Species: alocostomata DINELEY & LOEFFLER, 1976
Etymology:

Holotype: NMC 19993

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.

Paratypes:

NMC 19992: Incomplete dorsal shield.

NMC 21457: Sub-rostral surface.

NMC 21458: Ventral disc.

Referred material :

NMC 19959-19974, 19991, 19994-19999, 21340-21348:

Note: Brackish water lagoon.

_____________________________________________________________________________________
Species: thymostomata DINELEY & LOEFFLER, 1976
Etymology:

Holotype: NMC 21362

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: Incomplete dorsal shield prepared to show sub-rostral surface.

Paratype:

NMC 21361: Incomplete dorsal shield.

Referred material:

NMC 21363: Incomplete orbital plate.

Note: Mud flats by sudden floods.

_____________________________________________________________________________________
Species: helostomata DINELEY & LOEFFLER, 1976
Etymology:

Holotype: NMC 21364

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: Incomplete dorsal shield.

Paratype:

NMC 21365: Rostral fragment.

Note: Mud flats by sudden floods.