Euplotes petzi, Wilbert & Song, 2008
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publication ID |
https://doi.org/ 10.1080/00222930701877540 |
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persistent identifier |
https://treatment.plazi.org/id/03B587B3-FF96-C456-FDEA-6383FC48FEF7 |
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treatment provided by |
Felipe |
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scientific name |
Euplotes petzi |
| status |
sp. nov. |
Euplotes petzi View in CoL nov. spec.
( Figures 6A–G View Figure 6 , 13E–H View Figure 13 ; Tables 4 and 5)
Diagnosis
Small marine Euplotes with conspicuous dorsal ridges, 50–80×30–50 Mm in vivo; buccal area about 2/3 of cell length with about 30 membranelles; always 10 frontoventral, five transversal, two caudal and two closely spaced, extremely fine marginal cirri; six dorsal kineties with about eight dikinetids in mid-dorsal rows. Macronucleus curved bar- or C-shaped. Found in Antarctic area.
Type locality
In benthos samples from rockpools and the littoral zone on the sea coast near Bellinghausen Station, King George Island (62 ° 139S, 58 ° 589W).
Dedication
We dedicate this species to our colleague, Dr. Wolfgang Petz, Zoologisches Institut der Universität Salzburg, Austria, in recognition of his great contributions to the studies on ciliates in Antarctica as well as his excellent descriptions of this organism as senior author ( Petz et al. 1995).
Description
Body shape generally elongate oval as shown in Figure 6A View Figure 6 . In vivo usually 60–70 Mm long; about five dorsal ridges conspicuous ( Figure 6C View Figure 6 , arrows). Buccal field prominent, adoral zone evenly curved. Most other features of living morphology, including movement, similar to the 1995 population (see Petz et al. 1995). Macronucleus variable in shape: from slightly curved (mostly) to typical C-shaped ( Figures 6B, F, G View Figure 6 ). Ciliary pattern rather consistent ( Figure 6E View Figure 6 ), always 10 frontoventral (FVC) and five strong transversal cirri (TC). Left marginal cirri (MC, Figure 6E View Figure 6 ) uniquely positioned: invariably two in number, fine and close together (could be regarded as a single following overstained silver-nitrate impregnation) with cilia about only 10 Mm long. Dorsal rows along ridges, conspicuously loosely ciliated ( Figures 6F, G View Figure 6 , 13F View Figure 13 ).
Silverline system not revealed in current isolation, though the 1995 population was reported as ‘‘double- patella type’’ ( Petz et al. 1995), i.e. similar to that of E. rariseta . But a re-check and re-investigation of this critical character are necessary.
Remarks
This new species was/is found, to date, only in the Antarctic area ( Agatha et al. 1993; Petz et al. 1995; present work) and hence is possibly a real Antarctic ‘‘local form’’. It differs from the morphologically closely- related congener, E. rariseta , in having 2 close-set marginal cirri (versus 1), larger size, stronger cirri and more membranelles ( Table 4). It can be separated from E. balteatus regarding the appearance of adoral zone (evenly curved versus sharply bending at posterior portion), conspicuously lower number of dorsolateral kineties (see Table 4), as well as the structure/arrangement of the marginal cirri (fine and closely spaced versus strong and far away from each other). In addition, the latter form is mostly broadly oval (versus slender oval) and smaller (mostly about 50 Mm versus mostly 60–70 Mm).
Agatha et al. (1993) reported an Euplotes sp. from the same area according to the information they have given; it could be conspecific with our new species though some statistical data are slightly different.
Comparison with other small, equally Antarctic-inhabiting forms is documented in Table 4; the new species described here can be clearly recognized by the combination of either the ciliature pattern/appearance of ciliary organelles or by other morphometrical and statistical data ( Agatha et al. 1990, 1993).
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