摘要: Millions of years before arthropods had succeeded in colonizing the land, primaeval oceans were teeming with them. They, turn, probably evolved from segmented, worm-like ancestors, similar to today’s polychaete annelids; but fossil evidence this is lacking. Trilobites and Crustacea are known Cambrian period, Eurypterida Ordovician, Diplopoda Devonian or possibly earlier, Collembola Insecta also Devonian. Myriapods, Collembola, descended an onychophoran-like ancestor. The mid-Cambrian Aysheaia pedunculata (found British Columbia a marine deposit, along polychaetes, trilobites, holothurians etc.) may have been such animal, other interpretations it made.
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