Ichnofossils

Rosselia socialis Dahmer, 1937

Taxon description

Buatois et al., 2016b

Ethology and tracemaker. Undoubtedly, the best example of equilibrium structure is represented by the ichnogenus Rosselia. Nara (1995) undertook a morpho-ethologic analysis of Rosselia socialis, concluding that the most likely tracemakers are terebellid polychaetes. He suggested that the burrow lining was produced by the outward expansion resulting from accretion of muddy material
on the inner surface of the lining. Nara (1995) concluded that this model supports a detritus-feeding strategy. In addition, he noted that similar structures are made in modern shallow-marine settings by terebellid polychaetes (Aller and Yingst, 1978; Sch€afer, 1972). Subsequently, modern Rosselia-like burrows were also attributed to cirratulids (Gingras et al., 1999, 2008), with the genus Cirriformia recognized as a producer (Zorn et al., 2007). Based on modern and Holocene Rosselia-like examples, spionid polychaetes have been proposed as producers as well (Olivero et al., 2012).

Fernández & Pazos, 2012

Diagnosis. Rosselia displaying bulb-like swelling(s) in the proximal part of burrow (emended by Uchman and Krenmayr, 1995).
Description. Conical structure, sub-perpendicular to bedding, with a maximum diameter (2.3 cm) at the top and a minimum diameter (0.8 cm) at the base. The approximate length is 10 cm. Cone-in-cone laminae are observed internally. It is preserved as endichnia.

Howard & Frey, 1984

Diagnosis Small central burrows surrounded by concentric, funnellike laminae, nested convex downward, terminating in a subcylindrical, concentrically layeredstem.

Synonymy list
1971     Rosselia socialis Dahmer, 1937 — Chamberlain, pp. 240, fig. 30:16,17; Text-fig. 8C-G
1984     Rosselia socialis Dahmer, 1937 — Howard & Frey, pp. 209, fig. 18A-H
1985     Rosselia socialis Dahmer, 1937 — Frey & Howard, pp. 389, fig. 10.4; 16.5; 16.8; 19.2; 20.1-20.8
1997     Rosselia socialis Dahmer, 1937 — Jensen, pp. 80
1998     Rosselia socialis Dahmer, 1937 — Głuszek, pp. 538, fig. 16A,B
2012     Rosselia socialis Dahmer, 1937 — Fernándes & Pazos, pp. 516, fig. 6.1
2016     Rosselia socialis Dahmer, 1937 — Buatois et al., pp. 147-155, fig. 3, 4
2017     Rosselia socialis — Sedorko et al., pp. 312, fig. Fig. 3L
Selection of related publications
Jensen, S. 1997. Trace fossils from the Lower Cambrian Mickwitzia sandstone, south-central Sweden. Fossils and Strata 42, 1-110.
References based on distribution