“Metazoan morphologies [animal fossil forms] are quite clumped—undispersed is the technical term—into clades [groups of organisms evolutionists think share a common ancestor] with unique body plans and with significant gaps in architectural style between them, and this pattern continues among classes within phyla and to some extent even among orders within classes”.
See more detail here: https://creation.com/fossils-not-overwhelming-evidence-for-evolution