Asaphida

 Species: Trilobite fossil (Isotelus gigas, MCZ 185179)  Courtesy: Museum of Comparative Zoology, Harvard University  Copyright: 2008 President and Fellows of Harvard College  Photography: Bill CrowPhotosynthImages collection

This image was created in conjunction with the "Tangible Things" exhibit at the Harvard Collection of Historical Scientific Instruments.

This image was created in conjunction with the "Tangible Things" exhibit at the Harvard Collection of Historical Scientific Instruments.

This image was created in conjunction with the "Tangible Things" exhibit at the Harvard Collection of Historical Scientific Instruments.

This image was created in conjunction with the "Tangible Things" exhibit at the Harvard Collection of Historical Scientific Instruments.

This image was created in conjunction with the "Tangible Things" exhibit at the Harvard Collection of Historical Scientific Instruments.

published in Rarest of the Rare

New York, New York, United States

AMNH, New York, New York (October 23, 2013)Xenasaphus devexuscollected in the Wolchow River, St. Petersburg, RussiaOrdovician (490-440 MYA)

New York, New York, United States