Conserved synteny blocks. Each synteny block represents a set of mapped coral markers and their best matches in another metazoan genome. Synteny blocks were defined as groups of at least three markers, each of which was ≤10 cM from its nearest neighbor within a linkage group in the coral map, and for which the best matches in another genome were also each ≤10 Mb from their nearest neighbors in the same chromosome or scaffold. All blocks shown here contain more markers than expected from chance (P < 0.05) based on permutation analysis (n = 1,000). For each block, the coral linkage group is shown as a white horizontal bar, with syntenic marker positions (in cM) indicated on the bar. For each linkage group containing a synteny block, each comparison with the other genome is shown as a horizontal grey bar, with marker positions (in Mb) indicated on the bar. Relationships between coral markers and other genomes, based on sequence similarity (tblastx, bit-score ≥50), are indicated by diagonal lines connecting each coral marker with its best match.