Polydorichnus Ishikawa et Kase, 2007
Polydorichnus is junior synonym of Helicotaphrichnus according to Wisshak et al., 2019a
| ID | 16125 |
|---|---|
| Fossil group | Bioerosional trace fossils |
| Taxon | Polydorichnus |
| Author | Ishikawa et Kase, 2007 |
| Reference | Ishikawa & Kase, 2007a |
| Parent taxon | Bioerosional trace fossils |
| Is valid | No |
| FAD | Miocene |
| LAD | Recent |
Includes:
| Species | Reference | Valid? |
|---|---|---|
| Polydorichnus subapicalis | Ishikawa & Kase, 2007a | No |
Synonymy
Descriptions and remarks
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.
Category of architectural design: 2.63. Circular holes and pit-shaped borings.