New Contribution to the Morphology and Taxonomy of Four Marine ...

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152 W. Song et al. Table 2. Morphometric data for two populations of Pseudokeronopsis flavicans. All data are based on protargol impregnated specimens. Measurements in µm Character Min Max Mean SD SE CV n Length of body 180 220 204.7 14.84 6.06 7.3 9 193 238 209.1 21.16 7.99 8.1 14 Width of body 40 48 44.0 2.83 1.15 6.4 9 56 65 60.1 4.67 1.77 6.2 14 Length of buccal field 60 67 64.7 4.50 1.84 7.0 9 55 72 65.1 7.35 2.78 9.0 14 Number of membranelles 46 54 51.3 2.73 1.12 5.3 9 50 66 56.1 5.49 2.08 9.8 7 Number of cirral pairs in bicorona* 5 7 - - - - 5 6 9 7.4 0.97 0.31 13.1 10 Number of buccal cirri 1 1 1 0 0 0 12 1 2 1.1 0.33 0.10 30.9 9 Number of frontoterminal cirri 2 2 2 0 0 0 9 2 2 2 0 0 0 11 Number of transverse cirri 3 5 4.1 0.52 0.15 12.6 10 3 6 3.6 0.97 0.32 26.8 9 Number of pairs of cirri in midventral rows 25 32 28.3 2.35 0.78 8.3 7 29 40 33.4 4.39 1.46 13.1 9 Number of cirri in left marginal row 40 51 - - - - 5 50 57 52.4 3.05 1.36 5.8 8 Number of cirri in right marginal row 44 57 - - - - 5 56 65 60.2 3.16 1.29 5.3 8 Number of macronuclei - - - - - - - 72 97 - - - - 2 Number of dorsal kineties 4 5 4.1 0.32 0.10 7.7 10 4 5 4.1 0.36 0.10 8.8 14 *Anteriormost frontal cirri which are positioned in two widely spaced rows forming the bicorona Qingdao population, we here provide a detailed description and a new diagnosis. Improved diagnosis. Marine Pseudokeronopsis, body slender, ribbon-shape with narrow caudal portion, 200-300 x 40-55 µm in vivo and yellow in colour. Ciliature comprising bicorona of 5-9 pairs of frontal cirri; one buccal, 2 frontoterminal and 3-6 transverse cirri; two midventral rows consisting of about 25-40 pairs of cirri which terminate caudally about 15 µm above the inconspicuous transverse cirri; 46-66 adoral membranelles; 40-57 (mean 52) left and 44-65 (mean 60) right marginal cirri; 4-5 dorsal kineties. Numerous macronuclear segments. One contractile vacuole anterior 2/5 of body. Bright yellow-brownish cortical granules grouped around cilia and cirri; colourless blood-cell-shaped granules lying just beneath pellicle and distributed throughout whole cell. Morphological description. Cells flexible, slightly contractile and often somewhat distorted in middle portion, i.e. folded or twisted, when crawling or gliding on bottom of Petri dish (Fig. 17); body dorsoventrally flattened about 1:2. Body shape distinctly slender with posterior portion often distinctly narrowed; ratio of cell length to width about 5-6:1 (Figs 9, 16, 17); buccal field narrow and inconspicuous, about 1/4 - 1/5 of body length. Cell margins generally parallel but sometimes swollen in middle portion (Figs 9, 16). Dorsal side slightly uneven and irregularly bulged (Fig. 17). Pellicle soft and thin. “Cortical granules” consisting of two types: type 1, which are spindle-shape, about 1- 1.5 µm long, bright yellow-brownish and regularly grouped in dense rosette-pattern around both cirri (ventrally) and cilia (dorsally). These granules are thus distributed in belts or lines along cirral rows and dorsal kineties, rendering whole cell bright yellow (Figs 11, 12, 16). This species, however, also appears to contain some “dissolved pigments” because, in addition to these belts of pigment-like granules, other regions are also yellowish
On four marine hypotrichs 153 Figs 38-45. Photomicrographs of Pseudokeronopsis flavicans from life (44, 45) and after protargol impregnation (38-41). 38 - ventral view of anterior portion, double-arrowheads mark the paroral membrane; 39 - infraciliature of ventral side; 40 - dorsal view, to show the cilia of dorsal kineties; 41 - ventral side of posterior end, to show the transverse cirri (arrowhead); 42 - ventral view of posterior portion; note that the midventral rows extend to subcaudal region (arrow); 43 - to show the buccal apparatus; 44 - ventral view, to show the pigments (double-arrowhead) and “cortical granules” (arrowheads); 45 - a slightly contracted individual
Page 1 and 2: Acta Protozool. (2002) 41: 145 - 16
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