Figure 8From: Plectus - a stepping stone in embryonic cell lineage evolution of nematodesPhylogeny and development. Phylogenetic tree of nematodes ([19], modified [17]) comprising 12 clades. In the 23 studied members of clades 7 to 12, an invariant monomorphic development of S1 descendants was found, while all five representatives of clade 6 follow a variable polymorphic pattern. Based on these findings and additional data referenced in the text, a separation of ‘Chromadorea’ into ‘Rhabditia’ and ‘Chromadoria’ is supported.Back to article page