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) .