Spermatogenesis and Spermatozoa in Stygocapitella subterranea (Annelida, Parergodrilidae), an Enigmatic Supralittoral Polychaete

@article{Purschke2005SpermatogenesisAS,
  title={Spermatogenesis and Spermatozoa in Stygocapitella subterranea (Annelida, Parergodrilidae), an Enigmatic Supralittoral Polychaete},
  author={G{\"u}nter Purschke and Mary C. Fursman},
  journal={Zoomorphology},
  year={2005},
  volume={124},
  pages={137-148}
}
The intertidal polychaete species Stygocapitella subterranea (Parergodrilidae) is characterised by extraordinary biology and morphology, resembling those of clitellates and Hrabeiella periglandulata, a terrestrial species of Annelida. An ultrastructural study of the spermatogenesis and spermatozoa was undertaken to elucidate whether these similarities might exhibit adaptive characters typical of annelids with highly derived reproductive modes. A second goal was to find out whether there are… 

Male genital organs in the eulittoral meiofaunal polychaete Stygocapitella subterranea (Annelida, Parergodrilidae): ultrastructure, functional and phylogenetic significance

The observations confirm that consistencies with either clitellates or H. periglandulata are the result of convergent evolutionary events and the relationship of Parergodrilidae to an orbiniid/questid clade receives support from the present data.

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Detailed analysis of the male reproductive system in a potential bio-indicator species – The marine invertebrate Galeolaria caespitosa (Polychaeta: Serpulidae)

The independence of spermatogenic cells from supporting cells in G. caespitosa raised the possibility of inducing spermiogenesis in vitro, which would provide a useful tool to dissect the mechanisms underlying this complex cell differentiation process in invertebrates and other higher order animals.

Ultrastructure developments during spermiogenesis in Polydora ciliata (Annelida: Spionidae), a parasite of mollusca

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