The neotypification of Frontonia vernalis (Ehrenberg, 1833) Ehrenberg, 1838 and the description of Frontonia paravernalis sp. nov. trigger a critical revision of frontoniid systematics

Table 4 Morphometric data on Frontonia paravernalis sp. nov.

Characters	\( \overline{\mathrm{X}} \)	SD	Min	Max	CV	n
Body, length^a	159.0	21.6	142.0	170.0	13.6	33
Body, length^a	171.7	10.1	152.0	183.0	5.9	15
Body, width^a	90.2	12.5	80.0	102.2	13.8	23
Body, width^a	100.4	6.0	93.3	112.0	6.0	15
Somatic ciliary rows, ventral side, number	52.7	3.7	48	58	7.0	14
Somatic ciliary rows, ventral side, number	46.2	5.4	35	56	11.6	10
Somatic ciliary rows, dorsal side, number	52.5	2.6	50	58	4.9	14
Somatic ciliary rows, dorsal side, number	48.8	3.6	42	57	7.4	10
Excretory pores, number	1.1	0.3	1	2	27.2	20
Excretory pores, number	1.0	0	1	1	0	20
Macronucleus, length^b	48.5	5.5	35.0	60.0	11.3	17
Macronucleus, length^b	52.3	5.2	45.0	60.0	9.9	12
Macronucleus, width^b	23.2	3.9	17.3	29.2	16.6	17
Macronucleus, width^b	28.4	5.0	20.0	40.0	17.6	12
Micronucleus, number	2.2	0.8	1	3	35.5	38
Micronucleus, number	2.3	0.6	1	3	27.8	10
Micronucleus, length^b	3.4	0.6	2.5	5.0	17.1	18
Micronucleus, length^b	3.9	1.2	3.0	6.5	32.4	10
Micronucleus, width^b	2.6	0.2	2.3	3.0	8.2	18
Micronucleus, width^b	2.5	0.3	2.5	3.0	12.6	10

Morphometric data for the type population of Frontonia paravernalis sp. nov. from Serchio Italy (IPSal + sm) are shown in bold (upper row). Morphometric data for F. paravernalis population from Peterhof, Russia (FSPBsm), are shown in normal font (lower row)
X̅ Arithmetic mean, SD Standard deviation, Min Minimum, Max Maximum, CV Coefficient of variation in percentage, n Number of investigated cells
^aData based on Chatton–Lwoff silver-stained cells
^bMacro- and micronuclei were measured from Feulgen-stained ciliates. Measurements in μm

ISSN: 2056-3132