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Morphological characterization of Dujardinascaris spp. (Nematoda: Anisakidae) from the striped red mullet Mullus surmuletus in the Mediterranean Sea

R. Gamal Taha Hassan
R. Gamal Taha Hassan
   | 06 nov 2019
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Article Category: Research Note
Pubblicato online: 06 nov 2019
Pagine: 338 - 346
Ricevuto: 14 giu 2019
Accettato: 04 set 2019
DOI: https://doi.org/10.2478/helm-2019-0032
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© 2019 R. Gamal Taha Hassan, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Fig. 1

(A – E): Dujardinascaris spp. from Red Mullet Mullus surmuletus in Mediterranean Sea. A: Anterior end of male dorsal view, B: cephalic region of male, C: The posterior end of female subventral view, D: The posterior end of male ventral view, E: Egg. Scale bars: A,C 0.2; B 200 μm; D 0.3; E 50 μm.
(A – E): Dujardinascaris spp. from Red Mullet Mullus surmuletus in Mediterranean Sea. A: Anterior end of male dorsal view, B: cephalic region of male, C: The posterior end of female subventral view, D: The posterior end of male ventral view, E: Egg. Scale bars: A,C 0.2; B 200 μm; D 0.3; E 50 μm.

Fig. 2

(A – F): Scanning Electron Microscope of Dujardinascaris spp. (A): The cephalic region of the worm with interlocked processes, A amphid, L lip, It interlabium, T teeth, DP double papillae, SP single papilla, CP cuticular prolongation. (B): the anterior end showing the cephalic lateral pouches (arrows). (C): The middle region of nematode body showing the cuticular transverse striations. (D): The vulvar region with protruded vagina V. (E): The dorsal view of somatic region showing the longitudinal annulation LA, large rounded-like papilla LP. (F): The post-equatorial part of nematode body showing papillae P. Scale bars: A,D,H,I,K,L = 50 μm, B,C,EF,G,J = 10 μm.
(A – F): Scanning Electron Microscope of Dujardinascaris spp. (A): The cephalic region of the worm with interlocked processes, A amphid, L lip, It interlabium, T teeth, DP double papillae, SP single papilla, CP cuticular prolongation. (B): the anterior end showing the cephalic lateral pouches (arrows). (C): The middle region of nematode body showing the cuticular transverse striations. (D): The vulvar region with protruded vagina V. (E): The dorsal view of somatic region showing the longitudinal annulation LA, large rounded-like papilla LP. (F): The post-equatorial part of nematode body showing papillae P. Scale bars: A,D,H,I,K,L = 50 μm, B,C,EF,G,J = 10 μm.

Fig. 2

(G – M): Scanning Electron Microscope of Dujardinascaris spp. (G): The ventral surface of the worm at cuticular region showing buttom-like papilla (arrow). (H): The cuticle at the posterior region of female worm showing the transverse striations. (I): The posterior end of female showing anus An & the caudal alae (arrows). (J): The cuticle at the anal region showing the transverse striations. (K): The posterior end of male showing the cuticular transverse striations. (L): The posterior end of male showing spicules (arrows). Scale bars: A,D,H,I,K,L = 50 μm, B,C,EF,G,J = 10 μm.
(G – M): Scanning Electron Microscope of Dujardinascaris spp. (G): The ventral surface of the worm at cuticular region showing buttom-like papilla (arrow). (H): The cuticle at the posterior region of female worm showing the transverse striations. (I): The posterior end of female showing anus An & the caudal alae (arrows). (J): The cuticle at the anal region showing the transverse striations. (K): The posterior end of male showing the cuticular transverse striations. (L): The posterior end of male showing spicules (arrows). Scale bars: A,D,H,I,K,L = 50 μm, B,C,EF,G,J = 10 μm.

Morphometric comparison of some species of nematode Dujardinascaris from fishes with the present species.(The data for the previous described species are taken from the original descriptions).

CharactersD. melapteruriD. mujibiD. mormyropsisDujardinascaris spp.
Length ♂14.817 – 2411.5 – 15.3310 – 14.2
♀12.3 – 35.023 – 3826 – 43.2213 – 22.5
Width ♂0.30.25 – 0.650.38 – 0.540.33 – 0.47
♀0.25 – 0.680.76 – 0.840.089 – 0.10.18 – 0.34
Lips L. ♂70 μm–75 – 90 μm70 – 98 μm
♀50 – 110 μm135 – 159 μm50 – 90 μm
Interlabia L. ♂––30 – 45 μm33 – 41 μm
♀78 – 96 μm40 – 60 μm
Esophagus L. ♂1.72.25 – 2.751.32 – 1.841.21 – 1.66
♀1.3 – 2.64.45 – 5.842.2 – 3.071.67 – 2.1
Esophagus W. ♂–0.11 – 0.150.08 – 0.110.062 – 0.071
♀0.15 – 0.180.09 – 0.120.07 – 0.082
Nerve ring * ♂0.35–0.42 – 0.560.35 – 0.37
♀0.27 – 0.410.58 – 0.770.41 – 0.52
Excretory pore *♂0.36–0.42 – 0.560.36 – 0.39
♀0.40.58 – 0.810.46 – 0.57
Intestinal canal ♂1.1–0.68 – 1.110.71 – 1.33
♀0.77 – 21.19 – 1.731.11 – 1.43
Tail L.0.08–0.12 – 0.170.11 – 0.17
0.15 – 0.41
Spicule L.1.4 μm1.13 – 1.34 μm1.7 – 1.81 μm2.23 – 3.45 μm
Gubernaculum L.––0.186 – 0.20.08 – 0.11
Vulva *––9.13 – 15.920.093 – 1.15
Egg L.––0.06 – 0.090.052 – 0.09
Egg W.––0.052 – 0.0720.04 – 0.078
Caudal alaeAbsentAbsentAbsentpresent
Host speciesMalapterurus electricusPagrus pagrusMormyrops anguilloidesMullus surmuletus
LocalityKhartoum, SudanRed Sea, EgyptCentral AfricaMediterranean Sea, Egypt
AuthorSprent, (1990)Morsy et al. (2013)Moravec & Jirku, (2014)Present study (2019)
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