First record of Podichnus in orthide brachiopods from the Lower Ordovician (Tremadocian) of NW Argentina and its relation to the early use of an ethological strategy
作者： A. Santos , E. Mayoral , E. Villas , Z. Herrera , G. Ortega
DOI: 10.1016/J.PALAEO.2014.02.003
关键词: Geology 、 Paleontology 、 Trace fossil 、 Tremadocian 、 Mean diameter 、 Lower ordovician 、 Ordovician
摘要: Abstract Well preserved etchings from the pedicle attachment of brachiopods occur on orthide brachiopod shells Lower Ordovician (Tremadocian) NW Argentina. Under name Podichnus conicus isp. n. this trace fossil is interpreted as a fixichnia produced by pedicles upon hard substrates. The characterized an irregular and asymmetrical cluster circular pits. Each individual pit has typical conical shape presents external mean diameter/length ratio close to 1. occurrence P. in Tremadocian oldest record ichnogenus, points producers for first time. presence structure provides new information regarding colonization biogenic substrates during Early adaptive strategy its use brachiopods.
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