Undichna Anderson, 1976

DESCRIPTION: Ichnogenus includes those trace fossils comprising a set of horizontal sinusoidal to irregularly sinusoidal grooves with common wavelength and alignment. Grooves may or may not be accompanied by a straight, continuous furrow, upon which the grooves are superimposed. Individual grooves may be continuous, or the peaks or valleys may be preferentially absent or present. There may be as many as nine grooves in a set; commonly there are only two, and in some cases just one. Grooves occur as (1) parallel pairs, (2) nonparallel pairs which are (a) intertwined or (b) separate, and (3) unpaired grooves. Preserved as concave epirelief or convex hyporelief.

BEHAVIOR(S): Repichnia (locomotion)

ENVIRONMENTAL SETTINGS: Marine and continental freshwater aquatic settings

POSSIBLE TRACEMAKERS: Fish; producing by swimming along the bottom with fins and tail making the grooves

GEOLOGIC RANGE: Devonian-recent.

ADDITIONAL REFERENCES: Emended by Higgs, 1988. Martin and Pyenson, 1995; De Gibert et al, 1999; Costeur and Ezquerra, 2009; Filmore et al., 2011; Mikulas et al, 2013

REMARKS: May appear similar to Cochlichnus and Helminthopsis. The grooves appear as wave forms etched onto the surface.

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