The phacopid trilobite Echidnops taphomimus n. sp. from the Lower Devonian of Argentina; insights into infaunal molting, eye architecture and geographic distribution

摘要: Abstract. Some Silurian-Devonian Argentinian trilobites characterized by infaunal behavior during molting are considered. After a taxonomic reappraisal, species previously referred to lineage of the phacopid Paciphacops is proposed as Echidnops taphomimus new species, from Lower Devonian (probably late Lochkovian) Talacasto Formation, Argentine Precordillera. The visual surface E. indicates that irregular pattern lens arrangement, typical early phacopids such Ordovician Ormathops, can also be recognized in more derived relatives, providing insights on some evolutionary aspects development. Australia and Argentina, recording an unusual distribution southern South America, otherwise mostly linked faunas related Gondwanan, austral circum-polar basins Malvinokaffric Realm. In accordance with increasing predation pressure context of...