Fig. 5

Micro-CT renderings of shell piece that contains the colony of P. clionoides observed during the growth experiment shown in Fig. 4. A Overview of bored shell of the gastropod Drupa morum with zooids labeled in red and bud1 in green. Rectangle indicates area of detailed scans shown in B–E. B Close-up of shell surface with boring traces of tubulets and apertures. C–E The colony part that developed during the growth experiment was segmented separately and is marked in green. The volume of the green colony part was calculated with the label analysis tool within the reconstruction software Amira. Abbreviations ast – additional stolon, az – autozooid, b1 – bud1; b2 – bud2, b3 – bud3, pst – principal stolon, st – stolon, tu – tubulet