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Table 2

The relationship between host species and size of certain anatomical structures of measured specimens of Rhadinorhynchus laterospinosus collected off the Pacific coast of Vietnam in 2016.

Worm sex Character Host species
Auxis thazard (n = 12 males, 15 females) Auxis rochei (n = 18 males, 18 females)
Male Trunk length (mm) 5.75–11.25 (8.09) 4.75–8.37 (6.33)
Female Trunk length (mm) 7.80–26.25 (16.01) 8.00–21.25 (13.16)
Male No. ant. trunk spines in row (dorsal, mid, vent.)* 1–3 (2), 2–4 (3), 1–2 (2) 1–3 (2), 2–4 (3), 1–2 (2)
Female No. ant. trunk spines in row (dorsal, mid, vent.) 1–4 (2), 1–4 (3), 2–4 (3) 2–4 (3), 3–5 (4), 2–5 (3)
Male No. post. trunk spines in row (vent., lateral) 1–4 (3), 5–12 (8) 0–8 (3), 2–23 (9)
Female No. post. trunk spines in row (vent., lateral) 0–13 (6), 1–19 (11) 5–16 (10), 5–31 (17)
Male L of ant. trunk spines (dorsal, mid, vent.) 42–62 (50), 31–42 (36), 21–63 (42) 31–73 (51), 31–52 (43), 31–62 (46)
Female L of ant. trunk spines (dorsal, mid, vent.) 52–86 (64), 42–73 (54), 51–62 (56) 48–72 (60), 31–62 (48), 46–61 (53)
Male L of ventral post. trunk spines (ant., mid, post.) 40–62 (50), 42–66 (52), 20–42 (37) 32–73 (54), 51–83 (63), 40–72 (64)
Female L of ventral post. trunk spines (ant., mid, post.) 42–81 (63), 62–96 (79), 42–73 (59) 52–84 (64), 61–95 (78), 51–95 (67)
Male L of lateral post. trunk spines (ant., mid, post.) 22–32 (29), 31–52 (44), 31–43 (37) 41–52 (40), 40–72 (47), 30–62 (40)
Female L of lateral post. trunk spines (ant., mid, post.) 31–72 (57), 63–86 (65), 42–70 (54) 41–73 (52), 62–82 (68), 41–73 (55)
Female Proboscis length (mm) 1.25–1.82 (1.55) 1.45–1.90 (1.71)
Proboscis hook rows 15–17 (16.4) 15–19 (17.3)
Hook length
Dorsal
Ventral
Dorsal
Ventral
Male Apical prob. hook L 37–40 (39) × 7–10 (9) 42–50 (46) × 11–12 (12) 35–47 (39) × 7–11 (10) 37–50 (44) × 11–12 (11)
Male Subapical prob. hook L × W 45–55 (51) × 10–15 (12) 52–62 (58) × 12–17 (15) 42–60 (53) × 10–12 (12) 47–63 (55) × 12–15 (13)
Male Mid prob. hook L × W 55–60 (58) × 12–14 (13) 60–67 (65) × 14–18 (16) 52–62 (59) × 12 60–77 (67) × 13–18 (15)
Male Post. prob. hook L × W 35–37 (36) × 8–11 (10) 37–47 (42) × 11–13 (12) 27–42 (35) × 7–10 (8) 35–50 (41) × 9–12 (11)
Male Basal prob. hook L × W 50–60 (53) × 11–15 (13) 56–72 (62) × 13–17 (15) 47–55 (51) × 10–14 (11) 55–72 (63) × 12–17 (14)
Female Apical prob. hook L × W 50–60 (54) × 10–12 (11) 52–65 (59) × 11–15 (13) 45–52 (48) × 10–15 (12) 45–60 (53) × 12–15 (14)
Female Subapical prob. hook L × W 60–65 (62) × 13–17 (15) 63–70 (66) × 15–17 (17) 62–72 (65) × 12–20 (15) 60–70 (66) × 14–20 (16)
Female Mid prob. hook L × W 70–77 (73) × 13–17 (15) 73–80 (77) × 20–22 (21) 70–77 (73) × 12–15 (14) 75–78 (76) × 18–20 (19)
Female Post. prob. hook L × W 40–45 (42) × 10–11 (10) 42–50 (48) × 10–15 (12) 32–45 (40) × 10–12 (11) 50–57 (54) × 10–15 (13)
Female Basal prob. hook L × W 65–72 (68) × 10–15 (12) 72–82 (75) × 15–17 (16) 57–82 (68) × 12–17 (14) 75–87 (79) × 12–18 (16)
Male Prob. Recept. L × W (mm) 2.08–3.45 (2.45) × 0.14–0.35 (0.25) 1.62–2.62 (2.28) × 0.15–0.30 (0.21)
Male Anterior testis (mm) 0.69–1.62 (1.19) × 0.31–0.50 (0.40) 0.59–1.75 (0.98) × 0.22–0.52 (0.35)
Male Posterior testis (mm) 0.52–1.25 (0.99) × 0.25–0.57 (0.42) 0.47–1.50 (0.84) × 0.22–0.47 (0.33)
Male Ant. cement glands (mm) 0.78–1.04 (0.95) × 0.17–0.32 (0.24) 0.31–1.09 (0.64) × 0.10–0.27 (0.18)
Male Post. cement glands (mm) 0.78–1.25 (1.05) × 0.17–0.26 (0.21) 0.36–1.09 (0.62) × 0.14–0.26 (0.16)
Male Saefftigen’s pouch (mm) 0.83–1.27 (1.08) × 0.18–0.27 (0.22) 0.42–1.00 (0.78) × 0.15–0.26 (0.20)
*

All observations of trunk spines are made on one side of the trunk.

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