首页 | 本学科首页   官方微博 | 高级检索  
     


Ultrastructure of epidermal eyespots of Microstomum lineare (Turbellaria,macrostomida)
Authors:Irmeli Palmberg  Maria Reuter  Marianne Wikgren
Affiliation:(1) Institute of Biology, Åbo Akademi, 20500 Åbo 50, Finland
Abstract:
Summary The eyespots of Microstomum lineare were studied by electron microscopy, light microscopy, and fluorescence microscopy. Each eyespot consists of two ciliary photoreceptor cells shielded by pigment cells and additional sensory cells. The photoreceptor cells are characterized by a distal intracellular cavity lined with 50–100 interwoven cilia. The other sensory cells are of two ultrastructurally different types, one with long cilia predominating and the other with balloonlike cilia. The pigment cells, which envelop processes of the sensory cells, contain pigment vacuoles varying in size and content and give a bright red fluorescence by the Falck-Hillarp method. The eyespots are suggested to perform a dual function as photoreceptors and chemoreceptors. The evolutionary significance of ciliary photoreceptors in Turbellaria is discussed.
Keywords:Eyespots  Photoreceptor  Chemoreceptor  Turbellaria  Ultrastructure
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号