sperm shaft indistinct

Dunwichia arenosa Fig 4.jpg

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Keywords:

habitus total (Image keywords), section (Image keywords), eyes absent (Image keywords), sperm feeler indistinct (Image keywords), sperm bristles absent (Image keywords), sperm shaft indistinct (Image keywords), sperm brush absent (Image keywords)

Description:

eyes absent. p. 995

Taxonomic name:

Dunwichia arenosa (Macrostomorpha)

Macrostomum glochistylum Fig 13-19.jpg

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Keywords:

habitus total (Image keywords), eyes small (Image keywords), stylet base conical (Image keywords), stylet tip thickening unclear (Image keywords), stylet shaft straight (Image keywords), stylet tip opening unclear (Image keywords), stylet shaft decoration lined (Image keywords), sperm shaft indistinct (Image keywords), sperm feeler distinct (Image keywords), sperm bristles present (Image keywords)

Description:

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

Taxonomic name:

Macrostomum glochistylum (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)