Macrostomum lewisi Fig 1-4.jpg

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The sperm cell is a thin filament with a small knobbed head containing granules. Setae are lacking in this cell. It is this present author's opinion that Okugawa has depicted an immature sperm cell. p. 205

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith