Phillipsia major scale in cms CLASS - Trilobita ORDER - Ptychopariida FAMILY - Phillipsiidae GENUS/SPECIES - Phllipsia major ROCK UNIT - unknown AGE - Pennsylvanian (300 million years old) LOCALITY - Kansas City, Missouri, USA This tail segment is a uniform light gray color, but some tail segments from this trilobite species show faint color patterns, which may have been part of the original shell. A series of dark spots along the central portion of the tail were described in 1930. See another trilobite with reported color patterns. PRI 30H