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Cyclic occurrence of gregarine trophozoites (Apicomplexa) in the burrowing echinoid Echinocardium cordatum (Echinodermata, Spatangoidea)
Coulon, P.; Jangoux, M. (1991). Cyclic occurrence of gregarine trophozoites (Apicomplexa) in the burrowing echinoid Echinocardium cordatum (Echinodermata, Spatangoidea). Dis. Aquat. Org. 12(1): 71-73. dx.doi.org/10.3354/dao012071
In: Diseases of Aquatic Organisms. Inter Research: Oldendorf/Luhe. ISSN 0177-5103, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Coulon, P.
  • Jangoux, M., more

Abstract
    The occurrence of the gregarine Urospora neapolitana in the spatangoid echinoid Echinocardium cordatum was followed monthly over a 1 yr period. Infesting stages (sporozoites) were seen only in the digestive cells of the hosts' gastric caecum while growing stages (trophozoites) only occurred in the hosts' body cavity. Sporozoites showed no variation in abundance over the investigated period. The number of trophozoites, however, clearly varied with a minimum in summer and early autumn. Trophozoite variation appears to be related to the gonadal cycle of the host.

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