Protovirgularia dichotoma—Protovirgularia rugosa: An Example of a Compound Trace Fossil from the Lower Cretaceous (Agrio Formation) of the Neuquén Basin, Argentina

Trace fossils from the Lower Muschelkalk of Raciborowice Górne (North Sudetic Synclinorium, SW Poland) and their palaeoenvironmental interpretation

“…and Goldring et al (2005) and interpreted it as an escape structures from a Lockeia-like resting burrow. Annelids, arthropods, crabs, dragonfly larvae were also proposed as its possible producers (Han and Pickerill 1994;Metz 2002Metz , 2009Kim et al 2005;Gaillard and Racheboeuf 2006;Fernández et al 2010). It is known from the Cruziana ichnofacies (MacEachern et al 2007a.…”

“…Among potential producers are protobranch bivalves (Seilacher and Seilacher 1994;Mángano et al 1998;Bradshaw 2010), crustaceans (ostracods), unionid and corbiculid bivalves, as well as viviparid gastropods Goldring et al 2005;Lawfield and Pickerill 2006;Fernández et al 2010;Kane 2010).…”

Ichnology of Marginal Marine Facies of the Agrio Formation (Lower Cretaceous, Neuquén Basin, Argentina) at its Type Locality

“…dichotoma and P. cf. rugosa were found in this section but are not described herein, since they were reported by Fernández et al (2010).…”

Ichnotaxonomy of the Cambrian Spence Shale Member of the Langston formation, Wellsville Mountains, Northern Utah, USA

“…17.1). Protovirgularia specimens illustrated by Fernández, Pazos, and Aguirre-Urreta (2010) show intergradation between P. dichotoma and P. rugosa, and the lateral projections of the Spence Shale P. dichotoma are more oblique and wedgelike, and thus are more similar to P. dichotoma. However, the morphologic characteristic that separates P. dichotoma and P. rugosa is the presence of a Lockeia-like object at the termination of P. rugosa (sensu Seilacher & Seilacher, 1994;Uchman, 1998), which the Spence Shale P. dichotoma specimen lacks.…”