Eocrinoids are among the earliest groups of echinoderms to appear, ranging from the Early Cambrian to the Silurian. This one, Gogia, is from the Middle Cambrian House Range of Utah. Despite the name ("dawn crinoids"), they are not directly ancestral to the true crinoids. Instead, various echinoderms in the Blastoidea appear to have evolved from eocrinoid ancestors; thus the Eocrinoidea is a paraphyletic or polyphyletic group.
Most eocrinoids were sessile and fed with their long brachioles (the arm-like structures, which in this specimen are spirally twisted). The body was covered by plates; in early eocrinoids the holdfast was also covered by plates, but later eocrinoids evolved a stalk with columnals, like crinoids and blastoids.