stylet shaft with one turn
Macrostomum phillipsi Fig 13-16.jpg
Macrostomum rhabdophorum Fig 26.jpg
Roughly crenated base. The termination is a very peculiar structure, three drawings of which are given better describe it (Fig. 22). Lateral, end, and dorsal views (a), (b), are shown. The sperm cell is a tapering filament which is possessed lateral setae in the posterior third of the cell. It is interesting note that the greatest number of sperm cells in this species is produced in the latter part of June, the warmest part of the summer in the Mountain Lake region. Also of interest is the fact that sperm is liberated in macerations of the animal will make attempts to penetrate the egg of the parent. The 'feeler' is a slowly undulating tactile organ as long as the sperm cell remains in the body of the animal, but it becomes a highly vibratile structure when in maceration. p. 289
Macrostomum ruebushi var shenandoahensis Fig 27-30.jpg
Macrostomum ruebushi var truncatum Fig 31-34.jpg
The penis-stilette is a funnel with a crenate base which is slightly obliquely truncated. The curved and pointed termination has a small distal lip. The opening is terminal. p. 45
Macrostomum ruebushi var carolinensis Fig 9-10.jpg
The penis-stilette is unique in that the proximal basal portion is not only dentated but is truncated at an oblique angle. This penis funnel is terminally curved and sharply pointed. The opening is terminal on this stilette. p. 27
Macrostomum ruebushi var granulophorum Fig 19-23.jpg
This stilette is lined by bands of muscles which presumably aid in ejaculation. The stilette has a bend of almost a right angle at its sharpened termination and opening. p. 36
Macrostomum ruebushi var recurvostylum Fig 24-26.jpg
The eyes are small, black, and are not embedded in the brain tissue. The penis-stilette is an irregularly reduced funnel with a pointed end hooked into a right hand bend. The opening is terminal and is toward the posterior. The base is wide and crenated. p. 39
Macrostomum ruebushi var crenatostylum Fig 11.jpg
The long oval opening occupies the entire end of the bent portion of the stilette. The base is crenated. The hooked end of the stilette points ventrally toward the male opening. p. 29
Macrostomum ruebushi var frigoriphilum Fig 14-18.jpg
The fairly large reniform eyes are oriented in a latero-anterior fashion. The penis-stilette is a slightly curved funnel with a distally sharpened point. The opening is terminal. p. 33
Macrostomum ruebushi Fig 8.jpg
The penis-stilette is a greatly curved funnel which extends from a very broad, deeply indented base and suffers two changes of direction-one a half circle and the other a right angle bend at which point by a gradual reduction the genital canal terminates in a very sharp point. The external opening is terminal and oval in shape and is formed by an angular truncation of that part of the stilette. The sperm-cells possess a tactile feeler, an undulating midbody provided with two short setae, and a highly vibratile tail region. The setae appear early. A longitudinal row of chromatin granules extends from the origin of the lateroposterior pair of setae. p. 24