sperm bristles absent

The penis-stilette in this Macrostomum is almost straight and is terminally curved in weakly pressed specimens. There are two flanges in the curved termination, the one on the convexity of the curve being longer than the one on the concavity of the curve. Thus, it appears, that this stilette, in which four lateroterminal borders may be seen, is cut in bias. p. 193/194

Taxonomic name:

Macrostomum gilberti (Macrostomorpha)

Macrostomum collistylum Fig 1-3.jpg

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Keywords:

habitus total (Image keywords), eyes small (Image keywords), stylet base conical (Image keywords), stylet shaft with one turn (Image keywords), stylet tip opening oblique (Image keywords), stylet tip thickening absent (Image keywords), stylet shaft decoration lined (Image keywords), sperm bristles absent (Image keywords), sperm shaft indistinct (Image keywords), sperm feeler distinct (Image keywords)

Description:

The stylet reaches its termination in a long sharpened point. p. 188 The sperm cells are elongate, undulating bodies which lack the postero-Iateral setae so common to the genus and are possessed of chromatin granules in the anterior part of the cell having the largest caliber. p. 189

Taxonomic name:

Macrostomum collistylum (Macrostomorpha)

Macrostomum obtusum Fig 7-10.jpg

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Keywords:

stylet tip opening subterminal (Image keywords), stylet shaft decoration absent (Image keywords), stylet shaft with more than one turn (Image keywords), stylet base tubular (Image keywords), stylet tip thickening unilateral pointed (Image keywords), sperm bristles absent (Image keywords), sperm shaft indistinct (Image keywords), sperm feeler distinct (Image keywords)

Description:

An oval terminal external opening is provided. p. 278

Taxonomic name:

Macrostomum obtusum (Macrostomorpha)

Macrostomum ruebushi var crenatostylum Fig 11.jpg

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Keywords:

habitus total (Image keywords), eyes small (Image keywords), stylet shaft with one turn (Image keywords), stylet tip opening oblique (Image keywords), stylet base tubular (Image keywords), stylet shaft decoration lined (Image keywords), stylet tip thickening unilateral pointed (Image keywords), sperm bristles absent (Image keywords), sperm feeler distinct (Image keywords)

Description:

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

Taxonomic name:

Macrostomum ruebushi crenatostylum (Macrostomorpha)

Macrostomum ruebushi Fig 8.jpg

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Description:

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

Taxonomic name:

Macrostomum ruebushi (Macrostomorpha)

Macrostomum virginianum Fig 1.jpg

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Imaging technique:

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Keywords:

sperm feeler indistinct (Image keywords), sperm bristles absent (Image keywords), sperm shaft indistinct (Image keywords), sperm brush absent (Image keywords), sperm feeler distinct (Image keywords), sperm bristles present (Image keywords), sperm shaft distinct (Image keywords)

Taxonomic name:

Macrostomum virginianum (Macrostomorpha)

Macrostomorpha

taxonomy and phylogeny