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-Euclastes acutirostris
It is preserved in exceptional way
filter-feeding appendage of Aegirocassis is considerably more complex and sophisticated than that of Tamisiocaris and may herald a shift in the Early Ordovician to large-scale filter feeding in the oceans
Heliocephalus
Gypsum also crystallizes as translucent crystals of selenite
22220 - Top Rare 11.46 inch Eldonia sp. Ordovician Jellyfish Fezouata -Euclastes acutirostrisEldonia is an extinct soft bodied cambroernid animal of unknown affinity, best known from the Fossil Ridge outcrops of the Burgess Shale, particularly in the 'Great Eldonia layer' in the Walcott Quarry. In addition to the 550 collected by Walcott, 224 specimens of Eldonia are known from the Greater Phyllopod bed, where they comprise 0. 43% of the community. Species also occur in the Chengjiang biota,and in Upper Ordovician strata of Morocco.
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