Genus: Arcantiodelphys VULLO, GHERRBRANT MUIZON & NERAUDEAU, 2009
Etymology: Latin, the name of the Gallo-Roman domain from which the village of Archingeay developed, and Greek, delphys, "opossum"; the term used for marsupials.

Species: marchandorum emend VULLO, GHERRBRANT MUIZON & NERAUDEAU, 2009
Etymology: In honor of Joseph Marchand, who sorted part of the material and discovered the holotype, and the Marchand family, owner of the Font-de-Benon quarry.
= Acantiodelphys marchandi VULLO, GHERRBRANT MUIZON & NERAUDEAU, 2009

Holotype: MNHN CCH4

Locality: Font-de-Benon Quarry, Archingeay-Les Nouillers, Charente-Maritime Province, southwestern France.

Biostratigraphy:

Age: Cenomanian Stage, Upper Gallic Subepoch, Lowermost Gulf Epoch, Middle Cretaceous.

Material: Right upper (anterior?) molar, possibly an anterior one, with mesial part broken.

Referred material:

MNHN CCH1: Trigonid of left lower molar, m1.

MNHN CCH2: Talonid of right lower molar.

MNHN CCH3: Trigonid of right lower moloar, m2 or more posterior molar.