Spermiogenesis and spermatozoon of the tapeworm Parabothriocephalus gracilis [Bothriocephalidea]: Ultrastructural and cytochemical studies

• Autorzy: Sipkova L , Levron C. , Freeman M. , Scholz T.
• Języki publikacji: EN

Abstrakty

EN

Spermiogenesis and spermatozoon ultrastructure of the tapeworm Parabothriocephalus gracilis were described using transmission electron microscopy (TEM). Spermiogenesis is characterized by the formation of a zone of differentiation with two centrioles associated with striated rootlets, and an intercentriolar body between them. The two flagella undergo a rotation of 90° until they become parallel to the median cytoplasmic extension with which they fuse. Electron-dense material is present in the apical region of the zone of differentiation in the early stages of spermiogenesis. This electron-dense material is characteristic for the orders Bothriocephalidea and Diphyllobothriidea. The mature spermatozoon contains two axonemes of the 9 + ‘1’ trepaxonematan pattern, nucleus, parallel cortical microtubules and electron-dense granules of glycogen. The anterior extremity of the spermatozoon exhibits a single helical electron-dense crested body 130 nm thick. One of the most interesting features is the presence of a ring of cortical microtubules surrounding the axoneme. This character has been reported only for species of the order Bothriocephalidea and may be unique in this cestode group.

Słowa kluczowe

EN

spermiogenesis; spermatozoon; tapeworm; Parabothriocephalus gracilis; Eucestoda; Bithriocephalidea; ultrastructure; cytochemical study; transmission electron microscopy

• Wydawca: -
• Czasopismo: Acta Parasitologica
• Rocznik: 2010
• Tom: 55
• Numer: 1
• Opis fizyczny: p.58-65,fig.,ref.

Twórcy

autor

Sipkova L

• Biology Centre of the Academy of Sciences of the Czech Republic, Branisovska 31, 370 05 Ceske Budejovice, Czech Republic

autor

Levron C.

autor

Freeman M.

autor

Scholz T.

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