Polydorichnus subapicalis Ishikawa et Kase, 2007
Polydorichnus subapicalis is junior synonym of Helicotaphrichnus commensalis according to Wisshak et al., 2019a
| ID | 16126 |
|---|---|
| Fossil group | Bioerosional trace fossils |
| Taxon | Polydorichnus subapicalis |
| Author | Ishikawa et Kase, 2007 |
| Reference | Ishikawa & Kase, 2007a |
| Parent taxon | Polydorichnus |
| Is valid | No |
| FAD | Miocene |
| LAD | Recent |
Synonymy
| Year | Synonym | Author | Pages | Figs | Reference |
|---|---|---|---|---|---|
| 2007 | Polydorichnus subapicalis new ichnospecis | Ishikawa & Kase | 1469 | 5 |
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.