Orthodonella apohamatus, Lin & Gong & Song, 2004
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publication ID |
https://doi.org/ 10.1080/00222930320001409912 |
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persistent identifier |
https://treatment.plazi.org/id/261F2A53-FF9A-FF99-CC09-FAE3FC55F987 |
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treatment provided by |
Felipe |
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scientific name |
Orthodonella apohamatus |
| status |
sp. nov. |
Class KINETOFRAGMINOPHORA de Puytorac et al., 1974 View in CoL Order SYNHYMENIIDA de Puytorac et al., 1974 Family ORTHODONELLIDAE Jankowski, 1968 Genus Orthodonella Bhatia, 1936 Orthodonella apohamatus nov. spec. ( figures 1, 2, 4, 8, 9 View FIGS , 20–28 View FIGS ; table 1)
Diagnosis
Marine Orthodonella in vivo 60–160 6 20–35 M m; lanceolate body shape with conspicuous beak-like projection at anterior end; 42–60 (mean 53) somatic kineties, including 28–42 on ventral and 13–20 on dorsal side; synhymenium with about 54–62 dikinetids; pharyngeal basket composed of 8–13 rods; four contractile vacuoles, two in middle near left margin and two at posterior end of cell; one elongated macronucleus and one micronucleus.
Type location and ecological characters
This species was found once in large numbers in clean littoral water off Qingdao. Salinity was about 31, pH 8.0, water temperature 16 ‡ C.
Type specimens
One holotype, a slide of protargol-impregnated specimens, is deposited in the Natural History Museum , London, UK with registration number 2003:3:27:3; one
paratype (No. Lin-02-05-30) is deposited in the Laboratory of Protozoology, Ocean University of China.
Description
Cell size highly variable, 60–160 6 20–35 M m in vivo (N ~6). Body generally acontractile and constant in shape though it might be conspicuously different among individuals: from slender, spindle-shaped to broadly enlongated ( figure 4 View FIGS ); basically lanceolate in outline, anterior portion always strongly bending to left with beak-like projection, posterior end conspicuously narrowed to widely pointed ( figures 1, 4 View FIGS , 20–22, 25 View FIGS ). Dorsoventrally flattened about 3:1. Somatic cilia densely arranged, about 5–8 M m in length. Cytostome (Cyst) rounded ( figure 9 View FIGS ), in anterior
Data are based on protargol-impregnated specimens. All measurements are in M m. Mean, arithmetic mean; CV, coefficient of variation; N, sample size.
quarter near right margin ( figure 2 View FIGS , double-arrowheads; figures 20–22 View FIGS , arrows). Nematodesmata conspicuous, about 22 M m long, consisting of 8–13 pharyngeal rods and forming funnel-shaped basket ( figure 24 View FIGS , arrow). Cytoplasm colourless, often containing many greasy globules (3–4 M m across). Food vacuoles usually with diatoms, which often render the specimens rather brownish at low magnification ( figures 1 View FIGS , 20, 25 View FIGS ). Four contractile vacuoles (CV; 3–6 M m across; N ~6) distributed in two groups: two in middle near left margin, another two near posterior end of cell ( figures 1, 9 View FIGS ). Macronucleus (Ma) elongated, about 10–40 6 4–13 M m in size after impregnations ( figures 2, 4, 8 View FIGS ), containing densely packed globular nucleoli. Single micronucleus (Mi) oval in shape, about 8 M m long, close to macronucleus ( figures 2, 8 View FIGS , 23 View FIGS , arrow).
Movement slow, gliding on substratum without pause.
Infraciliature as shown in figures 8, 9 View FIGS , 26–28 View FIGS . Synhymenium positioned obliquely from right margin to apical end of beak, in which about 54–62 dikinetids are closely packed ( figures 2, 9 View FIGS , 26 View FIGS , arrows). In total 42–60 (mean 53) somatic kineties including about 36 (28–42) on ventral, which terminate anteriorly at the synhymenium: preorally about six rows curving around cytostome and separated by it ( figure 9 View FIGS , arrowheads); postorally meridional. On dorsal side, about 13–20 (mean 16) kineties, which are less densely distributed than those on ventral side ( figures 8, 9 View FIGS ).
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.