Deltas (D) & Super Deltas (SD) Betta

    Deltas (or "D") and Super Deltas (or "SD") are very similar to HM's but have less than a 180 spread when flared. Super Deltas are nearly an HM but not quite, Deltas are far less than an HM. Deltas and Super Deltas are differentiated from Veil Tails by the fact that if you drew a line from the nose to the tip of the caudal fin, on a Delta or Super Delta there would be an equal amount of fin on either side of the line, whereas on a Veil Tail there would be little tail at the top, and the majority below. 

     A Delta tail is the right name for any single tailed non-Halfmoon Betta. A non-Halfmoon is when the tail has straight caudal edges just like a Halfmoon, but they don’t reach 180 degrees.