Breeders have developed several different finnage and scale variations:
Veil tail - extended finnage length and non-symmetrical tail; caudal fin rays usually only split once; the most common tail type seen in pet stores.

Crown tail - fin rays are extended well beyond the membrane and consequently the tail can take on the appearance of a crown; also called fringetail
Comb tail - less extended version of the crown tail, derived from breeding crown and another finnage type
Half-moon - "D" shaped caudal fin that forms a 180° angle, the edges of the tail are crisp and straight
Over-half-moon or Super Delta tail - caudal fin is in excess of the 180° angle, byproduct of trying to breed half-moons, can sometimes cause problems because the fins are too big for the fish to swim properly
Rose tail - variation with so much finnage that it overlaps and looks like a rose
Feather tail - similar to the rose tail, with a rougher appearance
Plakat - short fins that resemble the fins seen in wild-type bettas
Half-moon plakat - short-finned half-moon; plakat and half-moon cross
Double tail or Full-moon - the tail fin is duplicated into two lobes and the dorsal fin is significantly elongated, the two tails can show different levels of bifurcation depending on the individual
Delta tail - tail spread less than that of a half-moon [<180]
Super Delta (aka SD or SDT for short) - are an enhanced version of the Delta.
They are one step closer to the Halfmoon variety in that their tails have a span between 130 -170 degrees
Half-sun - combtail with caudal fin going 180°, like a half-moon
Elephant ear - pectoral fins are much larger than normal, often white, resembling the ears of an elephant
Spade tail - caudal fin has a wide base that narrows to a small point
Breeders have developed several different finnage and scale variations:
Veil tail - extended finnage length and non-symmetrical tail; caudal fin rays usually only split once; the most common tail type seen in pet stores.
Crown tail - fin rays are extended well beyond the membrane and consequently the tail can take on the appearance of a crown; also called fringetail
Comb tail - less extended version of the crown tail, derived from breeding crown and another finnage type
Half-moon - "D" shaped caudal fin that forms a 180° angle, the edges of the tail are crisp and straight
Over-half-moon or Super Delta tail - caudal fin is in excess of the 180° angle, byproduct of trying to breed half-moons, can sometimes cause problems because the fins are too big for the fish to swim properly
Rose tail - variation with so much finnage that it overlaps and looks like a rose
Feather tail - similar to the rose tail, with a rougher appearance
Plakat - short fins that resemble the fins seen in wild-type bettas
Half-moon plakat - short-finned half-moon; plakat and half-moon cross
Double tail or Full-moon - the tail fin is duplicated into two lobes and the dorsal fin is significantly elongated, the two tails can show different levels of bifurcation depending on the individual
Delta tail - tail spread less than that of a half-moon [<180]
Super Delta (aka SD or SDT for short) - are an enhanced version of the Delta. They are one step closer to the Halfmoon variety in that their tails have a span between 130 -170 degrees
Half-sun - combtail with caudal fin going 180°, like a half-moon
Elephant ear - pectoral fins are much larger than normal, often white, resembling the ears of an elephant
Spade tail - caudal fin has a wide base that narrows to a small point
Siamese fighting fish