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It’s distributed in the contemporary waters of southern Australia and in Chile. Although a minor factor of contemporary marine fauna, agnathans were outstanding among the fish within the early Paleozoic. Possible remains of agnathans are found within the fossil document dating to the Late Cambrian and definitive agnathan remains occur within the middle Ordovician (Nelson 1994). The Silurian and Lower Devonian showed the greatest radiation in forms (Nelson 1994). These cyclostomes resemble eels in look and
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