Variability of mitochondrial ORFans hints at possible differences in the system of doubly uniparental inheritance of mitochondria among families of freshwater mussels (Bivalvia: Unionida)

Table 1 Summary of the newly sequenced species and their mt genomes

Family	Species	Country	Latitude	Longitude	Sexual system	GenBank accession numbers
Family	Species	Country	Latitude	Longitude	Sexual system	non-DUI	F	M
Iridinidae	Chambardia rubens	Mauritania	16.33880	−11.97809	dioecious	MK761138
Mulleriidae	Anodontites elongata	Brasil	−14.67936	−56.23611	dioecious	MK761136
	Fossula fossiculifera	Brasil	−14.67936	−56.23611	dioecious	MK761140
	Lamproscapha ensiformis	Brasil	−16.00573	−55.90867	unknown	MK761141
	Monocondylaea parchappii	Brasil	−14.67936	−56.23611	hermaphroditic	MK761142
Hyriidae	Castalia ambigua	Brasil	−14.67936	−56.23611	dioecious	MK761137
	Diplodon suavidicus	Brasil	−6.018083	−60.194306	unknown	MK761139
	Prisodon obliquus	Brasil	−6.018083	−60.194306	unknown	MK761143
	Westralunio carteri	Australia	−33.30210	115.81770	dioecious		MK761145	MK761146
Margaritiferidae	Pseudunio auricularius	France	47.01710	0.56310	dioecious		MK761144

For each species for which at least one mt genome sequence was obtained in this study (either complete or largely complete), the respective family, and the provenance of the specimen(s) used for the sequencing (columns ‘Country’, ‘Latitude’, ‘Longitude’) are indicated, as well as the respective sexual system. For each mtDNA sequenced, its type is specified: non-DUI., mtDNA of dioecious or hermaphroditic species with no evidence of DUI presence or secondary loss; F and M, female- and male-transmitted mtDNAs of dioecious DUI species, respectively. The only available mtDNA of Pseudunio auricularius, a dioecious species for which no evidence of DUI has been produced yet (no M mtDNA sequence available yet), which carries an F-orf, has been considered as F for simplicity

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