First published in May, 1953 of the Aquarium journal (Volume XXII, No.5), the article is sought and shared by Mr. Robert Ellermann to the hobby. The article mentioned about a variant of lyretail swordtail, which developed a "true" upper sword at caudal fin. Unfortunately, the strain has never been established. Different from Kings lyre and Common lyretail, there's only the extension of upper caudal fin rays in Double sword variant (all other fins were not elongated). While common lyretail trait shows up in early juvenile age, both Double sword and Kings lyre traits proceed to express after sexual maturation. In general, the double sword phenotype seems to have longer and thicker upper sword than in Kings lyre. So, you shouldn't mistake a double sword swordtail to those common fin individual carrying a pseudo sword which would not breed true at all. For further reference:
The Double swordedtail @ platys.net
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