Stylonychia ammermanni* sp. n., a New Oxytrichid (Ciliophora ...

78 R. Gupta et al.
Table 1. Morphometric characterization of Stylonychia ammermanni sp. n. (Data from protargol impregnated cells. All measurements are
in µm)
Character Mean Minimum Maximum SD CV n
Body length 133.98 125.65 146.48 5.00 3.73 25
Body width 52.12 47.25 57.75 3.01 5.78 25
Body length/Body width 2.58 2.33 2.97 0.15 5.94 25
Macronuclear, number 2.00 2.00 2.00 0.00 0.00 25
Macronuclear, length 25.27 24.33 26.08 0.61 2.41 12
Macronuclear, width 10.33 9.98 10.68 0.53 5.72 12
Micronuclear, number 2.00 2 4 - - 25
Micronuclear diameter 2.62 2.45 2.97 0.20 7.91 12
Adoral membranelles, number 51.43 46 55 2.24 4.35 30
Adoral length 70.80 65.10 80.50 3.95 5.58 25
Adoral length/Body length 0.53 0.48 0.61 0.03 5.05 25
Frontal cirri, number 8.00 8 8 0.00 0.00 25
Ventral cirri, number 5.00 5 5 0.00 0.00 25
Transverse cirri, number 5.00 5 5 0.00 0.00 25
Left marginal cirri, number 17.17 13 18 1.12 6.51 30
Right marginal cirri, number 24.20 22 27 1.45 5.98 30
Dorsal kineties (DK), number 4.00 4 4 0.00 0.00 25
Dorsomarginal (DM), number 2.00 2 2 0.00 0.00 25
Dorsal bristles, number in DK 1
52.67 44 58 4.19 7.95 12
DK 2
40.58 36 45 3.20 7.89 12
DK 3
28.83 24 33 2.66 9.22 12
DK 4
20.83 19 25 1.99 9.56 12
DM 1
29.33 26 32 2.10 7.17 12
DM 2
17.00 15 20 1.86 10.93 12
Dorsal bristles, total number 189.25 176 200 8.01 4.23 12
Caudal cirri, number 3.00 3 3 0.00 0.00 25
Abbreviations: CV - coefficient of variance, SD - standard deviation, n - number
Table 2. Morphometric comparison of S. ammermanni sp. n. with S. mytilus and S. lemnae. Measurements are in µm
Characters S. ammermanni sp. n. S. mytilus S. lemnae
(Present investigation) (German population, (German population,
Wirnsberger et al. 1986) Wirnsberger et al. 1986)
Appearance No bulge in the Bulge in the Bulge in the postperistomial
region peristomial region peristomial region
Body length 130 227 188
Body width 50 110 82
Macronuclear, size 25 x 10 37 x 11 27 x 11
Micronuclear, size 2.6 3.6 4
Adoral length ≥ 50% of body length ≥ 50% of body length ≤ 50% of body length
AM, number 50 71 63
Posterior frontal cirri (F 5-8
) Arranged in two pairs; Arranged in a ‘L’ Arranged in a ‘J’
posterior pair close shaped manner shaped manner
to cytostome
Left marginal cirri (LMC) Straight Anterior 2-3 cirri Anterior 2-3 cirri
curved inward
curved inward
LMC, number 17 27 25
RMC, number 24 38 37
Dorsal kineties Bent apically Curved apically Bent apically
Conjugation Occasional Frequent Frequent
Encystment Occasional Frequent Frequent
Abbreviations: AM - adoral membranelles, RMC - right marginal cirri