Species: mackenziei DINELEY & LOEFFLER, 1976
Etymology: In of Alexander Maxkenzie, and early explorer of the Canadian North West.

Holotype: NMC 19673

Locality: GSC 69014, 62°33’N, 127°45’W, south-west limb of the Grizzly Bear anticline, Northwest Territories Province, Canada.

Horizon: 260m above the top of the Whittaker Formation, in transitional facies between the Delorme and Road River Formations.

Biostratigraphy:

Age: Early Dittonian, Lower Pragian Stage, Early Devonian.

Material: An almost complete, articulated specimen.

Paratypes:

NMC 19507: Dorsal shield.

NMC 19553, 19562: Ventral shields.

NMC 19651: Articulated headshields nd body scales with branchial plate and sub-branchial plate.

Referred material:

NMC 13213, 19502, 19506, 19511, 19514, 19517, 19520a, 19562, 19528-19531, 19535, 19538, 19546-19548, 19559, 19695b, 1966b-d, 19762: Dorsal shields.

NMC 13815, 13190-13915, 13201-13208, 13210, 19563-19564, 19571, 19574-19575, 19583-19584, 19604, 19609-19610, 19615, 19620, 19650, 19657: Articulated specimens mainly scales.

NMC 19520b, 19565, 19607, 19617-18618, 19662a, 19763: Isolated ventral shields.

NMC 13217, 19576, 21499: 3 blocks with isolated scales.

Note: Brackish water lagoon.

GREENIAUS & WILSON, 2003

UALVP 45091: Juvenile specimen.

Locality: GSC 81051, Exact co-ordinates unknown, Broken Skull River, Northwest Territories Province, Canada.

Horizon: Whittaker Formation, in transitional facies between the Delorme and Road River Formations.

Biostratigraphy:

Age: Early Dittonian, Lower Pragian Stage, Early Devonian.

Material:

Paratype:

NMC 13212: Dorsal shield.

Referred material:

NMC 19551, 19607: Isolated ventral shields.

NMC 19508, 19579, 19659b: Dorsal shield.

NMC 19659a: Block with isolated scales.

Note: Brakish water lagoon.