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Karyologic observations on the maturation of the summer and winter Eggs of Daphnia pulex and Daphnia middendorffiana
The cytological study of the maturation of summer and winter eggs of an italian population of this species has shown that both types of eggs undergo only one maturation division of equational type with the expulsion of only one diploid polar body. Expand
Parthenogenesis in the parasitic and free-living forms of Strongyloides papillosus (Nematoda, Rhabdiasoidea)
Both parasitic and free-living females of a calf strain of Strongyloides papillosus have a chromosome number of 2n=4. Both forms reproduce by diploid parthenogenesis. Oocytes of parasitic femalesExpand
Rudimentary hermaphroditism and automictic parthenogenesis inLimnadia lenticularis (Phyllopoda, Conchostraca)
È stata studiata una popolazione diLimnadia lenticularis costituita da individui con caratteristiche esterne femminili, ma con un apparato riproduttore ermafrodita.
Considerations on some cytological and ultrastructural observations on fat cells of Daphnia (Crustacea, Cladocera)
The fat cells of females of Daphnia obtusa have a well developed rough endoplasmic reticulum, free ribosomes and small Golgi complexes which could be explained by the fact that the fat cells synthesize little vitellogenin since the yolk of amphigonic oocytes is mostly endogenous. Expand
Ultrastructural investigations on the labral glands of Daphnia obtusa (Crustacea, Cladocera)
Since clear exocytotic phenomena were not observed, the secretion can be assumed to flow into the hemolymph after accumulation in the enlarged intercellular spaces. Expand
Occurrence of innervation in labral glands of Daphnia obtusa (crustacea, cladocera)
Electron microscopy discloses nerve endings in contact with gland cells situated in the labrum of Daphnia with respect to nerve fibers of different sizes and electron density. Expand
Labral Glands of Leptestheria Dahalacensis (Branchiopoda: Spinicaudata): An Ultrastructural Study
The results of the ultrastructural study are discussed in light of the data available on the labral glands of other copepod and branchiopod crustaceans. Expand
Electron microscopic study on oocytes, nurse cells and yolk formation in Leptestheria dahalacensis (Crustacea, Conchostraca)
Electron microscopic study of Leptestheria dahalacensis reveals that the oocyte and its three nurse cells are interconnected by intercellular bridges, and the nurse cells seem to be unable to incorporate protein yolk from the hemolymph. Expand
[Special aspects of intersexuality in Rana esculenta].
  • F. Zaffagnini
  • Biology, Medicine
  • Archivio italiano di anatomia e di embriologia…
  • 1968