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Table 2 Morphometrics of Steinernema siamkayai (IIVR JNC01 strain) (measurements are in μm and in the form of mean ± SD (range)

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

Character Infective juveniles (IJ’s) (n = 20) First generation Second generation
Females (n = 20) Males (n = 20) Females (n = 20) Males (n = 20)
Body length (L) 464 ± 6.6
(452–472)
4492 ± 264.8
(3897–4921)
1193 ± 84.7
(1098–1324)
1867 ± 37.6
(1812–1919)
855 ± 44.4
(784–906)
Greatest body width 20.8 ± 1.3
(18–23)
231.4 ± 22.1
(181–273)
142.1 ± 10.5
(102–152)
109 ± 10.3
(85–124)
65.4 ± 9.9
(48–78)
EP 34.2 ± 1.2 (32–36) 64.4 ± 2.6 (61–68) 60.3 ± 2.2 (59–66) 66.9 ± 1.5 (65.5–69) 60.8 ± 2.1 (59–66)
ES 101.1 ± 8.9
(83–112)
177.2 ± 14
(149–196)
138.3 ± 4.2
(132–145)
153.6 ± 6.4
(142–164)
123.4 ± 6.5
(110–131)
NR 78.0 ± 4.2 (70–86) 137 ± 9.2 (119–151) 86.6 ± 7.1 (79–102) 124 ± 5.5 (115–134) 84.0 ± 3.3 (78–89)
Tail length (TL) 35.3 ± 2.6 (32–40) 31 ± 4.9 (23–37) 26.1 ± 3.8 (20–32) 38.9 ± 4.7(31–49) 22.2 ± 2.2 (20–27)
Body width at cloaca 47.5 ± 6.6 (35–58) 28.6 ± 1.2 (27–30)
Spicule length 77.7 ± 1.2 (76–79) 59.7 ± 2.5 (55–63)
Spicule width 8.5 ± 0.5 (7.7–9.3) 5.9 ± 0.4(5.0–6.8)
Gubernaculum length 55.8 ± 7.3(45–67) 42.2 ± 2.3 (39–46)
Gubernaculum width 5.4 ± 0.8 (3.8–6.7) 3.7 ± 0.4 (3.0–4.7)
Mucro length 7.9 ± 1.4 (5.2–10.4) 3.1 ± 0.3(2.6–3.7) 4.4 ± 1 (3.2–6.2) 2.8 ± 0.5 (2.2–3.8)
a 22.4 ± 1.5 (19.9–26.1)
b 4.6 ± 0.4 (4.2–5.5)  
c 13.2 ± 0.9 (11.4-14.3)  
SW 1.67 ± 0.2
(1.36–2.17)
  2.09 ± 0.1
(1.87–2.37)
GS 0.72 ± 0.1 (0.57–0.88)   0.7 ± 0.1 (0.66–0.75)
V% 48.7 ± 1.0 (47–50) 53.4 ± 2.0 (50–56.5)
D% {(EP/ES)*100)} 34.0 ± 2.9 (30–40) 43.2 ± 1.7 (40–45) 49.4 ± 3.0 (47–54)
E% {(EP/TL)*100)} 97.4 ± 7.0
(82–106)
237.2 ± 38.5
(184.3–309)
276.6 ± 21.5
(226–300)
  1. EP distance from anterior end to excretory pore, NR distance from anterior end to nerve ring, ES distance from anterior end to end of pharynx/esophagus, a body length/body width, b body length/ES, c body length/tail 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