like organism, parasitic in the oviducts of the female. Thala ema lives in Echinoids. Mucor in i . Chætocladieæ. Small family of Fungi of the order Chæto derma. See I SO PLEURA.