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Fossil Record A palaeontological open-access journal of the Museum für Naturkunde

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Foss. Rec., 21, 1-9, 2018
https://doi.org/10.5194/fr-21-1-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
10 Jan 2018
Large dendrinids meet giant clam: the bioerosion trace fossil Neodendrina carnelia igen. et isp. n. in a Tridacna shell from Pleistocene–Holocene coral reef deposits, Red Sea, Egypt
Max Wisshak1 and Christian Neumann2 1Senckenberg am Meer, Marine Research Department, 26382 Wilhelmshaven, Germany
2Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, 10115 Berlin, Germany
Abstract. The rosette-shaped microboring trace fossil Neodendrina carnelia igen. et isp. n. – a large representative of the ichnofamily Dendrinidae – is identified on the inner side of the giant clam Tridacna maxima from Pleistocene to Holocene coral reef deposits of the El Quseir district at the Egyptian Red Sea coast. The new dendritic bioerosion trace fossil is diagnosed as a radial rosette comprised of a prostrate system of roofless canals that ramify in a strictly dichotomous fashion forming intermittent branches of uniform width and rounded terminations. The trace appears to be rare, although in the type material it occurs in a cluster of more than a hundred specimens. The location of traces on the interior surface of the shell suggests that boring occurred post-mortem to the host. Its record is presently restricted to shallow marine, euphotic, tropical coral reef settings in the Western Indo-Pacific (Red Sea and Madagascar). The biological identity of the trace maker cannot be resolved yet, but several lines of reasoning allow speculations directed towards a complex attachment scar, perhaps produced by a benthic foraminiferan or a macrophyte.

Citation: Wisshak, M. and Neumann, C.: Large dendrinids meet giant clam: the bioerosion trace fossil Neodendrina carnelia igen. et isp. n. in a Tridacna shell from Pleistocene–Holocene coral reef deposits, Red Sea, Egypt, Foss. Rec., 21, 1-9, https://doi.org/10.5194/fr-21-1-2018, 2018.
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A new bioerosion trace fossil, the rosette-shaped microboring Neodendrina carnelia igen. et isp. n., is described from a giant clam (Tridacna maxima) discovered in Pleistocene to Holocene coral reef deposits of the Egyptian Red Sea coast. The trace was formed as a complex attachment scar after the host had ceased. The biological identity of the trace maker, probably either a benthic foraminiferan or a macrophyte, is discussed.
A new bioerosion trace fossil, the rosette-shaped microboring Neodendrina carnelia igen. et isp....
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