These unsegmented worms have been found in Cambrian rocks, such as the legendary Burgess Shale. |
Moreover, this rod was unsegmented, for the notochord is devoid of segmentation. |
Slugs and snails have a soft, unsegmented body measuring 2 to 4 cm in length. |
The fin rays sprouting from the ends are also unique in having a long, stiff unsegmented basal area. |
Sipunculans, or peanut worms, have an unsegmented body with a retractable introvert. |
In lancelets, the trunk somites extend and fuse ventrally to give the unsegmented periviscelar coelom. |