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There are many different tail shapes that newcomers to the Betta world have no idea what they are missing. Most of us have been enchanted by the beauty of the Pet Store betta we were first introduced to. It escalated from there. Only then do we start to research, look online and then lo and behold we see another Betta that captivates us. It is different for each person, but there is some betta out there to captivate each person. They are amazed by the amazing finnage never before seen by them. Here are some examples of those other fin shapes. 
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Tail Example Descriptions
Veil (VT) Most common tail shape. Found commonly in Pet Stores. This tail is the longest of the tail, but is not the fullest. Although this tail is not sought after by breeders, it still is a very beautiful tail.
Delta (D) One of the most beautiful tail types. There are a few variations of this tail type. A regular Delta Tail is the tail shape pictured. It has long, straight rays, from the first ray to the last. The spread is wider than the veil. Where the veil will generally round of at the end, with shorter outer rays. The Delta tail will have long rays, and the spread will widen near the outer edge of the caudal.
Super Delta(SD) This tail goes even farther than the Delta, it is even longer, and fuller. In my experience, the Ultra Delta tails will remain open and spread nearly at all times. This one pictured is still young, he is Half Moon geno and his caudal remains spread at all times. His spread is approximately 150
Half Moon (HM) Picture Courtesy of Betta Bunnies This tail is one of the most sought after tail shape. No breeder knows the exact genealogy of the Half Moon, and if they do, they are good at keeping a secret. A Half Moon is a Delta Tail with a full 180 spread. There are a few characteristics that also must be met to be considered a True Half Moon. The first and the last rays of the caudal fin must be straight. They must also be as long as the other rays of the other rays. A true Half Moon is indeed rare, and hard to come by. If you were to breed a male Half moon to a female Half Moon, you still might only get a very small handful of true Half Moons in the spawn. You will get a nice spawn of Deltas or ultra deltas. Also, there are many Half Moon "genos" floating around out there. Please be aware that no one really knows how to create a Half Moon. Photo/Fish courtesy of Betta Bunnies.
Rose or Feather These have excessive branching giving the tail a ruffled or feathered look.
Crown This tail is an extreme comb tail, with the width of a Delta or Fan tail. A Crown Tail can either be single ray or double ray. A double Ray is pictured. The rays extend beyond the webbing of the fins and are equal in length. This is a very impressive fin formation that has only recently been introduced to the United States courtesy of Henry Yin. 
Comb This tail is not really a tail shape, more so than it is a characteristic of a tail. A comb tail is a ragged appearance and can occur on any tail shape from veil to Half Moon. This picture was scanned from a betta book.
Fan This Tail is much like the Delta, but as far as I can tell, the difference is that the outer rays are not as long as in the Delta Tail. The spread is wide, like the Delta.
Double In the Double Tail, the tail splits at the base of the tail creating two distinctive tail lobes. This is a recessive gene. A deep split all the way to the base is very desirable. Also, good even tail lobes are also very desirable. 
Round Picture courtesy of Angie Robinson This is very common in the wild type of betta. Although it is also is found in the long finned Splendens. It is full as in the fan or Delta tail, the difference is the outer rays curve into a rounded shape. Photo/Fish courtesy of Angie's Betta Aquaria
Pin This tail is the shape of a fan or delta tail, but the farthest most edge of

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Last update:
  March 23, 2009 10:27 PM CST Pet Sites

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