Papyridea semisulcata (Gray, 1825)
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publication ID |
https://doi.org/ 10.1111/j.1096-3642.2008.00385.x |
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DOI |
https://doi.org/10.5281/zenodo.10546333 |
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persistent identifier |
https://treatment.plazi.org/id/131887E2-6333-1E2F-18F4-4D7DF8B3FBAD |
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treatment provided by |
Felipe |
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scientific name |
Papyridea semisulcata |
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PAPYRIDEA SEMISULCATA View in CoL ( FIG. 5 View Figure 5 )
Acrosomal complex
The acrosomal vesicle is dome-shaped, with a flat or slightly domed apex, and measures approximately 0.55 ± 0.05 Mm (N = 5) in length and 0.7 ± 0.05 Mm (N = 5) in maximum diameter ( Fig. 5A–D View Figure 5 ). Contents of the vesicle are differentiated into an extensive, very electron-dense basal ring, and a less dense (and granular) anterior component ( Fig. 5B, D View Figure 5 ). A broad basal invagination extends for approximately half the length of the acrosomal vesicle and is filled with granular subacrosomal material ( Fig. 5A–C View Figure 5 ). Discernible within the basal ring are two curved, very electron-dense layers and an innermost, electronlucent layer ( Fig. 5B, D View Figure 5 ).
Nucleus
The nucleus is short (length 1.45 ± 0.05 Mm, N = 3) and barrel shaped, with a maximum diameter of ·
1.45 ± 0.05 Mm (N = 3) (at mid-length) ( Fig. 5A View Figure 5 ). Nuclear contents are highly electron-dense, granulate, with numerous irregular lacunae ( Fig. 5A, E View Figure 5 ). Apically the nuclear surface is straight or slightly concave, while posteriorly shallow indentations contact the anterior surfaces of each midpiece mitochondrion ( Fig. 5A View Figure 5 ).
Midpiece
The midpiece consists of four spherical mitochondria (with well-developed cristae) surrounding a pair of centrioles ( Fig. 5A, F View Figure 5 ). The entire midpiece region has a length of 0.7 ± 0.04 Mm (N = 3) and a maximum diameter (of mitochondrial cluster) of 1.7 ± 0.1 Mm (N = 3).
Flagellum
The flagellum consists of a 9 + 2 microtubular configuration axoneme sheathed by the plasma membrane. From light microscopic observations, flagellar length is 54 ± 2.0 Mm (N = 10).
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