Fig. 4

Lineage-restricted shell matrix proteins selected for HCR in Crepidula atrasolea. Rows represent SMP orthogroups that were examined by HCR in C. atrasolea. They are ordered based on the taxonomic level to which they are found to be lineage-restricted (Metazoa-restricted, Gastropoda-restricted, and Crepidula-restricted). Columns depict counts of proteins per taxon with their order (tree depicted above columns) based on current understandings of their phylogenetic positions (Kocot et al. 2011; Laumer et al. 2015; Laumer et al. 2018; Cunha and Giribet 2019). Gray and white boxes indicate presence or absence of respective species within SMP orthogroups. Green boxes indicate the presence of a skeletal matrix protein in the given orthogroup