As in other echinoderms, five radial furrows branch from the mouth on the animal's underside.
2.
They can be distinguished from other members of the genus by irregular patterns of cross furrows that connect the radial furrows.
3.
The radial furrows on the fossil are radial grooves on the surface of the living animal, while the three hooked ridges in central part of the fossil are imprints of cavities within the body . " Tribrachidium " was a soft-bodied benthic organism that temporarily attached ( but did not accrete ) to the substrate of its habitat ( microbial mats ).
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