Trilobite fossil RARE PHACOPIDA "LENS-FACE" ordorvician 7 fossils per winner

Description

Each winner will receive 7 fossils scooped from the Phacopida fossils as pictured.Phacopida ("Lens-face") is an order of trilobite that lived from the Ordovician to the Devonian.The origin of the Phacopida order is uncertain. It comprises three sub orders (Phacopina, Calymenina, and Cheirurina) which share a distinctive protaspis (developmental stage lacking segments) type. The Cheirurina and Calymenina retain a rostral plate (an apomorphy) but in virtually all Phacopina the free cheeks are yoked as a single piece.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. Schizochroal eyes are compound eyes with up to around 700 separate lenses.These rare fossil trilobite's are sized from approximately 5/8  to 1 1/4 inch long by 5/8  to 1 inch wide and about 1 inch thick and come from northern Africa.Each winner will receive 7 fossils scooped from fossils as pictured.These are nice quality pieces for hands on learning and collecting.
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