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''Nereites'' is a genus of trace fossil. Modern tracemakers of incipient ''Nereites'' include worm-like organisms,Seilacher, A., 2007. Trace Fossil Analysis. Springer, Berlin, Heidelberg (226 pp.) horseshoe crabsMartin, A.J., Rindsberg, A.K., 2007. Arthropod Tracemakers of Nereites? Neoichnological observations of juvenile limulids and their paleoichnological applications. In: Miller III, W. (Ed.), Trace Fossils. Concepts, Problems, Prospects. Elsevier, Amsterdam, pp. 478–491. and hermit crabs.Baucon A., Felletti F. 2013. Neoichnology of a barrier-island system: the Mula di Muggia (Grado lagoon, Italy). Palaeogeography, Palaeoclimatology, Palaeoecology 375. Abstract available from http://www.tracemaker.com Traditionally, two models have been proposed for ''Nereites'': # in the ‘worm model’, ''Nereites'' is a feeding burrow produced by wormlike organisms, probing and backfilling laterally # in the ‘arthropod model’, the characteristic lobes are pressure-release structures made by arthropod legs. According to this interpretation, ''Nereites'' is a locomotion trail


''Nereites irregularis''

The ichnogenus ''Nereites'' includes ''Nereites irregularis'' (formerly ''Helminthoida labyrinthica'' and ''Helminthoida crassa''). They are relatively small ''Nereites'' characterized by large numbers of closely packed deeply meandering trails that tend to coil. The trails are usually horizontal and may be regular to irregular in guidance. The central tunnel is usually thicker than the envelope zone. In dense meanders, the envelope zone may touch or overlap, but it displays low-amplitude lobes in looser meanders. ''Nereites irregularis'' has not been matched with known modern organisms, but they are generally believed to have been grazing trails ( pascichnia) made by worms.


''Nereites biserialis''

''Nereites biserialis'' comprises winding trails constituted by a furrow flanked on both sides by lobes. Incipient biseriate ''Nereites'' are produced by hermit crabs occupying oblong shells (i.e. ''Cerithium'').


''Nereites uniserialis''

''Nereites uniserialis'' comprises winding trails consisting of a furrow flanked by a single row of lobes. In contrast to the roughly symmetric ''Nereites biserialis'', ''Nereites uniserialis'' is produced by hermit crabs occupying trochiform shells.


References

{{Taxonbar, from=Q16986479 Trace fossils