Genus: Ossirarus OTOO, CLACK, & T.R. SMITHSON, in CLACK, BENNETT, CARPTNER, DAVIES, FRASER, KEARSEY, MARSHALL, MILLWARD, OTOO, REEVES, ROSS, RUTA, SMITHSON, SMITHSON, & WALSH, 2016
Etymology: Latin, ossi, "bones" and Latin, rarus, "scattered or rare."

Species: kieranorum emend CLACK, & T.R. SMITHSON, in CLACK, BENNETT, CARPTNER, DAVIES, FRASER, KEARSEY, MARSHALL, MILLWARD, OTOO, REEVES, ROSS, RUTA, SMITHSON, SMITHSON, & WALSH, 2016
Note: The authors incorrectly coined the species name, because it was named after two people the ending should be -orum, not -i.
Etymology: In honor of O. Kieran, and B. Kieran, representing the Burnmouth community, who have supported us and encouraged local interest and cooperation.
= Ossirarus kierani CLACK, & T.R. SMITHSON, in CLACK, BENNETT, CARPTNER, DAVIES, FRASER, KEARSEY, MARSHALL, MILLWARD, OTOO, REEVES, ROSS, RUTA, SMITHSON, SMITHSON, & WALSH, 2016

Holotype: UMZC 2016.3

Locality: Burnmouth Ross end cliffs, East Kirkton, near Bathgate, West Lothian Province, Scotland.

Horizon: 340.5 m above the base of the Ballagana Formation.

Biostratigraphy:

Age: Mid-Tournaisian Epoch, earliest Mississippian Sub-Epoch (North America), earliest Carboniferous.

Material: Partial skull and scattered postcrania visible only in micro-CT scan.