We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Body plan of Dickinsonia , the oldest mobile animals.
- Authors
IVANTSOV, Andrey Yu; ZAKREVSKAYA, Maria
- Abstract
Materials collected on the territory of the southeastern White Sea area, including diversely preserved body imprints, combined body-trace fossils, specimens with signs of intravital damage and regeneration, and extended ontogenetic series, make it possible to significantly widen the data on the body plan and biology of Dickinsonia , the oldest known mobile animal, included in the Late Precambrian taxon of high rank, Proarticulata. A number of reconstructed anatomical features were added to the obvious directly observed features of Dickinsonia , such as a consistent body shape lacking lateral appendages and temporary outgrowths, transverse differentiation, and anterior–posterior polarity. These reconstructed features include dorsoventral polarity, ciliated mucus-secreting epithelium underlain by a basal lamina, two rows of blind food-gathering pockets, absence of a through-gut, nervous system of diffusive type, axial support band and muscle fibres. Such a set of features indicates the affinity of Dickinsonia and Proarticulata as a whole (the only known Ediacaran Metazoa) to Urbilateria, a hypothetical ancestor of bilaterally symmetrical animals.
- Subjects
BASAL lamina; NERVOUS system; EDIACARAN fossils; PRECAMBRIAN; FOSSILS
- Publication
Earth & Environmental Science Transactions of the Royal Society of Edinburgh, 2023, Vol 114, Issue 1/2, p95
- ISSN
1755-6910
- Publication type
Article
- DOI
10.1017/S175569102300004X