Genus
Polydorichnus Ishikawa et Kase, 2007
Current taxon already exists. See initial taxon Helicotaphrichnus
Taxon ID: 16125
Fossiiliryhmä: Ichnofossils
Sisältyy taksoniin: Bioerosional trace fossils
Other version of taxon: Helicotaphrichnus
Baltian ja Fennoskandian lajit (tietokannassa olevat)
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.
Luokittelu