Hexabothriid monogeneans from the gills of deep-sea sharks off Algeria, with the description of Squalonchocotyle euzeti n. sp. (Hexabothriidae) from the kitefin shark Dalatias licha (Euselachii, Dalatiidae)

Kheddam, H.; Justine, J.-L.; Tazerouti, F.

doi:10.1515/helmin-2016-0034

Figures & Tables

Squalonchocotyle euzeti n. sp. from Dalatias licha off Algeria. A, holotype, whole body. Due to the slender body, only limited anatomy is represented. Asterisk, level of seminal receptacle (outline of seminal receptacle drawn) and ovary. B – G, sclerites. H – J, extremities of sclerites.For A – J, numbers of sclerites are indicated. K, hamuli of various specimens. A – J, holotype; K, paratypes.

Squalonchocotyle euzeti n. sp. Anatomy of anterior part of reproductive system

Squalonchocotyle euzeti n. sp.Anatomy of median part of reproductive system

“Large” species of Squalonchocotyle_ Measurements in various publications and comparison with the new species S_ euzeti_

Species	S. borealis	S. borealis	S. laymani	S. euzeti n. sp.	S. euzeti n. sp.
Source	Van Beneden, 1853	Cerfontaine, 1899	Yamaguti, 1958	This paper	This paper
Name in original description	Onchocotyle borealis	Squalonchocotyle borealis	Squalonchocotyle laymani
Host name in original description	Scimnus glacialis	Scimnus glacialis	Mustelus manazo	Dalatias licha	Dalatias licha
Host valid name	Somniosus microcephalus (Bloch et Schneider, 1801)	Somniosus microcephalus (Bloch et Schneider, 1801)	Mustelus manazo Bleeker, 1855	Dalatias licha (Bonnaterre, 1788)	Dalatias licha (Bonnaterre, 1788)
Locality	Atlantic, North Sea (Belgium)	Atlantic, North Sea (Belgium)	Pacific (Japan)	Mediterranean (Algeria)	Mediterranean (Algeria)
n		6	5	Holotype	31 paratypes
Total body length	25,000 – 30,000	20,000 (unflattened)	8,500 – 14,000	18,463	12,921±3,289 (7,326 – 21,830, n=32)
Body proper width	3,000 – 4,000		1,200 – 1,400	1,628	1,078±239 (777 – 1,813, n = 32)
Anterior sucker diameter			310 – 390
Anterior sucker length				306	286 (201 – 410, n = 20)
Anterior sucker width				366	343 (261 – 448, n = 20)
Pharynx diameter			70 – 110
Pharynx length				194	179 (112 – 246, n = 21)
Pharynx width				149,2	164 (119 – 216, n = 21)
Haptor length				4,051	2,428 (1,758 – 4,051, n = 12)
Haptor width				3,552	2,450 (1,610 – 3,552, n = 12)
Anterior sclerite length		2,228 *** From measurements on drawings	750 – 920	1,638	1,763 (1,130 – 2,906, n = 20)
Median sclerite length			600 – 620	1,675	1,851 (1,171 – 2,909, n = 20)
Posterior sclerite length			600 – 620	1,586	1,749 (1,089 – 2,738, n = 20)
Appendix length			800 – 1,100	1,029	872 (522 – 1,186, n = 10)
Appendix width			400 – 530	306	207 (142 – 336, n = 10)
Hamulus length			40 – 50
Hamulus outer length		83 *** From measurements on drawings		87	70 (59 – 87, n=13)
Hamulus inner length		66 *** From measurements on drawings		74	63 (44 – 74, n = 13)
Testes number	numerous		100 or more	82	82 (69 – 96, n = 10)
Cirrus length			130 – 150	307	421 (307 – 551, n = 7)
Cirrus width			120 – 150
Eggs proper length		250	450		539 (463 – 644, n = 5)
Egg filament number and length			2; 100 – 150		2
Seminal receptacle length			250 – 420	410	667 (522 – 858, n = 11)

“Small” species of Squalonchocotyle_ Measurements in various publications

Species	S. abbreviata	S. centrophori	S. cerfontaini	S. mitsukurii	S. cerfontaini	S. spinacis	S. squali	S. squali	S. squali	S. squali	S. tropai	S. tropai
Source	Cerfontaine, 1899	Maillard, 1970	Maillard, 1970	Kitamura et al., 2006	This paper	Goto, 1894	MacCallum, 1931	Price, 1942	Dillon & Hargis, 1968	Martorelli et al., 2008	Tendeiro & Valdez, 1955	Maillard, 1966
Name in source	Onchocotyleabbreviata	Squalonchocotylecentrophori	Squalonchocotylecerfontaini	Squalonchocotylemitsukurii	S. cerfontaini	Onchocotylespinacis	Squalonchocotyle squali	Erpocotyle squali	Erpocotyle squali	Squalonchocotyle squali	Erpocotyle tropai	Squalonchocotyletropai
Host name in source	Acanthias vulgaris	Centrophorusgranulosus	Dalatias licha	Squalus mitsukurii	Dalatias licha	Spinax sp	Squalus acanthias	Squalus acanthias	Squalus lebruni	Squalus acanthias	Squalus fernandinus	Squalus fernandinus
Host valid name	Squalus acanthias Linnaeus, 1758	Centrophorus granulosus (Bloch et Schneider, 1801)	Dalatias licha (Bonnaterre, 1788)	Squalus mitsukurii Jordan et Snyder, 1903	Dalatias licha (Bonnaterre, 1788)		Squalus acanthias Linnaeus, 1758	Squalus acanthias Linnaeus, 1758	Squalus acanthias Linnaeus, 1758	Squalus acanthias Linnaeus, 1758	Squalus acanthias Linnaeus, 1758	Squalus acanthias Linnaeus, 1758
Locality	East Atlantic (Roscoff, France)	Mediterranean (Sète, France)	Mediterranean (Sète, France)	Pacific (Japan)	Mediterranean (Sète, France) MNHN 711 H, Ti 52	Pacific (Japan)	Several	Atlantic (USA)	Pacific (New Zealand)	Atlantic (Argentina)	Indo-Pacific (Angola)	Mediterranean (Sète, France)
n		7	2	13	1		several	13	56	11	2	4
Total body length	7,000 – 8,000	3,300 – 7,500	3,000	3,200 – 7,500	3,533	8,000 – 9,000	7,000 – 10,000	3,400 – 7,000	4,310 – 6,650	4,760 – 6,960	1,420 – 1,690	1,700 – 2,300
Body proper width		1,000 – 1,500	350	500 – 1,200	407	–	1,500	765 – 935	620 – 1,060	62 – 87	680 – 690	330 – 450
Anterior sucker diameter		340 – 420	200					220 – 228		190 – 270		200 – 250
Length				190 – 350	170
Width				250 – 430	218
Pharynx diameter			120 – 130					75		50 – 120
Pharynx length		120		70 – 120	130				84 – 117			57 – 67
Pharynx width		60		60 – 120	122				61 – 69			40 – 60
Haptor length		900 – 1,400		1,000 – 2,800	1,147			1,300		1,120 – 1,260	400 – 510	546
Haptor width		700 – 1,000		800 – 1,700	1240					830 – 1,250	600 – 660	336
Anterior sclerite length		650 – 770	560 – 650	230 – 300	654		280	500 – 600	325 – 480	570 – 910		300 – 350
Median sclerite length		680 – 800	580 – 690	230 – 300	683		280	500 – 600	366 – 480	570 – 910		290 – 360
Posterior sclerite length		660 – 770	560 – 630	190 – 238	650		280	430 – 600	337 – 494	570 – 910		310 – 330
Appendix length			400	800 – 1,900	537			765 – 935	641 – 925	740 – 1,350	440 – 450	300 – 370
Appendix width			200	250 – 500	185			255 – 340		100 – 210	200 – 220	200 – 230
Hamulus length		47 – 61	63 – 70	55 – 65	85	40	72	72	61 – 72	50 – 70		37.5 – 42.5
Hamulus outer length				8 – 16	59					14 – 18
Hamulus inner length				15 – 23	61					12 – 14
Testes number		30 – 40	100 – 150	25 – 40			25	60	40 – 60	30 – 69	numerous	few
Cirrus bulb
Cirrus length		650	350	200 – 370						75 – 100
Cirrus width		40		60 – 110						40 – 50
Egg, proper length	100			125 – 360			320	285 – 340	210 – 247	250 – 350	230	220
Egg, filament number & length	2			2			2	2		2; 50 – 60	2
Seminal receptacle length
Seminal receptacle length				210 – 350	241					400 – 550
Seminal receptacle width				75 – 160	155					100 – 150

Hexabothriid monogeneans from the gills of deep-sea sharks off Algeria, with the description of Squalonchocotyle euzeti n. sp. (Hexabothriidae) from the kitefin shark Dalatias licha (Euselachii, Dalatiidae)

Figures & Tables

Fig. 1

Fig. 2

Fig. 3

“Large” species of Squalonchocotyle_ Measurements in various publications and comparison with the new species S_ euzeti_

“Small” species of Squalonchocotyle_ Measurements in various publications

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