Genus: Hyloplesion FRITSCH, 1883
Etymology:
= Orthocosta FRITSCH, 1883
Etymology:
= Orthopleurosaurus LYDEKKER, 1890
Etymology:
= Seeleya FRITSCH, 1883
Etymology:
= Stelliosaurus FRITSCH, 1875 non JOURDAN, 1862 (Stelliosaurus, Squamata, Sphenodontidae)
Etymology:

Species: longicostatum (FRITSCH, 1875) FRITSCH, 1883
Etymology:
= Stelliosaurus longicostatus FRITSCH, 1875

Lectotype: CGH 15

Locality: Nyrany (Nurschan), Plzen Basin, Bohemia, Czech Republic.

Horizon: Gaskohl.

Biostratigraphy:

Age: Upper Westphalian D, Lower Upper Silesian Series, Desmoniensean, Upper Myachkovskian Stage, Upper Moscovian Epoch, Late Carboniferous (Late Pennsylvanian).

Material: Counterpart blocks of trunk and anterior caudal region.

Galvanotype:

CGH 16: Fragmentary skeleton.

CGH 247, CGH 248, 249, 3023: Fragmentary skeletons.

RSM 1899.32.3: Skull and skeleton.

Electrotype:

BMNH R372: Fragmentary skeleton.

BMNH R373: Fragmentary skeleton.

Referred material:

= Seeleya pusilla FRITSCH, 1883
Etymology:

Holotype: CGH 3

Locality: Nyrany (Nurschan), Plzen Basin, Bohemia, Czech Republic.

Horizon: Gaskohl.

Biostratigraphy:

Age: Upper Westphalian D, Lower Upper Silesian Series, Desmoniensean, Upper Myachkovskian Stage, Upper Moscovian Epoch, Late Carboniferous (Late Pennsylvanian).

Material: Fragmentary skull and skeleton.

Electrotype: BMNH R343: Skull and skeleton.

 

= Orthocosta microscopica FRITSCH, 1883
Etymology:
= Orthopleurosaurus microscopicus (FRITSCH, 1883) LYDEKKER, 1890

Holotype: CGH 45

Locality: Tremosna, Czech Republic.

Horizon:

Biostratigraphy:

Age: Middle Pennsylvanian.

Material: Trunk, rear limbs and tail.

Galvanotyep:

CGH 233: Skeleton.

Electrotype:

BMNH R349: Anterior portion of a skeleton.