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Investigation of the intestinal spherocrystals of different Cephalobaenida (Pentastomida)

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Abstract

The midgut cells of cephalobaenid pentastomids contain spherocrystals varying in size and appearance between the genera. Iron was detected in the vicinity of the crystals in all three genera, being considerably fainter inReighardia sternae than in the other species. Ultrastructurally a distinct lamination of the spherocrystals was evident, being faint inR. sternae but clearly expressed inRaillietiella hemidactyli andCephalobaena tetrapoda. According to the species, their diameter ranged from 1.3 to 6.25 μm. The size and number of the crystals were highest inR. hemidactyli and lowest inR. sternae. The inclusions were formed in the endoplasmic reticulum and migrated toward the cellular apex, accumulating there and being expelled into the midgut lumen. As determined by energy-dispersive X-ray analysis, calcium turned out to be the main component of the crystals. Furthermore, small amounts of chlorine and iron could be traced in the crystals. The relevance of the crystals is regarded as a kind of storage excretion such as that present in many other arthropods.

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  1. Arbeitsgruppe Parasitologie, Zoologisches Institut der Universität, Olshausenstrasse 40, D-24098, Kiel, Germany

    G. Thomas & W. Böckeler

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  1. G. Thomas
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  2. W. Böckeler
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Thomas, G., Böckeler, W. Investigation of the intestinal spherocrystals of different Cephalobaenida (Pentastomida). Parasitol Res 80, 420–425 (1994). https://doi.org/10.1007/BF00932380

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  • DOI: https://doi.org/10.1007/BF00932380

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