Genus
Polydorichnus Ishikawa et Kase, 2007
Current taxon is already existed. See initial taxon Helicotaphrichnus
Taxon ID: 16125 | 2018-05-01 / 2019-04-08
Fossil group: Ichnofossils
Belongs to: Bioerosional trace fossils
1 Other version of taxon: Helicotaphrichnus
Baltoscandian species (in database):
Taxon description
Buatois et al., 2017
Category of architectural design: 2.63. Circular holes and pit-shaped borings.
Ishikawa & Kase, 2007
Diagnosis.⎯Very small hole (usually less than 2 mm) with circular to elliptical outer opening, suggested to be commensal in origin and present only in subapical whorls of gastropod shells. Axis of hole usually slightly oblique to substrate surface (mostly toward clockwise coiling direction of whorl). Boring associated with detrital mud tube, if preserved, in anterior two or three whorls of gastropod, and small abraded area on columella just beneath bore-hole opening.
Classification