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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