Ichnofossils
Species

Phycosiphon incertum Fischer-Ooster, 1858

Taxon description

Dorador et al., 2019

Description.This ichnotaxon is observed as small, dark, contorted burrows surrounded by a poorly definedlight halo (Fig. 3E). Diameter is 0.2–0.5 cm.

Hammersburg et al., 2018

Diagnosis.—Small, oblique or parallel to bedding, spreiten-filled burrow systems comprised of protrusive U-shaped lobes with dark, fine-grained cores and light, coarse-grained mantles (Wetzel & Bromley, 1994; Głuszek, 1998; Uchman, 1998).

Hovikoski et al., 2019

Horizontal to subhorizontal elongated lobes encircled partially by a thin, commonly winding marginal tunnel. The lobes are 2–3 mm wide, up to 16 mm long. The marginal tunnel is about 3 mm wide and filled with lighter material than the surrounding rock.

This is a typical deposit feeder trace fossil. For its taxonomy see Wetzel and Bromley (1994). Morphological problems were studied by Naruse and Nifuku (2008) and Bednarz and McIlroy (2009).

Pickerill & Forbes, 1979

Remarks-The burrows resemble Furculosus carpathicus Roniewicz and Pienkowski 1977 but this forms tighter fork-like loops, has a larger burrow diameter, and a greater 3-dimensional continuity.

Synonymy list
1858     Phycosiphon incertum F. O. — Fischer-Ooster , pp. 59 , fig. 15:4
1962     Phycosiphon incertum — Häntzschel , pp. W208 , fig. 29(6a,b)
1971     Phycosiphon incertum Fischer-Ooster, 1858 — Chamberlain , pp. 238 , fig. 30: 10, 13, 15: 31:11
1979     Anconichnus horizontalis Kern 1978 — Pickerill & Forbes , pp. 2025
1989     Phycosiphon incertum Fischer-Ooster, 1858 — Stepanek & Geyer , pp. 27 , fig. 6:43-47
1990     Phycosiphon incertum Fischer-Ooster, 1858 — Dam , pp. 141 , fig. fig. 10D
1994     Anconichnus horizontalis Kern (1978) — Wetzel & Bromley
1996     Phycosiphon incertum Fischer-Ooster, 1858 — Orr et al. , pp. 248 , fig. 8C
1998     Phycosiphon incertum Fischer-Ooster, 1858 — Głuszek , pp. 536 , fig. 14; 11C, 4A, 12B
2006     Phycosiphon incertum Fischer-Ooster, 1858 — Gaillard & Racheboeuf , pp. 1214 , fig. 9.4
2007     Phycosiphon incertum Fischer-Ooster, 1858 — Uchman , pp. 993
2007     Phycosiphon incertum — Pervesler & Uchman
2008     Phycosiphon incertum — Naruse & Nifuku , pp. 270-279 , fig. 11, 12, 14
2018     Phycosiphon incertum Fischer-Ooster, 1858 — Hovikoski et al. , pp. 11 , fig. 8E
2018     Phycosiphon incertum Fischer-Ooster, 1858 — Hammersburg et al. , pp. 29 , fig. Fig. 16.1–16.6
2018     Phycosiphon incertum — Dorador et al. , pp. 17-18 , fig. 3E
Selection of related publications
Egenhoff, S., Maletz, J., Ahlberg, P., Mast, A., Frisk, Å. M., Ebbestad, J. O. R., Newby, W. 2018. Sedimentology of the Lower Ordovician (upper Tremadocian) Bjørkåsholmen Formation at Flagabro, southern Sweden. GFF 140, 1, 55-65. DOI:10.1080/11035897.2018.1445777
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Classification
Organism groupBiota
Ichnofossil groupIchnofossils
Soft-sediment trace fossils
GenusPhycosiphon
Speciesgeniculatum
incertum
References based on distribution