Ichnofossils

Arachnostega gastrochaenae Bertling, 1992

Taxon description

Bertling, 1992

Diagnosis: Ramified burrows on the surface of internal moulds with an oval crosssection which increases slowly in diameter by a factor of 5 to 10, approximately. At ramifications, the bent main burrow is not reduced in size. Lateral burrows mostly have a smaller diameter. Polygonal areas on the surface of internal moulds may be produced by the unification of ramified burrows.
Description: The burrows are best visible on the surface of internal moulds and may either be empty or filled by sparite. The diameter is 30~t to 5011 in the earliest visible stages and gradually increases up to 15011. Because the traces are not confined to the surface of internal moulds they sometimes appear to be constricted or even terminated, depending on the angle of descent from the surface.

Synonymy list
1992     Arachnostega gastrochaenae n. ichnosp. — Bertling, pp. 180, fig. 2a-f
1994     Arachnostega gastrochaenae Bertling, 1992 — Fürsich et al., pp. 161, fig. Pl. 3:1-2,4
1999     Arachnostega gastrochaenae Bertling, 1992 — Fürsich & Pandey, pp. 126, fig. fig.7g
2002     Arachnostega gastrochaenae Bertling, 1992 — Aceñoaza & Aceñolaza, pp. 183, fig. Fig. 6D
2002     Arachnostega gastrochaenae Bertling — Aceñolaza & Aceñolaza, pp. 182, fig. 6D
2004     Arachnostega gastrochaenae Bertling, 1992 — Donovan & Jagt, pp. 120
2007     Arachnostega gastrochaenae Bertling, 1992 — Farinati, pp. 281
2010     Arachnostega gastrochaenae Bertling, 1992 — Gil Cid & Lebrón Moreno, pp. 177-178, fig. 4:1, 2
2011     Arachnostega gastrochaenae Bertling, 1992 — Breton, pp. 7, fig. Fig. 7,8,9,10,11
2011     Arachnostega gastrochaenae Bertling — Fatka et al., pp. 372-375, fig. text-figs. 4, 5
2013     Arachnostega gastrochaenae Bertling — Aceñolaza et al., pp. 315-322
2014     Arachnostega gastrochaenae Bertling, 1992 — Vinn et al., pp. 8, fig. 3, 4
2016     Arachnostega gastrochaenae Bertling, 1992 — Neto de Carvalho et al., pp. 30, fig. 4H
Selection of related publications
Toom, U., Vinn, O., Hints, O. 2019. Ordovician and Silurian ichnofossils from carbonate facies in Estonia: A collection-based review. Palaeoworld 28, 1-2, 123-144. DOI:10.1016/j.palwor.2018.07.001
Vinn, O., Wilson, M. A., Zatoń, M., Toom, U. 2014. The trace fossil Arachnostega in the Ordovician of Estonia (Baltica). Palaeontologia Electronica 17, 17.3.40A, 1-9. DOI:10.26879/477
Mikuláš R., Dronov, A. V. 2005. Trace fossils. 6th Baltic Stratigraphical Conference. Cambrian and Ordovician of St. Petersburg Region. Guidebook of the pre-conference field trip, pp. 33-38.