stylet tip thickening unclear
Macrostomum glochistylum Fig 13-19.jpg
The small reniform eyes are not embedded in the tissues of the ganglia. The penis-stilette is a long, curved funnel which extends from a widened proximal base to end in a slightly bent obliquely truncated terminus. The stilette termination is distinctly provided with a thin lip which projects slightly beyond the opening proper. p. 195 The sperm cell in this form is a spindler-shaped structure which is much shorter than usual for Macrostomum. Chromatin granules are present in the anterior region of the cell, while posteriorly directed setae are absent. p. 196
Macrostomum lineare Fig 5.jpg
The penis-stilette is a lengthy, tubular structure containing two right angle bends in its main axis. The basal proximal rim is dentate. The enlarged end is quite asymmetrical in that one side wall is always longer and larger than the other one. The sperm cell has a feeler, a conspicuous anterior swelling, lateral paired setae, but lacks a definite tail region. This cell lacks observable chromatin granules. p. 275
Macrostomum reynoldsi Fig 21-25.jpg
Macrostomum viride Fig 25-26.jpg
Macrostomum timavi Fig 12.jpg
Macrostomum hystrix Fig 28.jpg
The penis-stilette has a rather narrow crenated base, a wider middle portion and presents a gradual curve from the base to the hooked and sharply pointed end in which the opening is located. p. 47