Journal
BULLETIN OF GEOSCIENCES
Volume 86, Issue 3, Pages 665-673Publisher
CZECH GEOLOGICAL SURVEY
DOI: 10.3140/bull.geosci.1275
Keywords
Durophagous predation; Mandibulichnus serratus nov ichnogen.; nov ichnosp.; Cambrian; trilobites; Spain
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Funding
- Ministerio de Ciencia e Innovacion of Spain [CGL2006-12975/BTE]
- European Union
- Ministerio de Educacion of Spain [JCI-2008-02431, JCI-2009-05319]
- Junta de Andalucia (Spain) [RNM 316]
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Exoskeletal abnormalities in middle Cambrian paradoxidid trilobites from Purujosa (Eastern Iberian Chain, NE Spain) are herein analyzed for the first time. Two distinct types are reported. The first is represented by triangular or asymmetrical V-to W-shaped breaks on margins of isolated sclerites (cranidia, free cheeks and hypostomes). The second group is represented by shortened thoracic pleural spines in complete or nearly complete individuals. Possible causes of these injuries are discussed, but in some cases a single cause/effect explanation is not apparent. A new ichnotaxon, Mandibulichnus serratus nov. ichnogen., nov. ichnosp., is erected to refer to serrated breakage of the margins of isolated trilobite sclerites produced by active predation or scavenging.
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