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Fig. 21 | Frontiers in Zoology

Fig. 21

From: Support for a radiation of free-living flatworms in the African Great Lakes region and the description of five new Macrostomum species

Fig. 21

Micrographs of reproductive structures of field-collected Macrostomum gracilistylum. Brackets denote accessions of deposited specimens, with MTP LS 3547 being the HOLOTYPE. a Ripe testis (MTP LS 3551). b Ripe ovary, developing egg, and antrum with multiple sperm (MTP LS 3548). c Close-up of the ripe ovary, developing egg, and antrum with multiple sperm. Note the very similar arrangement to (b) (MTP LS 3551). d Overview of the male system with stylet, vesicula granulorum, and both seminal vesicles (MTP LS 3546). e Vesicula granulorum and base of stylet (MTP LS 3547). f Sperm next to a diatom, showing the sperm bristles and the terminal brush (MTP LS 3548). g Detail of the distal region of the stylet, showing the asymmetrical thickening and the remarkably narrow distal opening (MTP LS 3547). Scale bars indicate 20 μm

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Frontiers in Zoology

ISSN: 1742-9994