Planavolites homolensis Mikulaš, 1992

Description: See diagnosis of the ichnogenus. Horizontal dimensions of borings from the Kotouč quarry range from 10 to 95 mm (Houša 1992).

Remarks: The boring was described and interpreted by Houša (1974, 1992) but it has not been named either formally or unformally. According to Houša (1992), the maker of the boring was obviously an organism gnawing at algae on the limestone. A plot with a smoothed surface suitable to consumation of algae could have been extended by several generations. It may be assumed that even several individuals of makers - chitons, gastropods, echinoids - were living in larger borings.