The eyes of immature holochroal Cambrian trilobites were basically miniature schizochroal eyes.
2.
Phacopida had 8 to 19 thoracic segments and are distinguishable by the expanded glabella, short or absent preglabellar area, and schizochroal ( Phacopina ) or holochroal ( Cheirurina and Calymenina ) eyes.
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