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Table 3 Comparative morphometrics Steinernema siamkayai (IIVR JNC01 strain) with original description. All measurements are in micrometers (μm) (except percentage) and in the form of mean (range)

From: Isolation, identification and biocontrol potential of entomopathogenic nematodes occurring in Purvanchal and Bundelkhand regions of Uttar Pradesh, India

Infective juveniles (n = 20) L GW EP NR TL a b c D% E%
Steinernema siamkayai 446
(398–495)
21
(18–24)
35
(29–38)
72
(68–80)
35.5
(31–41)
21
(19–23)
4.7
(4.0–6.1)
11.3
(10.3–14.8)
37
(31–43)
96
(85–112)
Steinernema siamkayai (IIVR JNC01 strain) 464
(452–472)
20.8 (18–23) 34.2 (32–36) 78
(70–86)
35.3
(32–40)
22.4
(19.9–26.1)
4.6
(4.2–5.5)
13.2
(11.4–14.8)
34
(30–40)
97.4
(82–106)
First generation female (n = 20) L GW EP NR TL ML V%
Steinernema siamkayai 3937
(3161–5172)
198
(170–280)
66
(50–84)
133
(116–147)
31
(22–37.5)
7.0
(4.5–11)
51
(48–53)
Steinernema siamkayai (IIVR JNC01 strain) 4492
(3897–4921)
231.4
(181–273)
64.4
(61–68)
137
(119–151)
31
(23–37)
7.9
(5.2–10.4)
48.7
(47–50)
Second generation female (n = 20) L GW EP NR TL ML V%
Steinernema siamkayai 1836
(1410–2560)
105
(83–128)
68
(65–70.5)
123
(113–130)
41
(28–52)
4.5
(3–6)
51
(53–58)
Steinernema siamkayai (IIVR JNC01 strain) 1867
(1812–1919)
109
(85–124)
66.9
(65.5–69)
124
(115–134)
38.9
(31–49)
4.4
(3.2–6.2)
53.4
(50–56.5)
First generation
male (n = 20)
L GW EP NR TL ML SL GL SW GS D%
Steinernema siamkayai 1135
(1035–1278)
139.5
(107–159)
57
(47.5–67)
91
(81–101)
27.5
(22–32)
3
(2.5–3.5)
77.5
(75–80)
53.5
(47–65)
1.70
(1.4–2.2)
0.7
(0.6–0.8)
42
(35–49)
Steinernema siamkayai (IIVR JNC01 strain) 1193
(1098–1324)
142
(102–152)
60.3
(59–66)
86.6
(79–102)
26.1
(20–32)
3.1
(2.6–3.7)
77.7
(76–79)
55.8
(45–67)
1.67
(1.36–2.17)
0.72
(0.57–0.88)
43.2
(40–45)
Second generation
male (n = 20)
L GW EP NR TL ML SL GL SW GS D%
Steinernema siamkayai 830
(716–952)
57
(47–75)
58
(54–68)
85
(80–91)
22
(19–33)
3
(2–4)
62
(55–73)
41.5
(37–55)
2.13
(2.2–2.35)
0.69
(0.66–0.75)
51
(49–56)
Steinernema siamkayai (IIVR JNC01 strain) 855
(785–906)
65.4
(48–78)
60.8
(59–66)
84
(78–89)
22.2 (20–27) 2.8
(2.2–3.8)
59.7
(55–63)
42.2
(39–46)
2.09
(1.87–2.37)
0.70
(0.67–0.75)
49.4
(47–54)
  1. L body length, GW greatest width, EP distance from the anterior end to excretory pore, NR distance from the anterior end to nerve ring, ML Mucro length, SL spicule length, GL gubernaculum length, SW spicule length divided by anal body diameter, GS gubernaculum length divided by spicule length, V% distance from anterior end to end vulva as percentage of length, D% distance from anterior end to excretory pore divided by distance from anterior end to end of pharynx/esophagus × 100, E% distance from anterior end to excretory pore divided by tail length × 100