We present a morphological study of the two richest superclusters from the 2dF Galaxy Redshift Survey ( SCL126 , the Sloan Great Wall , and SCL9 , the Sculptor supercluster ) .
We use Minkowski functionals , shapefinders , and galaxy group information to study the substructure of these superclusters as formed by different populations of galaxies .
We compare the properties of grouped and isolated galaxies in the core region and in the outskirts of superclusters .

The fourth Minkowski functional V _ { 3 } and the morphological signature K _ { 1 } - K _ { 2 } show a crossover from low-density morphology ( outskirts of supercluster ) to high-density morphology ( core of supercluster ) at mass fraction m _ { f } \approx 0.7 .
The galaxy content and the morphology of the galaxy populations in supercluster cores and outskirts is different .
The core regions contain a larger fraction of early type , red galaxies , and richer groups than the outskirts of superclusters .
In the core and outskirt regions the fine structure of the two prominent superclusters as delineated by galaxies from different populations also differs .
The values of the fourth Minkowski functional V _ { 3 } show that in the supercluster SCL126 the population of early type , red galaxies is more clumpy than the population of late type , blue galaxies , especially in the outskirts of the supercluster .
In the contrary , in the supercluster SCL9 , the clumpiness of the spatial distribution of galaxies of different type and color is quite similar in the outskirts of the supercluster , while in the core region the clumpiness of the late type , blue galaxy population is larger than the clumpiness of the early type , red galaxy population .

Our results suggest that both local ( group/cluster ) and global ( supercluster ) environments are important in forming galaxy morphologies and colors ( and determining the star formation activity ) .

The differences between the superclusters indicate that these superclusters have different evolutional histories .