Figure 4: Behavioural traces attributed to certain Ordovician asaphid trilobites, reflecting ventral anatomy and preserved as convex hyporeliefs in sandstone. | Scientific Reports

Figure 4: Behavioural traces attributed to certain Ordovician asaphid trilobites, reflecting ventral anatomy and preserved as convex hyporeliefs in sandstone.

From: Digestive and appendicular soft-parts, with behavioural implications, in a large Ordovician trilobite from the Fezouata Lagerstätte, Morocco

Figure 4

(a) Trail: Cruziana rugosa d’Orbigny, from early Dapingian of the Zenta Range near Laguna Verde, Argentina (range of the ichnospecies: Floian to Sandbian), MGM-6760X. (b) Resting burrow, Rusophycus morgati Baldwin, Armorican Sandstone (Floian) from the Armorican Massif, western France, interpreted as made by the trilobite Ogyginus14, IGR-114954. (c,d) Resting burrows, Rusophycus carleyi (James), upper Fezouata Shale (early Floian beds), from SW Ouzina, southern Tafilalt (eastern Anti-Atlas, Morocco), locally associated with the trilobite Asaphellus23. (c) MGM-6759X. (d) MGM-6758X, detail of traces attributed to endopodal spines along all the walking legs and impression of coxae to the right. hyp, hypostome impression; (a,c,d) have been whitened with MgO. Scale bar, 10 mm for (a,c,d); 20 mm for (b).

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