A suspension-feeding anomalocarid from the Early Cambrian

Jakob Vinther, Martin Stein, Nicholas R Longrich, David A T Harper

Research output: Contribution to journalLetter (Academic Journal)peer-review

109 Citations (Scopus)
421 Downloads (Pure)


Large, actively swimming suspension feeders evolved several times in Earth's history, arising independently from groups as diverse as sharks, rays and stem teleost fishes, and in mysticete whales. However, animals occupying this niche have not been identified from the early Palaeozoic era. Anomalocarids, a group of stem arthropods that were the largest nektonic animals of the Cambrian and Ordovician periods, are generally thought to have been apex predators. Here we describe new material from Tamisiocaris borealis, an anomalocarid from the Early Cambrian (Series 2) Sirius Passet Fauna of North Greenland, and propose that its frontal appendage is specialized for suspension feeding. The appendage bears long, slender and equally spaced ventral spines furnished with dense rows of long and fine auxiliary spines. This suggests that T. borealis was a microphagous suspension feeder, using its appendages for sweep-net capture of food items down to 0.5 mm, within the size range of mesozooplankton such as copepods. Our observations demonstrate that large, nektonic suspension feeders first evolved during the Cambrian explosion, as part of an adaptive radiation of anomalocarids. The presence of nektonic suspension feeders in the Early Cambrian, together with evidence for a diverse pelagic community containing phytoplankton and mesozooplankton, indicate the existence of a complex pelagic ecosystem supported by high primary productivity and nutrient flux. Cambrian pelagic ecosystems seem to have been more modern than previously believed.

Original languageEnglish
Pages (from-to)496-499
Number of pages12
Issue number7493
Early online date26 Mar 2014
Publication statusPublished - 27 Mar 2014


Dive into the research topics of 'A suspension-feeding anomalocarid from the Early Cambrian'. Together they form a unique fingerprint.

Cite this