Descriptions of acanthocephalans, Cathayacanthus spinitruncatus (Rhadinorhynchidae) male and Pararhadinorhynchus magnus n. sp. (Diplosentidae), from marine fish of Vietnam, with notes on Heterosentis holospinus (Arhythmacanthidae)

Nguyen Van Ha; Omar M. Amin; Ha Duy Ngo; Richard A. Heckmann

doi:10.1051/parasite/2018032

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Volume 25 (2018)

Parasite, 25 (2018) 35

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Research Article

Table 1.

Morphometric comparisons among species of Pararhadinorhynchus.

	P. mugilis		P. coorongenis		P. magnus n. sp.
Characters	Johnston & Edmunds [22]		Edmunds [15]		This paper
	Males	Females	Males	Females	Male	Females
Trunk size (mm)	3.1–11.4 × 0.23–0.61	3.9–19.2 × 0.22–0.69	7.0–11.0 × 0.40–0.70	9.0–15.0 × 0.45–0.55	22.50–43.75 (35.22) × 0.60–1.20 (0.93)	57.00–71.25 (63.17) × 0.77–1.37 (1.14)^•
Proboscis size	900 × 200	900 × 200	500–580 × 0.12–0.23	510–520 × 0.15–0.22	648–950 (840) × 95–130 (108)	915–1170 (1025) × 100–125 (112)
Hook rows/per row	18/16–17	18/16–17	14–16 (16)/8–10 (9)	14–16 (16)/8–10 (9)	15–16 (15.25)/22–25 (24.50)	14–16 (15.25)/24–27 (25.50)
Longest & smallest hooks	21 & 5 (Fig. 11)	21 & 5 (Fig. 11)	50 & 25 (Fig. 2)	50 & 25 (Fig. 2)	——–	35 & 22
Hook roots	Shorter than blades, post. hooks rootless	Shorter than blades, post. hooks rootless	As long as blades, post. 4 hook rootless	As long as blades, post. 4 hook rootless	As long as blades, reduced posteriorly	As long as blades, reduced posteriorly
Neck size	0.15–0.25 × ——–	0.15–0.25 × ——–	150 × ——–	150 × ——–	166–208 (192) × 166–260 (246)	187–208 (198) × 229–239 (232)
Receptacle size (mm)	0.61–1.3 × 0.12–0.20	0.61–1.3 × 0.12–0.20	0.6–0.8 × 0.18–0.26	0.6–0.8 × 0.18–0.26	1.30–2.18 (1.86) × 0.16–0.25 (0.21)	1.40–2.25 (1.91) × 0.19–0.24 (0.21)
Cephalic ganglion size	——–	——–	——–	——–	187–260 (213) × 20–78 (58)	230–364 (299) × 73–83 (78)
Lemnisci size (mm)	0.80 × ——– (as long as recept.)	0.80 × ——– (as long as recept.)	Twice as long as receptacle	Twice as long as receptacle	Twice or same as long as receptacle	Twice or same as long as receptacle
Ant. testis size (mm)	0.28–1.1 × 0.08–0.24	N/A	0.45–1.05 × 0.35–0.45	N/A	1.12–2.20 (1.82) × 0.62–1.07 (0.91)	N/A
Post. Testis size (mm)	0.27–1.1 × 0.08–0.23	N/A	0.50–0.9 × 0.34–0.43N/A	1.25–2.25 (1.89) × 0.57–0.87 (0.75)	N/A
Cement gland size (mm)	0.45–2.5 × ——–	N/A	2, long & slender	N/A	4.25–10.62 (7.52) × 0.17–0.25 (0.22) and 0.25–0.37 (0.32)	N/A
Cement gl. Duct size (mm)	——–	N/A	——–	N/A	1.07–1.75 (1.36) × 0.11–0.18 (0.14)	N/A
Safftigen’s pouch size (mm)	——–	N/A	——–	N/A	1.04–1.62 (1.27) × 0.26–0.37 (0.30)	N/A
Bursa size (mm)	——–	N/A	——–	N/A	0.75–0.87 (0.81) × 1.00	N/A
Fem. reproductive syst.	N/A	——–	N/A	2.8–3.4	N/A	1.60–1.72 (1.66)
Vagina length	N/A	150 (ganglionic complex ?)	N/A	——–	N/A	0.19–0.21 (0.20)
Uterus length (mm)	——–	1.1–1.4	N/A	——–	N/A	0.88–1.09 (0.99)
Uterine bell length	N/A	200	N/A	——–	N/A	260–340 (300)
Uterus glands area length	N/A	——–	N/A	——–	N/A	0.21–0.27 (0.24)
Egg size	N/A	52–62 × 13–18	N/A	42–46 × 8–10	N/A	52–65 × 15–18
Gonopore	Terminal	Terminal	Terminal	Terminal	Terminal	Subterminal
Host	Mugil cephalus	Mugil cephalus	Aldrichetta forsteri	Aldrichetta forsteri	Scatophagus argus	Scatophagus argus
Geography	Australia	Australia	Australia	Australia	Vietnam	Vietnam

^•

Range (mean) measurements are in micrometers unless otherwise specified.

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