mesenterial

Competition between corals is known to involve mesenterial filaments, sweeper tentacles and nematocysts

PLoS ONE Alerts: New Articles Katie Barott et al. 2009

The outermost layer becomes the investing skin-tube of the embryo; the layer for the nervous system forms the tubular rudiment of the brain and spinal cord; the mucous layer curls round to form the alimentary tube; the muscle layer grows upwards and downwards to form the fleshy and osseous tube of the body wall; even the vessel layer forms a tube investing the alimentary canal, but a part of it goes to form the medial "Gekröse," or mesenterial complex, which departs considerably from the tubular form.

Form and Function A Contribution to the History of Animal Morphology

A) Active coral interaction zone where one coral is attacking another and damaging the tissue with mesenterial filaments.

PLoS ONE Alerts: New Articles Katie Barott et al. 2009