Sipkova, L. and Levron, C. and Freeman, M. and Scholz, T. (2010) Spermiogenesis and spermatozoon of the tapeworm Parabothriocephalus gracilis (Bothriocephalidea): Ultrastructural and cytochemical studies. Acta Parasitologica, 55 (1). pp. 58-65.
Full text not available from this repository.Abstract
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.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | Eucestoda; Bothriocephalidea; Parabothriocephalus gracilis; spermiogenesis; spermatozoon; ultrastructure |
| Subjects: | Q Science > Q Science (General) |
| Depositing User: | Dr Mohd Faizal Hamzah |
| Date Deposited: | 02 Dec 2015 03:37 |
| Last Modified: | 02 Dec 2015 03:37 |
| URI: | http://eprints.um.edu.my/id/eprint/15036 |
Actions (login required)
 |
View Item |
