Orthodonella gutta ( Cohn, 1866 ) Kahl, 1931
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publication ID |
https://doi.org/ 10.1080/00222930320001409912 |
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persistent identifier |
https://treatment.plazi.org/id/261F2A53-FF91-FF95-CC8B-FC34FD92FEE5 |
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treatment provided by |
Felipe |
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scientific name |
Orthodonella gutta ( Cohn, 1866 ) Kahl, 1931 |
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Orthodonella gutta ( Cohn, 1866) Kahl, 1931 View in CoL
( figures 3, 5–7, 10, 11 View FIGS , 29–36 View FIGS ; table 1)
To the authors’ knowledge, no investigations based on modern methods have been carried out since this species was reported. Thus, a detailed redescription of both living morphology and infraciliature is supplied here.
Improved diagnosis
Marine Orthodonella in vivo about 140–200 6 60–100 M m; body widely ellipsoidal with contractile beak-like anterior end; 62–74 (mean 66) somatic kineties with ca 41–48 ventral and 20–26 dorsal; synhymenium consisting of 43–70 dikinetids; 11–14 pharyngeal rods; one to several contractile vacuoles distributed in caudal area of cell; numerous cortical granules tiny and colourless; one ovoid macronucleus.
Sample sites
This population was collected from an open scallop-farming pond ( Chlamys farreri ) (salinity about 29, pH 7.3, water temperature about 8 ‡ C) off Qingdao.
Neotype specimens
Since no type specimens, treated with silver impregnation, have been deposited, one neotype, a protargol-impregnated slide, is deposited in the Natural History Museum , London, UK (registration number 2003:3:27:2) and one neoparatype, No.
All measurements are in M m.
(?), accounted from drawings, data not given.
Gong-00-12-22, protargol-impregnated specimen, has been deposited in the Laboratory of Protozoology, Ocean University of China.
Description of the Qingdao population
Cells in vivo generally larger than Orthodonella apohamatus , about 140–200 6 60–100 M m in size (N ~3). Body ellipsoidal with considerably tapering anterior end ( figures 7 View FIGS , 31, 32 View FIGS ). Unlike the new species described above, its pellicle is relatively flexible and the body is highly changeable with conspicuous contraction, especially the pointed anterior portion: from strongly bending to left (keeping this beak-like shape when still) to stretching straight forward ( figure 3 View FIGS ). Cilia about 3–6 M m in length. Cortical granules tiny (ca 0.5 M m across), colourless and densely arranged between kineties ( figures 5 View FIGS , 34 View FIGS ). Cytostome (Cyst) rounded, in anterior fifth to sixth near right margin ( figures 7, 10 View FIGS ; figures 35, 36 View FIGS , arrows). Nematodesmata about 20–40 M m in length, consisting of 11–14 pharyngeal rods. Cytoplasm colourless, often containing numerous greasy globules (1–2 M m across) ( figures 6, 7 View FIGS , 31–33 View FIGS ). Food vacuoles usually with diatoms ( figures 7 View FIGS , 31, 32 View FIGS ). Four contractile vacuoles (3–8 M m across) (N ~3) distributed at posterior part of cell ( figures 7, 10 View FIGS ). Macronucleus ovoid, 28–40 6 10–28 M m in size after impregnations ( figures 7, 11 View FIGS , 29, 30 View FIGS ).
Movement as in O. apohamatus , slow, with the anterior part swinging as it looks for food.
Infraciliature as shown in figures 10, 11 View FIGS , 29–30 View FIGS . Synhymenium composed of 43–70 (mean 53) dikinetids ( figures 10 View FIGS , arrow). In total 62–74 (mean 66) somatic kineties including about 20–26 (mean 23) on dorsal and 41–48 (mean 44) on ventral side; conspicuously more densely arranged on ventral side than dorsal. Preorally about seven kineties curving around cytostome and separated by it ( figure 10 View FIGS , arrowheads); postorally meridional.
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.