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Query: classification: "42.73"

Author	J.W.M. Jagt
Title	A Late Cretaceous gastropod homing scar (possibly ichnogenus Lacrimichnus) from southern Limburg, The Netherlands
Journal	Scripta Geologica
Volume	134
Year	2007
Pages	19-25
ISSN	03757587
Keywords	Trace fossil; homing scar; Gastropoda; Lacrimichnus; Cirripedia; Upper Cretaceous; Maastrichtian; The Netherlands
Abstract	An isolated gastropod homing scar, etched into an arcoscalpelline (cirripede) scutum, is recorded from the upper Nekum Member (Maastricht Formation, upper Maastrichtian) at the ENCI-HeidelbergCement Group quarry. This trace may be assignable to the ichnogenus Lacrimichnus Santos, Mayoral & Muñiz, that comprises etching scars produced by Neogene calyptraeid and/or capulid gastropods and ostreid bivalves from southern Spain and Portugal. However, it differs from both ichnospecies currently contained in that ichnogenus, L. bonarensis and L. cacelensis, in showing a relatively deep depression around the rim, irregularly distributed pit- and slit-like depressions, and an irregularly subcircular outline. Despite the wealth of available hard substrates (bivalves, coleoids, echinoids, etc.) and of hipponicid gastropods, such traces are exceedingly rare in the type area of the Maastrichtian Stage.
Classification	38.22 ; 42.73
Document type	article
Download paper	http://www.repository.naturalis.nl/document/45035