Xiphophorus hellerii gonopodium structure

Description:

Description: English: Structure of the male gonopodium in Xiphophorus hellerii In adult swordtail males the anal fin forms a gonopodium (bracket, A). A naturally developed gonopodium with typical terminal structures that form distal lepidotrich segments (B) and a testosterone-induced gonopodium (24 days of testosterone treatment) (C); caudal is to the top and ventral to the left (B, C). Arrows indicate terminal structures. Abbreviations: C, claw; RA, ramus; TB, terminal blade; S, spine; TH, terminal hook. Scale bars: 500 µm. Date: 25 October 2013. Source: Offen N, Kang JH, Meyer A, Begemann G (2013) Retinoic Acid Is Involved in the Metamorphosis of the Anal Fin into an Intromittent Organ, the Gonopodium, in the Green Swordtail (Xiphophorus hellerii). PLoS ONE 8(10): e77580. doi:10.1371/journal.pone.0077580. Author: Offen N, Kang JH, Meyer A, Begemann G.