Below is what a typical coral looks like when a coral STN’s.
Shape: slightly asymmetric and has an elongated barrel-shaped posterior end usually with a blunt point. The collar region is clearly domed to form a conspicuous apical protrusion.
Color: colorless with the presence of symbiotic algae (green to yellow)
Behavior: present on the coral skeleton, slow moving, crawling around
Size: body size ranges from 150 to 280 μm.
Shape: body is laterally compressed, highly elongate with anterior neck-like region which bends towards the dorsal edge.
Behavior: moves in a slug-like fashion, contracting and extending the body, appears to search for food with the neck-like region