Figure 4
From: New fossil assemblages from the Early Ordovician Fezouata Biota
Euarthropod fossils from Taichoute interval a2. (a) Large carapace with central carina (white arrow), similar to that seen in Aegirocassis dorsal carapace elements6. Note the presence of a brachiopod on the right side under the Carina. (b) Carapace with an asymmetrically rounded outline with an anterior protrusion similar to that seen in lateral carapace elements of hurdiids60. (c) Carapace with an asymmetrically rounded outline with one side bearing a structure similar to the upturned projection (white arrow) described for Aegirocassis lateral carapace elements6. (d) Assemblage with at least three carapaces together, some of which are elongated and tapering at one end, with a partial outline possibly resembling that of lateral carapace elements of hurdiids6. Scale bars are 4 cm in a, and 3 cm in b, c, d. By order from a to d: MCZ.IP.198899, MCZ.IP.19890, MCZ.IP.198902, and MCZ.IP.198901. All four specimens are housed at the Museum of Comparative Zoology, Harvard University, USA.
