Untangling the Derogenes varicus species complex in Scandinavian waters and the Arctic: description of Derogenes abba n. sp. (Trematoda, Derogenidae) from Hippoglossoides platessoides and new host records for D. varicus (Müller, 1784) sensu stricto

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Table 5

Measurements of Derogenes abba n. sp. from Hippoglossoides platessoides off Svalbard and Derogenes spp. first described from the Pacific, Antarctic, and Indian Ocean. *Diameter.

Species	Derogenes abba n. sp.	D. chelidonichthydis Shen, 1989	D. gadi Shen, 1990	D. macrostoma Yamaguti, 1938	Derogenes magnus Wang, 1991	D. minoi Shen, 1990	D. johnstoni Prudhoe & Bray, 1973	D. hyderabadensis Jaiswal, 1967
Host	Hi. Platessoides	Chelidonichthys kumu	Gadus macrocephalus	Inimicus japonicus	Mugil cephalus	Minous monodactylus	Artedidraco shackletoni	Channa punctata
Locality	Svalbard, Arctic Ocean	Jiaozhou Bay, China, NWP	Yellow Sea, China, NWP	Fukui, Japan, NWP	Fujian, China, NWP	Changjiang Estuary, China, NWP	Antarctic region	Hyderabad, India, Indian Ocean
Source	Present study	[60]	[58]	[72]	[69]	[59]	[54]	[24]
N.	14	–	1	2	–	1	2	1
Body length	1100–1450	2091	3332	3000–3200	4000	2346	1700–2400	2560
Body width	370–450	527	748	700–950	1200	748	600–840	650
Forebody	396–485	–	–	–	–	1088	–	–
Hindbody	350–400	–	–	–	–	663	–	–
Preoral lobe length	20–38	51	–	24–80	–	34	25–28	–
Ventral sucker	226–425 × 210–430	374	561*	750–800*	640 × 618	561 × 510	500–530	570 × 530
Oral sucker	95–180 × 110–225	153 × 187	221 × 255	440–460 × 510	336 × 352	340 × 408	¹	320 × 280
Pharynx	61–97 × 64–93	85 × 102	119	150 × 210	160 × 152	136 × 170	140 × 100	–
Sinus sac	93–102 × 84–99	85 × 65	170 × 136	200*		221 × 102	–	–
Seminal vesicle	56–80 × 38–65	119 × 85	–	–	192 × 128		–	–
Left testis	150–119 × 84–110	68 × 51	221 × 136	160–200 × 250–275	240 × 224	119 × 204	–	160 × 150
Right testis	136–148 × 113–154	–			288 × 240	88 × 153	–	210 × 110
Ovary	120–182 × 110–168	119	170 × 204	188–225 × 250–260	480 × 192	170*	–	210 × 130
Left vitelline mass	201–256 × 136–207	170 × 119	306 × 289	250–310 × 150–240	400 × 240	289 × 136	–	180 × 70
Right vitelline mass	181–280 × 133–185	–	–	–	352 × 240	289 × 136	–	180 × 130
Eggs	40–52 × 28–34	48–57 × 30–33	48–51 × 27–30	57–66 × 36–42	60–66 × 35–36	51–60 × 30–36	–	31–41 × 14–16

Abbreviations: NWP, Northwest Pacific; N., number of specimens.

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