Fig. 2
From: Experimental neoichnology of crawling stalked crinoids
Surface features produced by Metacrinus rotundus. a General view of median trails and lateral tracks left by cirriferous stalk and arms, respectively. b Close up of median trails. c Close up of lateral tracks. d–f. Gypsum casts (hypichnia) of the above illustrated traces (a–c; correspondingly). Scale bars 1 cm