Table 1. Information on the cnidarian sequence resources used in this study.

Non-symbiotic refers to species that do not form symbioses with dinoflagellates. Aposymbiotic refers to species that do form symbioses but the material from which the sequencing was performed did not contain symbionts.

Organism	Developmental stage	Symbiotic state	Data type	Reference
Nematostella vectensis	Larvae	Non-symbiotic	Genome	Putnam et al. (2007)
Anthopleura elegantissima	Adult	Aposymbiotic	Transcriptome	Kitchen et al. (2015)
Aiptasia pallida	Adult	Aposymbiotic	Transcriptome	Lehnert, Burriesci & Pringle (2012)
Aiptasia pallida	Adult	Aposymbiotic	Genome	Baumgarten et al. (2015)
Acropora digitifera	Sperm	Aposymbiotic	Genome	Shinzato et al. (2011)
Acropora millepora	Adult and larvae	Symbiotic	Transcriptome	Moya et al. (2012)
Fungia scutaria	Larvae	Aposymbiotic	Transcriptome	Kitchen et al. (2015)