Fig. 1.

Maximum likelihood phylogeny of Asteroidea mitochondrial genomes (solid lines) with Echinoidea as outgroup (dotted lines) (left) and mitochondrial initiation codons arranged in gene order (right). Values on nodes represent maximum likelihood bootstrap (≥50)/posterior probability (≥0.90) values. Samples sequenced in this study are in bold. ^Two Goniodiscaster scaber samples pooled into a single terminal. *^/#Annotated as ATT and ATA respectively in GenBank but corrected to ATG (see main text for details). ⁺Possible novel initiation codon but inconclusive (see main text for details). ^$See Data availability.