Ultrastructure of spermiogenesis and the spermatozoon of Helicometra fasciata [Digenea, Opecoelidae] a parasite of Labrus merula [Pisces, Teleostei]

• Autorzy: Levron C , Ternengo S , Marchand B
• Języki publikacji: EN

Abstrakty

EN

Spermiogenesis in Helicometra fasciata is characterized by an unusual flagellar rotation. Indeed, a rotation of the axonemes, higher than 90°, occurs. Nevertheless, the general pattern is the same as in the other digenean trematodes examined. The zone of differentiation presents striated rootlets associated with two centrioles, and an intercentriolar body. The nucleus and mitochondrion migrate in the median cytoplasmic process. An asynchronic proximo-distal fusion takes place. The mature spermatozoon possesses five regions and two axonemes with the 9 + ‘ 1 ’ pattern, nucleus, mitochondrion, glycogen granules and two bundles of parallel cortical microtubules. Despite these features, there are some other peculiarities that distinguish the spermatozoon of H.fasciata. A centriolar derivative and a lateral expansion were observed in the anterior region. To discuss the phylogenetic relationships, comparison is made with Opecoeloides furcatus, the only other opecoeloid for which the reproduction characters were described.

Słowa kluczowe

EN

parasite; Opecoelidae; Teleostei; Pisces; Labrus merula; spermatozoon; Helicometra fasciata; ultrastructure; Digenea; spermiogenesis

• Wydawca: -
• Czasopismo: Acta Parasitologica
• Rocznik: 2003
• Tom: 48
• Numer: 4
• Opis fizyczny: p.255-264,fig.,ref.

Twórcy

autor

Levron C

• Laboratoire Parasites et Ecosystemes Mediterraneens, Faculte des Sciences et Techniques, Universite de Corse, Campus Grossetti, F-20250 Corte, France

autor

Ternengo S

• Laboratoire Parasites et Ecosystemes Mediterraneens, Faculte des Sciences et Techniques, Universite de Corse, Campus Grossetti, F-20250 Corte, France

autor

Marchand B

• Laboratoire Parasites et Ecosystemes Mediterraneens, Faculte des Sciences et Techniques, Universite de Corse, Campus Grossetti, F-20250 Corte, France

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