Abstract. In this paper we present a new way of constructing almost phylogenetic trees. Almost since we reconstruct the tree, but without the timestamps. Rather than basing the tree on genetic sequence data ours is based on developmental sequence data. Using frequent episode discovery and clustering we reconstruct the consensus tree from the literature almost completely.

We introduce a new method for the analysis of heterochrony in developmental biology. Our method is based on methods used in data mining and intelligent data analysis and applied in, e.g., shopping basket analysis, alarm network analysis and click stream analysis. We have transferred, so called, frequent episode mining to operate in the analysis of developmental timing of different (model) species. This is accomplished by extracting small temporal patterns, i.e. episodes, and subsequently comparing the species based on extracted patterns. The method allows relating the development of different species based on different types of data. In examples we show that the method can reconstruct a phylogenetic tree based on gene-expression data as well as using strict morphological characters. The method can deal with incomplete and/or missing data. Moreover, the method is flexible and not restricted to one particular type of data: i.e., our method allows comparison of species and genes as well as morphological characters based on developmental patterns by simply transposing the dataset accordingly. We illustrate a range of applications.

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