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Table 1.

Brachyhypopomus pinnicaudatus oogenesis

StageDiameter (μm)NucleusNucleoliCytoplasmChorion
Oogonia 5—13 Spherical, central Scarce — 
  Fibrillar chromatin    
Previtellogenic oocyte 20—175 Spherical, central Several Strongly basophilic — 
  Fibrillar chromatin Close to nuclear membrane   
  Lampbrush chromosomes    
Lipid yolk oocyte 165—550 Usually deformed, central Several, small Basophilic Starts deposition 
  Fine chromatin  Foamy lipid droplets  
Protein yolk oocyte 500—850 Usually deformed, central Several, small Peripheric lipid yolk  
  Fine chromatin  Perinucleus protein yolk Continues deposition 
Fully grown oocyte 800—1250 Usually deformed, central Several, small Abundant protein yolk Continues and completes deposition 
  Fine chromatin  Scarce and peripheric lipid yolk  
StageDiameter (μm)NucleusNucleoliCytoplasmChorion
Oogonia 5—13 Spherical, central Scarce — 
  Fibrillar chromatin    
Previtellogenic oocyte 20—175 Spherical, central Several Strongly basophilic — 
  Fibrillar chromatin Close to nuclear membrane   
  Lampbrush chromosomes    
Lipid yolk oocyte 165—550 Usually deformed, central Several, small Basophilic Starts deposition 
  Fine chromatin  Foamy lipid droplets  
Protein yolk oocyte 500—850 Usually deformed, central Several, small Peripheric lipid yolk  
  Fine chromatin  Perinucleus protein yolk Continues deposition 
Fully grown oocyte 800—1250 Usually deformed, central Several, small Abundant protein yolk Continues and completes deposition 
  Fine chromatin  Scarce and peripheric lipid yolk  

Female germ cells were classified according to their size and main morphological characteristics.

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