Paraxial organ of a scorpion: structural and ultrastructural studies of Euscorpius tergestinus paraxial organ (Scorpiones, Euscorpiidae)

@article{Lauti2008ParaxialOO,
  title={Paraxial organ of a scorpion: structural and ultrastructural studies of Euscorpius tergestinus paraxial organ (Scorpiones, Euscorpiidae)},
  author={Nicol{\'e} Lauti{\'e} and Lydia Soranzo and Marie-Claire Lajarille and Roland Stockmann},
  journal={Invertebrate Reproduction \& Development},
  year={2008},
  volume={51},
  pages={77 - 90}
}
Summary By combining ultrastructural and histochemical approaches, the paraxial organs of Euscorpius tergestinus (syn. E. carpathicus; Scorpiones, Euscorpiidae) have been studied for the first time. The paraxial organs are symmetrical structures in the male genital system. They are located on each side of the mesosoma and end at the genital aperture. The paraxial organs have a glandular function. They are directly involved in the secretion of the two hemispermatophores, which are deposited in… 
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The ultrastructure of book lung development in the bark scorpion Centruroides gracilis (Scorpiones: Buthidae)

There are differences and similarities in the formation of book lung and book gill lamellae and the homology hypothesis for these respiratory organs is supported or not supported depending on which developmental features are emphasized.

Ultrastructure of book gill development in embryos and first instars of the horseshoe crab Limulus polyphemus L. (Chelicerata, Xiphosura)

The developmental observations herein and in an earlier study of scorpion book lungs show that the lamellae in book gills and book lungs result from some similar activities and features of the precursor epithelial cells: proliferation, migration, alignment and apical/basal polarity with secretion of cuticle from the apical surface and the basal surface in contact with hemolymph.

Evolutionary morphology of the hemolymph vascular system in scorpions: a character analysis.

Book gill development in embryos and first and second instars of the horseshoe crab Limulus polyphemus L. (Chelicerata, Xiphosura).

  • R. Farley
  • Biology
    Arthropod structure & development
  • 2010

Testes Mass, but Not Sperm Length, Increases with Higher Levels of Polyandry in an Ancient Sex Model

As predicted by the sperm competition theory and according to what happens in other arthropods, testes mass increased in species with higher levels of sperm competition, and influenced positively spermatophore volume, but data was not conclusive for sperm length.

Successive matings produce opposite patterns on ejaculate volume and spermatozoa number in an ancient arthropod model with indirect sperm transfer

The production of spermatophore and ejaculate is energetically expensive for males. High mating rates may accelerate sperm depletion and progressively decrease the size of the ejaculates. Sperm…

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