Pseudovorticella marina (Greeff, 1870) Ji, Sun, Song & Warren, 2009

Ji, Daode, Shin, Mann Kyoon, Choi, Joong Ki, Clamp, John C., Al-Rasheid, Khaled A. S. & Song, Weibo, 2011, Redescriptions of five species of marine peritrichs, Zoothamnium plumula, Zoothamnium nii, Zoothamnium wang, Pseudovorticella bidulphiae, and Pseudovorticella marina (Protista, Ciliophora), Zootaxa 2930, pp. 47-59 : 57

Pseudovorticella marina (Greeff, 1870) Ji, Sun, Song & Warren, 2009

( Fig. 5 ; Table 1)

Pseudovorticella marina is characterized by the following characteristics: cell body measuring 40–50 × 35–45 µm (n=8) in vivo, macronucleus J-shaped, single contractile vacuole located near ventral wall of infundibulum, 25–30 transverse silverlines lying between peristome and trochal band, 10–15 silverlines lying between trochal band and scopula, P3 composed of three ciliary rows, rows 1 and 2 shorter than row 3 at adstomal ends (Song et al. 2009). Illustrations of its morphology ( Fig. 5 ) and brief comparison with similar species are also presented here.

The congener that most closely resembles P. marina is P. punctata (Dons, 1918) Warren, 1987 ( Fig. 5 E), which has similar body shape and size, but can be separated by its tuberculate pellicle (vs. smooth in P. marina ) and P3 consisting of two rows (vs. 3 rows in P. m a r i n a) ( Ji et al. 2006 a).

Living cells of,three species of Vorticella , V. campanulata ( Kahl, 1933) Šramek-Hušek, 1948 ( Fig. 5 F), V. f us ca Precht, 1935 ( Fig. 5 G) and V. j a e r a e Precht, 1935 ( Fig. 5 H), also bear some resemblance to P. marina at low magnification. Vorticella campanulata and P. m a r i n a have similar numbers of silverlines, but the former is a freshwater species (vs. marine in P. m a r i n a). Vorticella fusca has larger body than P. marina (80–110 × 65–75 µm vs. 40–50 × 35–45 µm), and zooids of V. j a e r a e do not have the elongate and twisted macronucleus and strongly everted peristomial lip characteristic of P. marina ( Warren 1986) .

Figures

FIGURE 5. Morphology of Pseudovorticella marina (A – D, I – Q) and similar species (E – H). A, J, M. General view of typical cells. B. Variations in shape of the cell body. C. From Warren, 1986. D. Oral infraciliature, arrow marks the epistomial membrane. E. Pseudovorticella punctata (from Ji et al. 2006 a). F. Vorticella campanulata (from Warren 1986). G. Vorticella fusca (from Warren 1986). H. Vorticella jaerae (from Precht 1935). I. Zooids seen at low magnification. K. Detail of stalk, arrows mark mitochondria. L. Detail of infundibular polykineties. N. Trochal band (arrows). O. Oral view of protargol impregnated specimen showing the epistomial membrane (arrow) and germinal kinety (arrowheads). P, Q. Silverline system, arrows mark pellicular pores. Abbreviations: G, germinal kinety; H, haplokinety; P 1 – 3, infundibular polykinety 1 – 3; Po, polykinety. Scale bars: 20 Μm (Figs. A – C, E – H), 60 Μm (Fig. J), 100 Μm (Fig. M), 150 Μm (Fig. I). Fig. 1