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148 W. Song et al. Table 1. Morphometrical data of Bakuella agamalievi Borror & Wicklow, 1983 (upper line) and Holosticha heterofoissneri (lower line). All data are based on protargol impregnated specimens. Measurements in µm. Abbreviation: CV - coefficient of variation in %; Max - maximum, Min - minimum, n - number of cells measured; SD - standard deviation; SE - standard error of mean Character Min Max Mean SD SE CV n Length of body 97 131 115.7 11.38 3.79 9.8 19 90 133 116.5 18.02 6.37 15.5 8 Width of body 48 70 58.8 7.12 2.25 12.1 19 30 56 44.9 10.65 4.03 23.8 7 Length of buccal field 37 52 43.8 5.62 1.69 12.8 19 44 52 48.7 2.69 1.02 5.5 7 Number of membranelles 26 37 30.9 4.14 1.57 13.4 7 41 49 44.6 3.25 1.08 7.3 9 Number of frontal cirri* 4 4 4 0 0 0 14 4 4 4 0 0 0 12 Number of buccal cirri 1 1 1 0 0 0 14 1 1 1 0 0 0 12 Number of frontoterminal cirri 4 7 5.6 0.88 0.29 15.9 9 2 2 2 0 0 0 12 Number of transverse cirri 4 7 5.2 1.14 0.36 21.8 10 12 17 14.3 1.49 0.50 10.4 8 Number of pairs of cirri in midventral rows 9 13 10.9 1.46 0.52 13.4 7 12 15 13.4 1.27 0.48 9.5 7 Number of ventral rows** 3 6 4.0 1.16 0.37 28.9 10 - - - - - - - Number of cirri in left marginal row 30 38 32.9 3.67 1.39 11.2 7 19 25 21.8 2.25 0.80 10.4 10 Number of cirri in right marginal row 40 47 43.4 3.21 1.43 7.4 7 27 33 30.4 2.01 0.67 6.6 10 Number of macronuclei 47 60 - - - - 4 14 21 17.3 1.96 0.57 11.4 12 Length of macronuclei 5 7 - - - - - 6 12 8.8 2.10 0.66 23.8 16 Width of macronuclei 3 5 - - - - - 4 10 7.0 2.31 0.73 32.9 16 Number of dorsal kineties 3 3 3 0 0 0 14 5 5 5 0 0 0 16 * Not including buccal cirrus ** Short rows behind the midventral rows arranged and terminate at about posterior 1/3 of cell length. Almost always 5 fine transverse cirri, terminally positioned with relatively short cilia (ca 15 µm long), which extend only slightly beyond posterior margin of cell when observed in vivo (Fig. 1). Marginal rows separated posteriorly. Dorsal cilia 2-3 µm long, consistently arranged in 3 dorsal kineties, which extend over entire length of cell; caudal cirri absent (Fig. 8). Comparison and discussion. This species was originally described by Agamaliev (1972) under the name Holosticha manca. We agree with Borror and Wicklow (1983) that it should belong to the genus Bakuella because it possesses several obliquely oriented ventral rows behind the midventral rows. The Qingdao population is considered conspecific with B. amagalievi because of its body shape and size, biotope, nuclear apparatus and the general pattern of its ciliature. Compared with other congeners, this species can be recognized by having fewer and shorter ventral rows, fewer buccal cirri, a significantly smaller body size and a different biotope (Agamaliev and Alepterov 1976; Alekperov 1982, 1992; Mihailowitsch and Wilbert 1990; Song et al. 1992). Morphologically, this species is also similar to Holosticha manca Kahl, 1932. According to the redescription by Song and Wilbert (1997), however, the latter is relatively smaller (42-106 vs. 97-131 µm after protargol impregnation), has fewer adoral membranelles
On four marine hypotrichs 149 Figs 9-20. Pseudokeronopsis flavicans (9-18), Pseudokeronopsis carnea (19) and Pseudokeronopsis flava (20) from life (9-12, 16-18) and after protargol impregnation (13-15, 19, 20). 9 - ventral view of a normal individual; note the contractile vacuole positioned about 2/5 of the way down the cell; 10 - to show the colourless “cortical granules”; 11, 12 - to denote the distribution of the pigments; 13 - ventral view, to show the details of the infraciliature in the anterior portion; arrow indicates the short paroral membrane, while the double-arrowheads mark the buccal cirrus; 14, 15 - ventral and dorsal views of the infraciliature; arrow in Fig. 14 marks the position where the midventral rows terminate; 16 - ventral view of a slender form; note that the yellow granules (pigments) are along the margins and the median of the cell; 17 - dorsal views, to show the appearance of some extended, bending or slightly contracted individuals; 18 - ventral view (redrawn after Kahl, 1932); 19, 20 - ventral view of infraciliature (after Wirnsberger et al. 1987); note that the midventral rows in Fig. 20 are significantly shortened and terminate well above the transverse cirri. AZM - adoral zone of membranelles, Cph - cytopharynx, CV - contractile vacuole, EM - endoral membrane, FC - frontal cirri, FTC - frontoterminal cirri, LMR - left marginal row, MVR - midventral rows, RMR - right marginal row, TC - transverse cirri. Scale bars: 9 -100 µm; 13-15, 19, 20 - 50 µm
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