Ontogeny of the complex sperm in the macrostomid flatworm Macrostomum lignano (Macrostomorpha, Rhabditophora)

• DOI: 10.1002/jmor.10675
• Publication Date: 2008-09-16T19:16:46Z
• Authors: Maxime Willems; Frederic Leroux; Myriam Claeys; Mieke Boone; Stijn Mouton; Tom Artois; Gaëtan Borgonie
• Keywords: Bristle; Flatworm; Spermiogenesis

Abstract Spermiogenesis in Macrostomum lignano (Macrostomorpha, Rhabditophora) is described using light‐ and electron microscopy of the successive stages sperm development. Ovoid spermatids develop to highly complex, elongated possessing an undulating distal (anterior) process (or “feeler”), bristles, a proximal (posterior) brush. In particular, we present detailed account morphology ontogeny describing for first time formation specialized bristle complex consisting several parts. This ultimately reduced when are mature. The implications development this on both maturation evolution function bristles discussed. assumed homology between flagellae questioned. J. Morphol., 2009. © 2008 Wiley‐Liss, Inc.