Meadowtownella trentonensis scale in cms CLASS - Trilobita ORDER - Odontopleurida FAMILY - Odontopleuridae GENUS/SPECIES - Primaspis trentonensis ROCK UNIT - Rust Member, Denley Limestone, Trenton Group AGE - Middle Ordovician (465 million years old) LOCALITY - Town of Russia, New York, USA This tiny trilobite (a little less than 1 cm long) is distinctive for the many long spines along the edge of its body. PRI 41459