''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