Platina marina, Jiang & Wang & Liao & Al-Farraj & Warren & Hu, 2024
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publication ID |
https://doi.org/ 10.1093/zoolinnean/zlad116 |
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publication LSID |
lsid:zoobank.org:pub:8E04CA83-16B0-4A9F-80B0-267704C75165C |
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DOI |
https://doi.org/10.5281/zenodo.11248009 |
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persistent identifier |
https://treatment.plazi.org/id/03DD8799-8868-A16B-AFE2-F952FBC7F858 |
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treatment provided by |
Plazi |
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scientific name |
Platina marina |
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gen. nov., sp. nov. |
Platina marina gen. nov., sp. nov.
( Figs 2 View Figure 2 , 3 View Figure 3 ; Table 1 View Table 1 )
Zoobank registration: urn:lsid:zoobank.org:act:3EAF307E-73C6-4AF9-BD92-67ADE3BB3193
Diagnosis: Body size ~40–85 μm × ~15–25 μm in vivo; dorsoventrally flattened ~2:1; single globular to ellipsoidal macronucleus and single ellipsoidal micronucleus; circumoral kinety with a ventral gap, composed of 10–12 dikinetids; ~45 longitudinal perioral kineties forming six rings, i.e. four anterior rings arranged as two pairs and two well-separated posterior rings; 9–11 longitudinal somatic kineties forming 15–21 transverse rows that are confined to the ventral side except for the second transverse row, which surrounds the body.
Type locality: Intertidal zone of the Yellow Sea coast near Zhanqiao Pier, Qingdao (36°04ʹ03″N, 120°19ʹ35″E), Shandong Province, China. The salinity was 31‰ and the water temperature 10°C GoogleMaps .
Type specimens: A protargol slide containing the holotype specimen (registration number:JLM2021113001-1; Fig.2B, C View Figure 2 ) was deposited in the Laboratory of Protozoology , Ocean University of China. A second protargol slide (registration number: JLM2021113001-2) containing paratype specimens was deposited in the Marine Biological Museum , Chinese Academy of Sciences, Qingdao .
Etymology: The species-group name marina (Latin adjective; living in the sea) alludes to the marine habitat where the species was found.
Description: Cell size in vivo ~40–85 μm × ~15–25 μm, on average 50 μm × 15 μm, with a length-to-width ratio of 2–4:1 ( Figs 2A View Figure 2 , 3A View Figure 3 ). Main part of body flattened dorsoventrally ~2:1 and progressively more flattened from anterior end to posterior end ( Figs 2A, F View Figure 2 , 3A–I View Figure 3 ); transverse bulge located in anterior quarter of body on dorsal side where one row of somatic cilia is located ( Figs 2F View Figure 2 , 3H, I View Figure 3 ). Anterior end of body, with conspicuous apical plate; posterior half of body distinctly narrowed, with a broadly pointed caudal end ( Figs 2A View Figure 2 , 3A View Figure 3 ). Individuals vary widely in shape, usually spindle shaped, with posterior region curved back towards ventral side ( Fig. 3A, I View Figure 3 ). Outline not symmetrical, some individuals with a head that is turned to one side; body flexible but not contractile; body surface uneven ( Figs 2A View Figure 2 , 3A–I View Figure 3 ). Oral basket and nematodesmata absent; cytostome apically located but not conspicuous; perioral cilia densely arranged ( Figs 2A View Figure 2 , 3K View Figure 3 ). Silverline system easily recognized in vivo; ventral argyrome consisting of regular rectangles, one between adjacent kineties; dorsal argyrome consisting of polygons of different sizes; perioral argyrome formed by slender rectangles that encircle head ( Figs 2G, H View Figure 2 , 3J–L View Figure 3 ). Ectoplasm forms conspicuous transparent alveolar layer with protrusions all around the cell; three shapes of alveolar layer correspond to pattern of silverline system, i.e. regular rectangles, polygons and slender rectangles on ventral side, dorsal side and around oral area, respectively ( Figs 2A View Figure 2 , 3A–L View Figure 3 ). Cytoplasm colourless but partly opaque at low magnifications owing to presence of refractive inclusions and small granules ( Fig. 3C, E View Figure 3 ). Single macronucleus, globular to ellipsoidal, ~7–10 μm × ~5–8 μm after protargol staining, centrally located, with numerous spherical nucleoli ~1 μm wide ( Figs 2C View Figure 2 , 3M, N View Figure 3 ). Single ellipsoidal micronucleus, adjacent to macronucleus, ~2 μm × ~3 μm ( Fig. 3N View Figure 3 ). No contractile vacuole or cortical granules observed. Locomotion by swimming moderately fast in upper layer of water with an irregular trajectory.
Most somatic cilia ~9–10 μm long; perioral cilia slightly longer, ~10–11 μm long; single caudal cilium, ~25 μm long ( Figs 2A View Figure 2 , 3B View Figure 3 ). Perioral kineties consisting of 43–48 longitudinal rows of kinetids, forming six rings that encircle the anterior region of the body, considerably more densely ciliated than other somatic kineties; four anterior rings arranged as two pairs, two posterior rings well separated ( Figs 2B–E, I View Figure 2 , 3O–R View Figure 3 ). Other somatic kineties monokinetid, composed of 9–11 longitudinal rows of monokinetids (here referred to as longitudinal kineties), kinetids of which form 15–21 transverse rows that are confined to ventral side, except second transverse row, which surrounds the body ( Figs 2B–E, I View Figure 2 , 3Q, R View Figure 3 ). Circumoral kinety consists of 10–12 pairs of kinetids, with a conspicuous gap on the ventral side, thus not forming a circle ( Figs 2B–E, I View Figure 2 , 3O, R View Figure 3 ).
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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