Fernández & Pazos, 2012
Diagnosis. Single, vertical, unbranched burrows, cylindrical or subcylindrical, lined or unlined. Burrows perfectly straight to curved, sometimes inclined to the vertical. Diameter 1–15 mm; length from a few centimeters up to 1m; diameter may vary slightly along lenght of burrow (from Alpert, 1974).
Remarks. Ethologically, this is a dwelling or feeding trace. In the cases where it is found in marine environments, the possible producers are polychaetes or phoronids (Alpert, 1974; also see Sequeira Fernandes et al., 2002 and references therein). Skolithos appears in a variety of shallow marine environments; it has been documented from normal marine settings to lagoons, bays, mouth-bars and fluvial channels
(Uchman et al., 2004).
Schlirf & Uchman, 2005
DIAGNOSIS. Unbranched, vertical to steeply inclined, straight to slightly curved, cylindrical to subcylindrical, lined or unlined structures with or without funnel-shaped top. Wall distinct or indistinct, smooth to rough, some specimens annulated; fill massive; burrow diameter in some individualsslightly inconstant (Schlirf 2000).
- Troppenz, 1989 Lower Cambrian (old nomenclature)
- Mens & Pirrus, 1977 Türisalu cliff Lower Cambrian (old nomenclature)
- Palij et al., 1979 Ventspils D-3 borehole 1105 - 1135
- Öpik, 1925b Rannamõisa cliff Lower Cambrian (old nomenclature)
- Pirrus, 1992a Vendian
- Mikuláš et al., 2013 Andoma hill Frasnian
- Vinn & Wilson, 2013a Ohesaare cliff Ohesaare Stage
- Crimes, 1992a
- Müürisepp, 1958b Aseri cliff Tiskre Formation
- Clausen & Vilhjálmsson, 1986 Broens Odde outcrop, Bornholm Lower Cambrian (old nomenclature)
- Bromley & Uchman, 2003 Korsodde, Bornholm Lower Jurassic
- Bromley & Uchman, 2003 Korsodde, Bornholm Lower Jurassic
- Nielsen et al., 1996 Quarry at Rønne Golf Course, Bornholm Lower Cretaceous
- Mikuláš, 2000b Rejkovice Middle Cambrian (old nomenclature)