Undichna Anderson, 1976

Wisshak, Max, Volohonsky, Eden & Blomeier, Dierk, 2004, Acanthodian fish trace fossils from the Early Devonian of Spitsbergen, Acta Palaeontologica Polonica 49 (4), pp. 629-634 : 632

Ichnogenus Undichna Anderson, 1976

Type species: Undichna simplicitas Anderson, 1976 .

Diagnosis.—Swimming traces comprising a set of sinusoidal drag marks (incised grooves) with a common wavelength and alignment. Individual drag marks may be continuous, or the troughs/crests may be preferentially absent or preferentially present. There may be up to nine sinusoidal elements in a set; commonly, there are only two, and in some cases just one. Waves occur as (1) parallel pairs, (2) non−parallel pairs which are (a) intertwined or (b) separate, and (3) unpaired waves. These wave types occur in a variety of combinations. The traces are preserved as impressions (and corresponding moulds) on parting surfaces of flaggy rocks (after Higgs 1988; emended from Anderson 1976).