Pygidium bears two pairs of small border spines between a major pair of spines. Large spine projects from occipital ring of cranidium; large genal spines. Thorax with ten segments.
Acidaspis cincinnatiensis Meek, 1873
Occurrence: Fulton, Economy, Southgate, McMicken, Mount Hope, Fairmount, Bellevue, Corryville, Mount Auburn, Waynesville
Reference: Whittington, 1956; Babcock, 1996
Includes Acidaspis anchoralis Miller, 1875, Ceratocephala ceralepta Anthony, 1838 (also referred to as Acidaspis ceralepta), and Acidaspis onealli Miller, 1875.
Occurrence: Clays Ferry
Reference: Ross, 1979