liik
Diplocraterion helmerseni (Öpik, 1929)
Tüüpeksemplari andmed
Taksoni kirjeldused
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.
Sünonüümika
Valik taksonit käsitlevast teaduskirjandusest
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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Klassifikatsioon
| organismirühm | Biota |
| ihnorühm | Ichnofossils |
| sugukond | Rhizocoralliidae |
| perekond | Diplocraterion |
| liik | biclavatum |
| helmerseni | |
| luniforme | |
| morgani | |
| parallelum | |
| polyupsilon | |
| ultimum | |
| yoyo |
Levik kirjandusandmetel
- Öpik, 1929a Narva Joaoru paljand Tiskre kihistu