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

Table 4. Comparison of some closely-related Holosticha species with posteriorly-positioned contractile vacuoles, that have been re-defined following examination using modern
methods. Measurements in µm
Characters H. diademata H. diademata H. pullaster H. foissnseri H. spindeleri H. heterofoissneri
Cell size in vivo 80-90 x 25-50 50-70 x 20-26 60-90 x 20-30 130-170 x 40 100-115 x 45 110-150 x 30-60
Size after impregnation 51-65 x 38-48 36-59 x 14-28 - 93-174 x 29-55 86-208 x 25-84 90-133 x 30-56
Habitat marine marine freshwater marine marine marine
Cortical granules present, absent absent absent absent present,
sparsely
sparsely
distributed
distributed
Elongate posteriormost absent absent absent absent present absent
adoral membranelle
Position of contractile vacuole behind behind behind behind behind behind
mid-body mid-body mid-body mid-body mid-body mid-body
Number of membranelles 24-30 10-21 20-28 26-36 22-43 41-49
Number and distribution 2 2 2 5-11, in a lineal 1-4 14-21, in a circular
of macronuclear nodules pattern pattern
Number of dorsal kineties 4 4-5 4 4 4-5 5
Number of cirral pairs ca 8 10-11 9-15 16-20 9-17 12-15
in midventral rows
Number of transverse cirri 6-10 6-8 7-12 9-17 7-14 12-17
Number of cirri in left 8-12 9-12 10-15 20-26 19-26 19-25
marginal row
Number of cirri in right 10-14 9-11 ca 15 21-27 11-26 27-33
marginal row
Geographic region Yellow Sea, China Antarctica Europe Antarctica Antarctica Yellow Sea, China
References Hu and Song (1999) Petz et al. (1995) Foissner et al. (1991) Petz et al. (1995) Petz et al. (1995) present paper
On four marine hypotrichs 155