page_title: Phacopina
hierarchical_section_title: Phacopina
caption_attribution_description: English: A schizochroal schizochroal eye of the trilobite Phacops rana, eye dimensions 8mm across by 5.5mm high, found near Sylvania, Ohio, USA, from the Devonian
context_page_description: The Phacopina comprise a suborder of the trilobite order Phacopida. Species belonging to the Phacopina lived from the Lower Ordovician through the end of the Upper Devonian. The one unique feature that distinguishes Phacopina from all other trilobites are the very large, separately set lenses without a common cornea of the compound eye.
context_section_description: The Phacopina comprise a suborder of the trilobite order Phacopida. Species belonging to the Phacopina lived from the Lower Ordovician (Tremadocian) through the end of the Upper Devonian (Famennian). The one unique feature that distinguishes Phacopina from all other trilobites are the very large, separately set lenses without a common cornea of the compound eye.
caption: A schizochroal eye of Phacops rana, showing the large (0.5mm) individually set calcite lenses, that are unique in the animal kingdom
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