Genus: Denisonodus JOHNSON & ELLIOTT, 1996
Etymology: In honor of Robert H. Denison, pioneer worker on placodemrs from the western United States.

Species: plutonensis JOHNSON & ELLIOTT, 1996
Etymology:

Locality: Mount Elden, Coconino County, Northern Arizona.

Horizon: Martin Formation.

Biostratigraphy:

Age: Frasnian Stage, Lower Late Devonian Epoch, Late Devonian.

Syntypes:

MNA P1.436: Inferognathal.

MNA V6590:

MNA V6612: Postpineal plate.

MNA V6613: Left central plate.

MNA V6614: Right paranuchal plate.

MNA V6615: Left postorbital plate.

MNA V6616: Left preorbitla plate.

MNA V6621: Marginal plate.

MNA V6623: Submarginal plate.

MNA V6625: Median dorsla plate.

MNA V6630: Dorsal fin spine.

MNA V6632: Anterior dorsolatral plate.

MNA V6647: Anterior lateral plate.

MNA V6662: Superorgnathal.

MNA V6665: Anterior median plate.

MNA V6698: Anterior ventrolateral plate.

MNAV6699: Spinal plate.

Referred material:

MNA P1.423:

MNA P1.428:

MNA P1.431:

MNA P1.432:

MNA P1.434:

MNA P1.439:

MNA P1.455:

MNA P1.456:

MNA V6575-V6577:

MNA V6585: Infreognathal:

MNA V6586-V6589:

MNA V6591-V6600:

MNA V6617: Left preorbital plate.

MNA V6618:

MNA V6619: Left preorbital plate.

MNA V6620:

MNA V6622:

MNA V6624:

MNA V6626-V6627:

MNA V6628: Median dorsal spine.

MNA V6629:

MNA V6631: Dorsl fin spine.

MNA V6633: Anterior dorsolateral plate.

MNA V6634-V6644:

MNA V6645: Anterior lateral plate.

MNA V6646:

MNA V6648: Anterior lateral plate.

MNA V6649-V6661:

MNA V6663:

MNA V6664: