Folia Parasitologica, vol. 56 (2009), issue 1

Folia Parasitologica 56[1] 6-12 (2009) | 10.14411/fp.2009.002

The life cycle of Myxobolus lentisuturalis (Myxozoa: Myxobolidae), from goldfish (Carassius auratus auratus), involves a Raabeia-type actinospore

Monica Caffara1, Elena Raimondi1, Daniela Florio1, Federica Marcer2, Francesco Quaglio3, Maria Letizia Fioravanti1
1 Department of Veterinary Public Health and Animal Pathology, Alma Mater Studiorum University of Bologna, via Tolara di Sopra 50, 40064 Ozzano Emila (Bologna), Italy
2 Department of Experimental and Veterinary Sciences, University of Padova, Agripolis - Viale dell'Università 16, 35020 Padova, Italy
3 Department of Public Health, Comparative Pathology and Veterinary Hygiene, University of Padova, Agripolis - Viale dell'Università 16, 35020 Padova, Italy

We studied a natural infection of the oligochaete Branchiura sowerbyi Beddard, 1892 with the Raabeia-type actinosporean stage of Myxobolus lentisuturalis Dyková, Fiala et Nie, 2002 which infected goldfish Carassius auratus auratus (L.) in Italy, using molecular analysis of the SSU rRNA gene. The existence of intraoligochaete development shows that this parasite follows the life-cycle pattern described by Wolf and Markiw (1984) for Myxobolus cerebralis. Histological examinations of the goldfish infected by M. lentisuturalis showed at low magnification the presence of two bilateral crescent-shaped masses in the dorsal epaxial muscle. These lesions were not circumscribed, presented irregular edges and infiltrated the underlying bundles of skeletal muscle and interstitial tissue. At higher magnification, disappearance of muscle fibres and substitution of the muscle tissue with Myxobolus spores and plasmodia were observed.

Keywords: Myxosporea, Myxobolus lentisuturalis, actinospore, Raabeia-type, life cycle, Carassius auratus auratus, Branchiura sowerbyi, Italy

Received: June 17, 2008; Accepted: November 11, 2008; Published: March 1, 2009


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