Species
Diplocraterion helmerseni (Öpik, 1929)
Current taxon already exists. See initial taxon Diplocraterion parallelum
Taxon ID: 6641
Fossil group: Ichnofossils
Belongs to: Diplocraterion
Other version of taxon: Diplocraterion parallelum
Stratigraphic distribution: Cambrian (header.f_taxon_age_within 538.8 – 485.4 header.f_taxon_age_within_unit)
Taxon description
Rajkonwar et al., 2013
Description: Vertical U-shaped burrow with protrusive spreiten and broad base; tubes are not parallel to each other and their diameter is also variable (0.9 to 1.2 cm). The burrow penetrates 12 cm in the sediment; diameter of the tube increases downward and their maximum diameter (1.2 cm) was observed at the base of the burrow. Burrow filled sediments are darker than the host sediments but spreiten is light coloured.
Type specimen data
Synonymy list
1929 Corophioides Helmerseni n. sp. — Öpik , pp. 33, fig. 4
1974 Diplocraterion helmerseni (Õpik 1929) — Fürsich , pp. 959, fig. text fig.5
1998 Diplocraterion helmerseni (Õpik 1929) — Stanley & Pickerill , pp. 14, fig. 4:2
2013 Diplocraterion helmerseni Õpik 1929 — Rajkonwar et al. , pp. 23, fig. 2f
Selection of related publications
Mens, K. A., Pirrus, E. A. 1977. Stratotypes of the Cambrian Formations of Estonia. pp. 1-68. Valgus.
Öpik, A. 1929. Studien über das estnische Unterkambrium (Estonium), I-IV. Tartu Ülikooli Geoloogia Instituudi Toimetused 15, 1-56.
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Klassificering
| Organism group | Biota |
| Ichnofossil group | Ichnofossils |
| Bioturbation trace fossils | |
| Family | Rhizocoralliidae |
| Genus | Diplocraterion |
| Species | biclavatum |
| habicki | |
| helmerseni | |
| luniforme | |
| morgani | |
| parallelum | |
| polyupsilon | |
| saxicavum | |
| ultimum | |
| yoyo |
References based on distribution
- Öpik, 1929a Narva Joaoru outcrop Tiskre Formation