Genus: Archetheridium WANG & WANG, 2026
Etymology: Greek, arche, "beginning or origin"; for the geologically early occurrence of a new taxon and Greek, theridium, 'little beast'. A common used suffix for Cretaceous deltatheroidans.

Species: sinense WANG & WANG, 2026
Etymology: Latin, sino, "China."

Holotype: IVPP V34823

Locality: Dasanjia village, Lamadong, Jianchang City, Liaoning Province, China.

Horizon: Jiufotang Formation.

Biostratrigraphy:

Age: Aptian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material: Skull and nearly complete skeleton.