Helminthopsis abeli Książkiewicz, 1977

Emended diagnosis: Helminthopsis that is loosely winding or meandering. Meanders irregular and variable in shape, mostly deep, but also shallow, with bell-shaped and, or, horseshoe-shaped segments, but no straight segments or loops. The axes of the meanders are not parallel. Diameter is variable and generally constant within a single specimen (modified from Książkiewicz, 1977).

Description: Irregularly meandering, unbranched, smoothsurfaced, horizontal burrows. Meander dimensions are variable. Amplitude of the meanders ranges from 1 to 6 mm. Meander length varies from 6 to 16 mm. Burrow length ranges from 28 to 70 mm. Diameter varies from 1 to 1.5 mm, but is relatively constant within each specimen. In general, meanders tend to be low and broad. Preserved as hypichnial ridges.