| Organs list | Localization | 
      
        | Systems | Organs | Image | On longitudinal sections | On  transverse sections | 
      
        | Respiratory | Gills |  |  |  | 
      
        | Pseudobranchs |  |  |  | 
      
        | Operculum |  |  |  | 
      
        | Vascular | Heart |  |  |  | 
      
        | Ventral aorta  |  | 
 |  | 
      
        | Postcardinal vein  |  | 
 |  | 
      
        | Portal vein  |  | 
 |  | 
      
        | Ductus Cuvier  |  | 
 |  | 
      
        | Digestive | Cavité buccopharyngée  |  |  |  | 
      
        | Oesophagus |  |  |  | 
      
        | Intestine |  |  | TS 12, TS 13 , TS 14 , TS 15 , TS 16 , TS 17 , TS 18 , TS 19 , TS 20 , TS 21 , TS 22 , TS 23 , TS 24 | 
      
        | Anus |  |  | 
 | 
      
        | Liver |  |  |  | 
      
        | Pancreas |  |  |  | 
      
        | Swimbladder |  |  | TS 14, TS 15 ,TS 16 , TS 17 , TS 18 , TS 19 , TS 20 , TS 21 , TS 22 , TS 23 , TS 24 | 
      
        | Urinary | Kidney |  |  |  | 
      
        | Ureter |  | 
 |  | 
      
        | Bladder |  |  | 
 | 
      
        | Urinary papilla  |  |  | 
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        | Reproductive | Ovary |  |  |  | 
      
        | Testis |  |  |  | 
      
        | Oviduct |  |  | 
 | 
      
        | Genital papilla  |  |  | 
 | 
      
        | Nervous | Brain |  |  |  | 
      
        | Spinal cord  |  |  | TS 9, TS 10 , TS 11 , TS 12 , TS 13 , TS 14 , TS 15 , TS 16 , TS 17 , TS 18 , TS 19 , TS 20 , TS 21 , TS 22 , TS 23 , TS 24 | 
      
        | Notochord |  |  | TS 9, TS 10 , TS 11 , TS 12 , TS 13 , TS 14 , TS 15 , TS 16 , TS 17 , TS 18 , TS 19 , TS 20 , TS 21 ,TS 22 , TS 23 , TS 24 | 
      
        | Sensory | Nostril |  |  |  | 
      
        | Inner ear  |  |  |  | 
      
        | Eye |  |  |  | 
      
        | Endocrin | Hypophysis |  |  | 
 | 
      
        | Thyroïd follicles  |  |  |  | 
      
        |  | Spleen |  |  |  | 
      
        | Thymus |  |  |  |