Tinospora excavata was an early Eocene member of the moonseed family known from a robust, one-seeded fruit stone. Living Tinospora are climbing plants of tropical and subtropical regions, so a climbing habit is a reasonable comparison for the fossil species, although the London Clay material preserves the fruit rather than attached stems or leaves.

The endocarp formed a hard protective case around the seed and had a deeply boat-shaped form. Its surface carried fine tubercles, while a small opening on the ventral side led into the condyle region associated with the seed attachment. Modern work continues to recognise T. excavata as an important early record of this fruit type, although its exact position within the living Tinospora radiation remains uncertain.