Plagiopyla rariseta, Li & Zhuang & Feng & Al-Farraj & Schrecengost & Roưerova & Beinart & Hu, 2023
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publication ID |
https://doi.org/ 10.1093/zoolinnean/zlad015 |
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publication LSID |
lsid:zoobank.org:pub:854433BD-5D76-44C1-9BAB-CAC00F5131C9 |
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DOI |
https://doi.org/10.5281/zenodo.8426119 |
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persistent identifier |
https://treatment.plazi.org/id/0397E660-DC5E-831D-FEB4-40FDF7ADFA2C |
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treatment provided by |
Plazi |
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scientific name |
Plagiopyla rariseta |
| status |
sp. nov. |
Plagiopyla rariseta sp.nov.
( Figs 4 View Figure 4 , 5 View Figure 5 ; Table 3)
ZooBank registration: urn:lsid:zoobank.org:act:DD5C54CE-052D-4C2B-BA78-89C3B604B104 .
Diagnosis: Cell size 55–80 × 25–45 μm in vivo, shape ellipsoidal. Length to width ratio 1.4–2.2: 1 in vivo. 50–58 monokinetidal somatic kineties. Cilia above the oral opening loosely arranged. One globular to slightly ellipsoidal macronucleus and one small, spherical micronucleus. Striated band about 32 μm long, extending to below midbody. One dense ciliary row. Numerous curved extrusomes, 8–11 µm long. Region above oral opening about 30% of cell length. Tube-shaped buccal cavity obliquely extended to the leħ dorsal side, about 80% of cell width, bending upwards in the middle.
Etymology: Composite of the Latin words rara (few, sparse) and saeta (bristle ~ cilia), referring to sparse cilia above the oral opening.
Type locality: Sediments of intertidal zone in Bainidi Park, ºingdao, China (36°12ʹ03.1″N; 120°22ʹ27.3″E) GoogleMaps .
Type deposition: The protargol slide (registration number: LR2020071701-01) with the holotype specimen ( Figs 4H, I View Figure 4 , 5F, G View Figure 5 ) and several paratype specimens, and another slide (registration number: LR2020071701-02) with several paratype specimens were deposited in the Laboratory of Protozoology , Ocean University of China, ºingdao, China. The holotype was marked by a black ink circle on the back side of the slide .
Description of Chinese population: Body non-contractile, 55–80 × 25–45 μm in vivo, with length to width ratio 1.4–2.2:1. Shape ellipsoidal in both living and stained cells, dorsoventrally flaưened ( Figs 4A View Figure 4 , 5A, B View Figure 5 ). Cortex ridged with kinetosomes located at top of ridges ( Fig. 5K View Figure 5 ). Cytoplasm colourless, including numerous small globular granules and a few food vacuoles with green algae inside ( Figs 4A View Figure 4 , 5A, B, L View Figure 5 ). One globular to slightly ellipsoidal macronucleus, 18–23 × 18–20 µm in vivo and 13–22 × 12–21 µm aħer staining, mostly located at midbody ( Figs 4A, E View Figure 4 , 5E View Figure 5 ). Single globular micronucleus, relatively small, 1.1–1.7 µm across in stained specimens, always slightly enveloped by macronucleus, hardly observed in vivo ( Fig. 5E View Figure 5 ). Numerous curved extrusomes 8–11 µm long, distributed randomly in endoplasm and relatively densely under the cortex ( Figs 4A, B View Figure 4 , 5L View Figure 5 ). Extruded extrusomes slender, needle-shaped, 20–37 µm long ( Figs 4C View Figure 4 , 5C View Figure 5 ). Single subterminal contractile vacuole, opens dorsally with two distinct pores ( Figs 4A, D View Figure 4 , 5A, B, K, N View Figure 5 ). Striated band on dorsal surface, 29–35 µm long, 3–4 µm wide, extending below midlength. In normal cells, striated band usually rodshaped viewed from dorsal side, parallel to ciliary rows, loop at the front part easily observed in compressed cells ( Figs 4D, I View Figure 4 , 5O View Figure 5 ). Swims by spiralling counter-clockwise around body axis. Sluggish or even motionless aħer a period of exposure to air.
Somatic cilia 10–15 µm long, uniformly packed in 50–58 monokinetidal longitudinal kineties (25–31 on ventral, 25–30 on dorsal), except for about two dikinetid-like structures right to frontal region of striated band ( Figs 4G, H, I View Figure 4 , 5F, G View Figure 5 ). Cilia above the oral opening arranged loosely ( Figs 4H View Figure 4 , 5F View Figure 5 ). Seven to nine caudal cilia positioned at leħ rear margin, rigid, around 10 µm long, oriented to lower leħ ( Figs 4A View Figure 4 , 5M View Figure 5 ). One dense ciliary row (DC), 8–11 µm long, comprised of 10–16 kinetosomes, located leħ to cytoproct on dorsal side ( Figs 4D, I View Figure 4 , 5G View Figure 5 ).
Oral opening slit-shaped, opened at right ventral surface, surrounded by two lip-like structures ( Figs 4A, H View Figure 4 , 5A, B, F, H, J View Figure 5 ). No obvious nose-like structure on right side of upper oral lip. Region above oral opening about 30% of cell length. Buccal cavity long and thick, obliquely extended to leħ dorsal side, forming a deep tube, about 80% of cell width, making an upwards bend in middle ( Figs 4F View Figure 4 , 5D, H, I View Figure 5 ). Distance from anterior end of cell to top of buccal cavity 10–12 μm. Oral ciliature much denser than somatic one and discontinuous, leaving gaps around upper and lower lips, with upper gap 2–4 μm wide ( Figs 4H View Figure 4 , 5F View Figure 5 ). Oral kineties (51– 56) extended from exterior of oral cavity to interior ( Figs 4F, H View Figure 4 , 5D, F View Figure 5 ). Upper oral lip kineties 5–8 μm long ( Figs 4F, H View Figure 4 , 5D, F View Figure 5 ).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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