Species: acuticosta DENISON, 1964
Etymology:

Holotype: NMC 10034

Locality: Locality R5-61, 2100’ of California Standard Company, on Alaska Highway, Mile 450, 59?7’30”N lat., 126?22’W long., about 30 miles northwest of Muncho Lake, British Columbia Province, Canada.

Horizon:

Biostratigraphy:

Age: Early Devonian.

Material: Incomplete dorsal shield.

Referred material:

FMNH PF 3703: Cast of type.
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Species: planicosta DENISON, 1964
Etymology:

Holotype: NMC 10035

Locality: Locality R5-61, 2100’ of California Standard Company, on Alaska Highway, Mile 450, 59?7’30”N lat., 126?22’W long., about 30 miles northwest of Muncho Lake, British Columbia Province, Canada.

Horizon:

Biostratigraphy:

Age: Early Devonian.

Material: Dorsal shield.

Paratype:

FMNH PF 3681: Ventral shield.

Referred material:

FMNH PF 3702: Cast of type.
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Species: amplissima DINELEY & LOEFFLER, 1976
Etymology:

Holotype: NMC 19640

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: Incomplete dorsal shield.

Referred material:

NMC 12818, 12851, 12875-12876, 12882, 1288, 12927, 12936, 13005, 13214, 19592-19594, 15956, 19663-19665, 19667-19669, 19671, 19672a, b: Isolated scales.

NMC 19621-19623, 19628, 19632-19633, 19637, 19639: Incomplete dorsal shield.

NMC 19638, 19641, 19643: Incomplete ventral shield.

NMC 19624, 19626-19627, 19630, 19634-19636, 19642, 19648-19649: Indeterminate fragment.

Note: Brackish water lagoon.

Locality: GSC 69017, 63?25’N, 128?00’W, west of Natla River, Northwest Territories, Canada.

Horizon: 38m above the base of the Delorme Formation.

Biostratigraphy:

Age: Late Silurian or Early Devonian.

Material:

NMC 19678,

NMC 19679, 19672, 19692: Incomplete dorsal shield.

NMC 19683, 19690: Indetermiante fragments.

Note: Brackish water lagoon.

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

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

Biostratigraphy:

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

Material:

NMC 19599: Isolated scale.

Note: Brakish water lagoon.

Locality: GSC 81052, exact co-ordinates unknown, 60 m from the summit of the north flak of a ridge, immediately south of GSC 69017, Northwest Territories Province, Canada.

Horizon: Delorme Formation.

Biostratigraphy:

Age: Dittonian, Lower Pragian Stage, Early Devonian.

Material:

NMC 19682: Incomplete ventral shield.

Note: Mud flats by sudden floods.

Locality: GSC 81053, exact co-ordinates unknown, 60 m from the summit of the south flak of a ridge, immediately south of GSC 69017, Northwest Territories Province, Canada.

Horizon: Delorme Formation.

Biostratigraphy:

Age: Dittonian, Lower Pragian Stage, Early Devonian.

Material:

NMC 19629: Incomplete ventral shield.

NMC 19675-19677, 19689: Incomplete dorsal shield.

NMC 19680-19681, 19684-19687: Indeterminate fragment.

Note: Mud flats by sudden floods.