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

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