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

Juan Jose Rustan and Diego Balseiro
The phacopid trilobite Echidnops taphomimus n. sp. from the Lower Devonian of Argentina; insights into infaunal molting, eye architecture and geographic distribution
Journal of Paleontology (November 2016) 90 (6): 1100-1111

Abstract

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


ISSN: 0022-3360
EISSN: 1937-2337
Coden: JPALAZ
Serial Title: Journal of Paleontology
Serial Volume: 90
Serial Issue: 6
Title: The phacopid trilobite Echidnops taphomimus n. sp. from the Lower Devonian of Argentina; insights into infaunal molting, eye architecture and geographic distribution
Affiliation: Universidad Nacional de Cordoba, Cordoba, Argentina
Pages: 1100-1111
Published: 201611
Text Language: English
Publisher: Paleontological Society, Lawrence, KS, United States
References: 76
Accession Number: 2017-006241
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 1 table, geol. sketch map
S30°19'60" - S30°19'60", W69°00'00" - W69°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201705
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