Table 1.

Species and strains from MMETSP transcriptomes in which MGD, SQD1, and SQD2 homologs were found. Colors refer to taxonomic ranks as in Figure 2. P = presence of validated gene homologs.

Color Legend	Taxonomic Group	Species/Strain Surveyed	Accepted Synonym	MGD	SQD1	SQD2
	Dinophyceae	Alexandrium monilatum CCMP3105		P	P	P
	Dinophyceae	Alexandrium tamarense CCMP1771		P	P
	Dinophyceae	Amphidinium carterae CCMP1314		P
	Bacillariophyta	Amphiprora sp.		P	P	P
	Bacillariophyta	Amphora coffeaeformis CCMP127	Halamphora coffeiformis	P	P	P
	Bacillariophyta	Asterionellopsis glacialis CCMP134		P	P	P
	Pelagophyceae	Aureococcus anophagefferens CCMP1850		P		P
	Pelagophyceae	Aureoumbra lagunensis CCMP1510		P	P	P
	Dinophyceae	Azadinium spinosum 3D9		P
	Bacillariophyta	Ceratium fusus PA161109	Tripos fusus	P
	Bacillariophyta	Chaetoceros affinis CCMP159		P	P	P
	Bacillariophyta	Chaetoceros curvisetus		P	P	P
	Bacillariophyta	Chaetoceros debilis MM31A 1		P	P	P
	Bacillariophyta	Chaetoceros neogracile CCMP1317		P	P	P
	Raphidophyceae	Chattonella subsalsa CCMP2191		P	P	P
	Coccolithophyceae	Chrysochromulina polylepis CCMP1757	Prymnesium polylepis	P	P	P
	Bacillariophyta	Corethron pennatum L29A3		P	P	P
	Dinophyceae	Crypthecodinium cohnii Seligo		P
	Bacillariophyta	Ditylum brightwellii GSO103		P	P	P
	Bacillariophyta	Ditylum brightwellii GSO104		P	P	P
	Bacillariophyta	Ditylum brightwellii GSO105		P	P	P
	Chlorophyta	Dunaliella tertiolecta CCMP1320		P	P	P
	Dinophyceae	Durinskia baltica CSIRO CS 38	Durinskia dybowskii	P	P	P
	Coccolithophyceae	Emiliania huxleyi 374		P		P
	Coccolithophyceae	Emiliania huxleyi 379		P	P	P
	Coccolithophyceae	Emiliania huxleyi CCMP370		P	P	P
	Coccolithophyceae	Emiliania huxleyi PLYM219		P	P	P
	Euglenophyceae	Eutreptiella gymnastica like CCMP1594		P		P
	Bacillariophyta	Extubocellulus spinifer CCMP396		P	P
	Bacillariophyta	Fragilariopsis kerguelensis L26 C5		P	P	P
	Bacillariophyta	Fragilariopsis kerguelensis L2 C3		P	P	P
	Coccolithophyceae	Gephyrocapsa oceanica RCC1303		P	P	P
	Dinophyceae	Glenodinium foliaceum CCAP1116 3	Kryptoperidinium foliaceum	P	P	P
	Glaucophyceae	Gloeochaete wittrockiana SAG46 84		P	P	P
	Cryptophyta	Goniomonas pacifica CCMP1869			P
	Raphidophyceae	Heterosigma akashiwo CCMP2393		P	P	P
	Raphidophyceae	Heterosigma akashiwo CCMP3107		P	P	P
	Raphidophyceae	Heterosigma akashiwo CCMP452		P	P	P
	Raphidophyceae	Heterosigma akashiwo NB		P	P	P
	Coccolithophyceae	Isochrysis galbana CCMP1323		P	P	P
	Coccolithophyceae	Isochrysis sp. CCMP1244		P	P	P
	Coccolithophyceae	Isochrysis sp. CCMP1324		P	P	P
	Dinophyceae	Karenia brevis CCMP2229		P
	Dinophyceae	Karenia brevis SP1		P
	Dinophyceae	Karenia brevis SP3		P
	Dinophyceae	Karenia brevis Wilson		P		P
	Dinophyceae	Karlodinium micrum CCMP2283	Karlodinium veneficum	P		P
	Dinophyceae	Kryptoperidinium foliaceum CCMP1326		P	P	P
	Dinophyceae	Lingulodinium polyedra CCMP1738		P	P
	Cercozoa	Lotharella globosa CCCM811		P	P	P
	Chlorophyta	Micromonas sp. CCMP2099		P
	Chlorophyta	Micromonas sp. NEPCC29		P	P
	Chlorophyta	Micromonas sp. RCC472		P	P	P
	Bacillariophyta	Nitzschia punctata CCMP561	Tryblionella punctata	P	P	P
	Chrysophyceae	Ochromonas sp. CCMP1393		P	P	P
	Dinophyceae	Oxyrrhis marina		P		P
	Dinophyceae	Oxyrrhis marina LB1974				P
	Pavlovophyceae	Pavlova sp. CCMP459		P	P	P
	Pelagophyceae	Pelagococcus subviridis CCMP1429		P
	Pelagophyceae	Pelagomonas calceolata CCMP1756		P	P	P
	Dinophyceae	Peridinium aciculiferum PAER 2	Apocalathium aciculiferum	P
	Chlorophyta	Picocystis salinarum CCMP1897			P
	Coccolithophyceae	Pleurochrysis carterae CCMP645	Chrysotila carterae	P		P
	Bacillariophyta	Proboscia alata PI D3		P	P	P
	Dinophyceae	Prorocentrum minimum CCMP1329	Prorocentrum cordatum	P	P
	Dinophyceae	Prorocentrum minimum CCMP2233	Prorocentrum cordatum	P	P
	Coccolithophyceae	Prymnesium parvum Texoma1		P	P	P
	Bacillariophyta	Pseudo-nitzschia australis 10249 10 AB		P	P	P
	Bacillariophyta	Pseudo-nitzschia fradulenta WWA7		P	P	P
	Dictyochophyceae	Pseudopedinella elastica CCMP716		P	P	P
	Dictyochophyceae	Pteridomonas danica PT		P	P	P
	Chlorophyta	Pyramimonas parkeae CCMP726		P	P	P
	Rhodophyta	Rhodella maculata CCMP736	Rhodella violacea	P	P
	Cryptophyta	Rhodomonas sp. CCMP768		P	P	P
	Dinophyceae	Scrippsiella hangoei SHTV5	Apocalathium malmogiense	P
	Dinophyceae	Scrippsiella hangoei like SHHI 4		P
	Dinophyceae	Scrippsiella trochoidea CCMP3099		P
	Bacillariophyta	Skeletonema dohrnii SkelB		P	P	P
	Bacillariophyta	Skeletonema marinoi SkelA		P	P	P
	Bacillariophyta	Skeletonema menzelii CCMP793		P	P	P
	Dinophyceae	Symbiodinium sp. C1		P
	Dinophyceae	Symbiodinium sp. CCMP2430		P
	Dinophyceae	Symbiodinium sp. Mp		P
	Chlorophyta	Tetraselmis striata LANL1001		P	P	P
	Bacillariophyta	Thalassionema nitzschioides L26 B		P		P
	Bacillariophyta	Thalassiosira antarctica CCMP982		P	P	P
	Bacillariophyta	Thalassiosira gravida GMp14c1		P	P	P
	Bacillariophyta	Thalassiosira miniscula CCMP1093		P	P	P
	Bacillariophyta	Thalassiosira oceanica CCMP1005		P	P	P
	Bacillariophyta	Thalassiosira rotula CCMP3096	Thalassiosira gravida	P	P	P
	Bacillariophyta	Thalassiosira rotula GSO102	Thalassiosira gravida	P	P	P
	Bacillariophyta	Thalassiosira weissflogii CCMP1010	Conticribra weissflogii	P	P
	Bacillariophyta	Thalassiosira weissflogii CCMP1336	Conticribra weissflogii	P	P	P
	Bacillariophyta	Thalassiothrix antarctica L6 D1		P	P
	Xanthophyceae	Vaucheria litorea CCMP2940		P	P	P