Iodes corniculata was an early Eocene member of a genus that still lives in tropical regions today. Its small fruit stone is broadly ovate and laterally compressed, with a relatively orderly ridge network enclosing around 15–20 shallow areoles. One of its most striking features is at the apex: the stylar region is flanked by a horn-like projection on each lateral face.

Internal anatomy strengthens the identification. The marginal vascular bundle is embedded within the endocarp wall and the seed cavity has a papillate lining, both characteristic of Iodes-type construction. Living Iodes are climbers, but the London Clay fossil is an isolated fruit organ, so the growth habit of the individual plant is inferred from living relatives rather than directly preserved. The combination of paired apical horns and a mostly closed ridge network makes this one of the more distinctive London Clay Iodes stones when complete.