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Ghost shrimps (Decapoda: Axiidea: Callianassidae) as producers of an Upper Miocene trace fossil association from sublittoral deposits of Lake Pannon (Vienna Basin, Slovakia).

Hyžný M, Šimo V, Starek D - Palaeogeogr Palaeoclimatol Palaeoecol (2015)

Bottom Line: During deposition of the sediments the area was part of the large, long-lived brackish to freshwater Lake Pannon.As today, no ghost shrimp are known from long-lived brackish lakes.Egbellichnus from Gbely is the only, although indirect, record of ghost shrimp from a brackish lake environment reported so far.

View Article: PubMed Central - PubMed

Affiliation: Department of Geology and Paleontology, Natural History Museum Vienna, Burgring 7, A-1010 Vienna, Austria ; Department of Geology and Palaeontology, Faculty of Natural Sciences, Comenius University, Mlynská dolina G1, SK-842 15 Bratislava, Slovakia.

ABSTRACT

Numerous trace fossils are described from the Late Miocene sediments of the Bzenec Formation exposed at the Gbely section (the Vienna Basin, Slovakia). During deposition of the sediments the area was part of the large, long-lived brackish to freshwater Lake Pannon. Most of the trace fossils are attributed herein to Egbellichnus jordidegiberti igen et ispec. nov. and are interpreted as burrows produced by decapod crustaceans, specifically by a ghost shrimp of the family Callianassidae. This interpretation is based on two independent lines of evidence: environmental requirements of large bioturbators and the burrow morphology itself. The new ichnotaxon is distinguished from other related ichnotaxa by a combination of typically inclined (roughly at an angle of 45°) cylindrical burrows, absence of lining, and tunnels making loops or bends at approximately right angles. The burrow systems at Gbely document the survival of ghost shrimp long after the closure of all seaways and the origin of Lake Pannon. As today, no ghost shrimp are known from long-lived brackish lakes. Egbellichnus from Gbely is the only, although indirect, record of ghost shrimp from a brackish lake environment reported so far.

No MeSH data available.


Related in: MedlinePlus

Egbellichnus jordidegiberti igen. et isp. nov. (A) Large burrow part in situ.White arrows point to enlarged portions at point of bifurcation. In white rectangle an inclined burrow part with right-angle bending is preserved. In black rectangle a spiral-shaped burrow part is preserved. (B–D) Burrow parts analogous to those in A (not the same specimens). Scale bar equals 10 mm.
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f0040: Egbellichnus jordidegiberti igen. et isp. nov. (A) Large burrow part in situ.White arrows point to enlarged portions at point of bifurcation. In white rectangle an inclined burrow part with right-angle bending is preserved. In black rectangle a spiral-shaped burrow part is preserved. (B–D) Burrow parts analogous to those in A (not the same specimens). Scale bar equals 10 mm.

Mentions: The trace is composed of several parts (Fig. 8). The horizontal component often shows branching; two forms have been observed. The first type can be considered a true Thalassinoides-like branching (Figs. 5B, 9B). The second type seems to be a successive branching, i.e. it consists of two tunnels of different diameter (Fig. 5E) although interpreting these structures as preservational artefacts cannot be excluded. Regular rounded winding (meandering) of individual simple tunnels in a horizontal direction without branching has not been observed. The subvertical component consists of simple shafts connecting parts of the burrow system. The inclined component is the most distinctive feature of this ichnotaxon. This component consists of tunnels or shafts which are inclined typically at an angle of about 45° to the horizontal surface. Two main morphologies can be recognized in this component; the tunnel makes loops resembling spirally shaped Gyrolithes-like burrows, or/and the tunnel turns at right angle (Figs. 5C, F). If the first component prevails the burrow shape resembles a corkscrew (Fig. 6); if the second prevails, the shape follows an irregular zigzag pattern (Fig. 5B). The two morphologies can alternate.


Ghost shrimps (Decapoda: Axiidea: Callianassidae) as producers of an Upper Miocene trace fossil association from sublittoral deposits of Lake Pannon (Vienna Basin, Slovakia).

Hyžný M, Šimo V, Starek D - Palaeogeogr Palaeoclimatol Palaeoecol (2015)

Egbellichnus jordidegiberti igen. et isp. nov. (A) Large burrow part in situ.White arrows point to enlarged portions at point of bifurcation. In white rectangle an inclined burrow part with right-angle bending is preserved. In black rectangle a spiral-shaped burrow part is preserved. (B–D) Burrow parts analogous to those in A (not the same specimens). Scale bar equals 10 mm.
© Copyright Policy - CC BY
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4459479&req=5

f0040: Egbellichnus jordidegiberti igen. et isp. nov. (A) Large burrow part in situ.White arrows point to enlarged portions at point of bifurcation. In white rectangle an inclined burrow part with right-angle bending is preserved. In black rectangle a spiral-shaped burrow part is preserved. (B–D) Burrow parts analogous to those in A (not the same specimens). Scale bar equals 10 mm.
Mentions: The trace is composed of several parts (Fig. 8). The horizontal component often shows branching; two forms have been observed. The first type can be considered a true Thalassinoides-like branching (Figs. 5B, 9B). The second type seems to be a successive branching, i.e. it consists of two tunnels of different diameter (Fig. 5E) although interpreting these structures as preservational artefacts cannot be excluded. Regular rounded winding (meandering) of individual simple tunnels in a horizontal direction without branching has not been observed. The subvertical component consists of simple shafts connecting parts of the burrow system. The inclined component is the most distinctive feature of this ichnotaxon. This component consists of tunnels or shafts which are inclined typically at an angle of about 45° to the horizontal surface. Two main morphologies can be recognized in this component; the tunnel makes loops resembling spirally shaped Gyrolithes-like burrows, or/and the tunnel turns at right angle (Figs. 5C, F). If the first component prevails the burrow shape resembles a corkscrew (Fig. 6); if the second prevails, the shape follows an irregular zigzag pattern (Fig. 5B). The two morphologies can alternate.

Bottom Line: During deposition of the sediments the area was part of the large, long-lived brackish to freshwater Lake Pannon.As today, no ghost shrimp are known from long-lived brackish lakes.Egbellichnus from Gbely is the only, although indirect, record of ghost shrimp from a brackish lake environment reported so far.

View Article: PubMed Central - PubMed

Affiliation: Department of Geology and Paleontology, Natural History Museum Vienna, Burgring 7, A-1010 Vienna, Austria ; Department of Geology and Palaeontology, Faculty of Natural Sciences, Comenius University, Mlynská dolina G1, SK-842 15 Bratislava, Slovakia.

ABSTRACT

Numerous trace fossils are described from the Late Miocene sediments of the Bzenec Formation exposed at the Gbely section (the Vienna Basin, Slovakia). During deposition of the sediments the area was part of the large, long-lived brackish to freshwater Lake Pannon. Most of the trace fossils are attributed herein to Egbellichnus jordidegiberti igen et ispec. nov. and are interpreted as burrows produced by decapod crustaceans, specifically by a ghost shrimp of the family Callianassidae. This interpretation is based on two independent lines of evidence: environmental requirements of large bioturbators and the burrow morphology itself. The new ichnotaxon is distinguished from other related ichnotaxa by a combination of typically inclined (roughly at an angle of 45°) cylindrical burrows, absence of lining, and tunnels making loops or bends at approximately right angles. The burrow systems at Gbely document the survival of ghost shrimp long after the closure of all seaways and the origin of Lake Pannon. As today, no ghost shrimp are known from long-lived brackish lakes. Egbellichnus from Gbely is the only, although indirect, record of ghost shrimp from a brackish lake environment reported so far.

No MeSH data available.


Related in: MedlinePlus