Plakat Betta

The Plakat, or Plakad, is a short-tailed Betta, and is the most closely related to wild Betta splendens or traditional fighting Bettas. Plakats can often be mistaken for female Bettas to the untrained eye, however, males will display elongated ventral fins, a rounded caudal fin and a sharply pointed anal fin. There are 3 sub-categories related to this tail type. There is the traditional Plakat where the tail is rounded, sometimes with a point. Traditional plakats will have two rays. Halfmoon plakats (HMPK) are the modern, show type plakat, and they have four or more rays with 180 degree tail. Hmpks come in asymmetrical (More common. Elongated, slanted anal fin is the main defining characteristic. See picture.) and symmetrical (should look like modern halfmoon with proper form, but with shorter fins).

Plakats are more resistant to fin rot and other fin ailments, and will not bite their fins unlike types with long tails. This makes them more desirable for some hobbyists.

(Taken from here)