Fig. 1From: Distant hybrids of Heliocidaris crassispina (♀) and Strongylocentrotus intermedius (♂): identification and mtDNA heteroplasmy analysisRate of success at each developmental stage in Heliocidaris crassispina purebred offspring, Strongylocentrotus intermedius purebred offspring, and H. crassispina (♀) × S. intermedius (♂) hybrids. HC_F: Purebred offspring of the H. crassispina Fujian population; SI_C: Purebred offspring of the S. intermedius cultured population; HS: H. crassispina (♀) × S. intermedius (♂) hybrids. “**” indicates an extremely significant difference (P < 0.01) between the two groups connected by the lineBack to article page