Pleuropodial extension (left figure) and pleuropodial sheath (right figure) in the embryo of viviparous Hesperoctenes fumarius (Heteroptera) (after Hagan 1931, 1951).

 
 
  Part of: Gavrilov-Zimin IA (2021) Egg retention, viviparity and ovoviviparity in Paraneoptera. Comparative Cytogenetics 15(3): 239-252. https://doi.org/10.3897/CompCytogen.v15.i3.70216