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Table 4

Comparison of measured metrical data (in μm) of Opisthorchis viverrini s.l. cercariae from different snail host taxa in different habitats at different areas between the present study and previous studies.

Source Present study Boonmekam et al. [7] Ngern-klun et al. [36] Scholz et al. [47] Wykoff et al. [63]
Study area BMR Cambodia NTH Lao PDR NETH
Habitat type CNS NST-STWB Rice field Rice field Unspecified
Source of cercariae B. s. siamensis NST-BS B. funiculata BSG BSG
Examination method Shedding NST-MOC Shedding NST-MOC Shedding
Type of specimen Fixed Fixed N/A Fixed Fixed
Fixation method 10% NBF N/A N/A 4% GAiCB Hot formalin
Dyeing method Unstained Unstained + NR N/A Gold coating N/A
Type of microscope CLM CLM CLM SEM N/A
No. of specimens 20 10 N/A N/A N/A
Body width (BW) 87 ± 8 58 ± 12 75 ± N/A
(72–96) (31–42) (33–68) (61–96)
Body length (BL) 183 ± 10 184 ± 24 154 ± N/A
(167–195) (50–62) (100–250) (140–183)
Oral sucker width (OSW) 34 ± 2 36 ± N/A
(30–38) (8–13) (36–37)
Oral sucker length (OSL) 38 ± 3 43 ± N/A
(34–41) (9–14) (34–51)
Ventral sucker width (VSW) 22 ± 1
(19–24) (8–12)
Ventral sucker length (VSL) 24 ± 2
(20–26) (7–13)
Pharynx width (PW) 18 ± 1
(16–20) (5–8)
Pharynx length (PL) 19 ± 1
(17–21) (4–7)
Excretory bladder width (EBW) 41 ± 3
(35–46) (14–18)
Excretory bladder length (EBL) 61 ± 4
(53–67) (10–16)
Tail width (TW) 37 ± 3 30 ± 5 26 ± N/A
(32–41) (16–29)
Tail length (TL) 455 ± 10 417 ± 38 392 ± N/A
(435–471) (85–150) (360–475) (350–437)
Transversely striated tail-tegument width (TSTW) 62 ± 3
(58–65)
Transversely striated tail-tegument length (TSTL) 173 ± 10
(154–186)
Dorso-ventral finfold width (DFW) 34 ± 2
(31–37)
Dorso-ventral finfold length (DFL) 325 ± 13
(310–349)
Total length 624 ± 20 532 ± N/A
(593–651) (490–565)

Abbreviations: NTH = northern Thailand; NETH = northeastern Thailand; NST-STWB = no specified type of standing-water body (rice field, seasonal lake or pond); NST-BS = no specified taxon of B. siamensis; BSG = B. s. goniomphalos; NST-MOC = no specified method to obtain the cercariae; 4% GAiCB = 4% glutaraldehyde in cacodylate buffer; CLM = compound light microscope; SEM = scanning electron microscope. The insertion of single hyphenation (–) without numbers on either side and N/A means that data have not been specified.

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