Hydra nematocysts in the flatworm Microstomum lineare: in search for alterations preceding their disappearance from the new host

  title={Hydra nematocysts in the flatworm Microstomum lineare: in search for alterations preceding their disappearance from the new host},
  author={Georg Krohne},
  journal={Cell and Tissue Research},
  • G. Krohne
  • Published 17 December 2019
  • Medicine, Biology
  • Cell and Tissue Research
Nematocysts are characteristic organelles of the phylum Cnidaria. The free-living Platyhelminth Microstomum lineare preys on Hydra oligactis and sequesters nematocysts. All nematocyst types become phagocytosed without adherent cytoplasm by intestinal cnidophagocytes. Desmoneme and isorhiza nematocysts disappear within 2 days after ingestion whereas cnidophagocytes containing the venom-loaded stenotele nematocysts migrate out of the intestinal epithelia through the parenchyma to the epidermis… Expand


Organelle survival in a foreign organism: Hydra nematocysts in the flatworm Microstomum lineare.
  • G. Krohne
  • Medicine, Biology
  • European journal of cell biology
  • 2018
The ability of epidermal stenotele nematocysts to discharge suggest that this hydra organelle preserved its physiological properties in the new host. Expand
Incorporated nematocysts in Aeolidiella stephanieae (Gastropoda, Opisthobranchia, Aeolidoidea) mature by acidification shown by the pH sensitive fluorescing alkaloid Ageladine A.
A fluorescence staining method is presented that detects changes in the pH values of incorporated nematocysts, interpreted as changes in maturation stages and shows that kleptocnides indeed change their pH value after incorporation into the aeolidoidean cnidosac. Expand
Ingestion of a medusa (Aegina citrea) by the nematocyst-containing ctenophore Haeckelia rubra (formerly Euchlora rubra): phylogenetic implications
The rare ctenophore Haeckelia rubra (formerly Euchlora rubra) has long been known to have nematocysts rather than colloblasts in its tentacles, but it is found that H. rubra readily eats the tentacles of a medusa, Aegina citrea, whose nem atocysts (apotrichous isorhizas) are nearly identical in morphology to the nematocrysts of the ctenophile. Expand
Bau und Funktion des Cnidosacks der Aeolidoidea (Gastropoda Nudibranchia)
The cnidosac has been investigated in 14 species of Aeolidoidea from the Gulf of Naples and from Roscoff with the light microscope and in one species,Cratena peregrina, with the electron microscope to study the morphology and arrangements of nematocysts and nematophages. Expand
The utilization of cnidarian nematocysts by aeolid nudibranchs: nematocyst maintenance and release in Spurilla.
Nematocysts are not subjected to lysosomal enzymes because any phagocytic membrane that surrounded the nematocyst after engulfment does not persist and may aid in the maintenance and development of the nematography. Expand
The morphogenesis of nematocytes in Hydra and Forskålia: an ultrastructural study.
  • T. Holstein
  • Biology, Medicine
  • Journal of ultrastructure research
  • 1981
Nematocyte development overall is characterized by a close correlation between the formation of the nematocyst and theformation of the sensory apparatus. Expand
Comparative morphology and evolution of the cnidosac in Cladobranchia (Gastropoda: Heterobranchia: Nudibranchia)
This study describes cnidosac morphology across the main groups of Cladobranchia in which it occurs, and places variation in its structure in a phylogenetic context to better understand the evolution of nematocyst sequestration. Expand
Sequestration of nematocysts by divergent cnidarian predators: mechanism, function, and evolution
A generalized working model for the steps that may lead to the evolution of nematocyst sequestration is proposed and discussed to discuss important areas for future research. Expand
Morphology and morphodynamics of the stenotele nematocyst of Hydra attenuata Pall. (Hydrozoa, Cnidaria)
The structure, the morphodynamics of discharge, and the impact of the stenotele cyst of Hydra attenuata (Hydrozoa, Cnidaria) on the prey's integument are investigated. Expand
A guideline to nematocyst nomenclature and classification, and some notes on the systematic value of nematocysts*
Cnidocyst nomenclature is based on the structure of the tubule and its armature as viewed in the light microscopy (LM) but some errors in the interpretation of the fine structure of tubules and armature of nematocysts have been revealed. Expand