stylet shaft with one turn
Macrostomum tuba Fig 13.jpg
The distal part of the stilette is slightly curved and has an expanded termination which is split in two parts. p. 128
Macrostomum vejdovskyi Fig 15-17.jpg
Macrostomum timavi Fig 12.jpg
Macrostomum saifunicum Fig 1-5.jpg
Macrostomum megalogastricum Fig 30-31.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
Macrostomum pseudoobtusum Fig 32.jpg
The inadequate description of the male genital system, and the failure to have observed the female system in the single specimen found constitutes reasons for placing the species of PEREYASLAWZEWA under the category of species dubiae. p. 144
Macrostomum tennesseensis Fig 7-10.jpg
Macrostomum virginianum Fig 18-24.jpg
The penis-stilette is unusually small for an animal of this size. It measures 35micro in length. Morphologically, the stilette is a simple, curved, funnel-like tube with a sub-terminal opening which is subtended by the pointed end. The sperm-cell is spindle-shaped. Two setae are present and there is a very large undulating 'Mittelrippe' on the mid-line of the surface of the cell extending from feeler to 'tail'. Chromatin material is not visible in this sperm-cell. p. 132/133