Vannella bursella (Page, 1974) Smirnov et al., 2007

Lee, Won Je, 2016, New Korean records of two amoeboid protozoa (Protist); Vannella bursella and Pseudoparamoeba sp., Journal of Species Research 5 (3), pp. 381-384 : 382-383

Vannella bursella (Page, 1974) Smirnov et al., 2007

( Fig. 1 )

Material examined. Korea: Kyungsangnam­do , Masan Bay (35°23′N, 128°68′E), 29 Aug. 2012, from marine water column, collected by Won Je Lee. Type strain, live cells are kept with the Culture Collection of Protists, Kyungnam University , Korea, reference “ KM054 ” .

Description. Locomotive form flattened ovoid, semi-cir­ cular. Frontal hyaloplasm occupies about half the body length; posterior end widely rounded, straight or (rarely) concave. Greatest dimension of locomotive form 17­29 μm (avg. 23 μm). Single vesicular nucleus with central nucleolus. Floating form a rounded mass, without pseudopodia or with few blunt hyaline pseudopodia, rarely exceeding in length the diameter of the central mass. Cell surface includes glycostyles. Cysts not seen.

Remarks. This species resembles Vannella arabica Page, 1980 in cell length, but its locomotive forms are rather different from those of V. arabica . Vannella bursella has clearly semicircular locomotive forms while V. arabica has generally fan­shaped forms. In the culture of V. bursella , most cells were semicircular forms, but few cells were fan­shaped forms. In addition, according to Smirnov et al. (2007), the species group of V. arabica , V. bursella and V. calycinucleolus has 100% support by three methods (NJ, PHYML and Bayesian trees), and only 5 bases differ between V. arabica and V. bursella ; one at the beginning of the sequence, the rest in the most variable parts of the molecule. Further studies are need­ ed to clarify these two species.

Habitat. Marine water.

World distribution. England, Korea.

Deposition. NIBRPR0000106579, NIBRPR0000106580.

Order Dactylopodida Smirnov et al., 2005

Family Paramoebidae (Poche, 1913) Kudryavtsev et al., 2011

Genus Pseudoparamoeba Page, 1979

Figures

Fig. 1. Vannella bursella, isolate KM054, Locomotive forms of seven different cells. (a)­(c) Cell 1, (c) note pseudopodia drawn from posterior end of cell. (d) Cell 2. (e) Cell 3. (f)­(h) Cell 4. (i) Cells 5 & 6. (j)­(l) Cell 7. Nucleus (N), food vacuole (FV). All micrographs are DIC (differential interference contrast) images with the exceptions of (d) and (h) (phase contrast images). Scale bar in (l)=10μm for all images.