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.
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.
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.
Table 1
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).
| Characters | D. melapteruri | D. mujibi | D. mormyropsis | Dujardinascaris spp. |
|---|---|---|---|---|
| Length ♂ | 14.8 | 17 – 24 | 11.5 – 15.33 | 10 – 14.2 |
| ♀ | 12.3 – 35.0 | 23 – 38 | 26 – 43.22 | 13 – 22.5 |
| Width ♂ | 0.3 | 0.25 – 0.65 | 0.38 – 0.54 | 0.33 – 0.47 |
| ♀ | 0.25 – 0.68 | 0.76 – 0.84 | 0.089 – 0.1 | 0.18 – 0.34 |
| Lips L. ♂ | 70 μm | – | 75 – 90 μm | 70 – 98 μm |
| ♀ | 50 – 110 μm | 135 – 159 μm | 50 – 90 μm | |
| Interlabia L. ♂ | – | – | 30 – 45 μm | 33 – 41 μm |
| ♀ | 78 – 96 μm | 40 – 60 μm | ||
| Esophagus L. ♂ | 1.7 | 2.25 – 2.75 | 1.32 – 1.84 | 1.21 – 1.66 |
| ♀ | 1.3 – 2.6 | 4.45 – 5.84 | 2.2 – 3.07 | 1.67 – 2.1 |
| Esophagus W. ♂ | – | 0.11 – 0.15 | 0.08 – 0.11 | 0.062 – 0.071 |
| ♀ | 0.15 – 0.18 | 0.09 – 0.12 | 0.07 – 0.082 | |
| Nerve ring * ♂ | 0.35 | – | 0.42 – 0.56 | 0.35 – 0.37 |
| ♀ | 0.27 – 0.41 | 0.58 – 0.77 | 0.41 – 0.52 | |
| Excretory pore *♂ | 0.36 | – | 0.42 – 0.56 | 0.36 – 0.39 |
| ♀ | 0.4 | 0.58 – 0.81 | 0.46 – 0.57 | |
| Intestinal canal ♂ | 1.1 | – | 0.68 – 1.11 | 0.71 – 1.33 |
| ♀ | 0.77 – 2 | 1.19 – 1.73 | 1.11 – 1.43 | |
| Tail L. | 0.08 | – | 0.12 – 0.17 | 0.11 – 0.17 |
| 0.15 – 0.41 | ||||
| Spicule L. | 1.4 μm | 1.13 – 1.34 μm | 1.7 – 1.81 μm | 2.23 – 3.45 μm |
| Gubernaculum L. | – | – | 0.186 – 0.2 | 0.08 – 0.11 |
| Vulva * | – | – | 9.13 – 15.92 | 0.093 – 1.15 |
| Egg L. | – | – | 0.06 – 0.09 | 0.052 – 0.09 |
| Egg W. | – | – | 0.052 – 0.072 | 0.04 – 0.078 |
| Caudal alae | Absent | Absent | Absent | present |
| Host species | Malapterurus electricus | Pagrus pagrus | Mormyrops anguilloides | Mullus surmuletus |
| Locality | Khartoum, Sudan | Red Sea, Egypt | Central Africa | Mediterranean Sea, Egypt |
| Author | Sprent, (1990) | Morsy et al. (2013) | Moravec & Jirku, (2014) | Present study (2019) |
[i] Abbreviations: L.=length; W.=width; ♂= male; ♀=female; * From anterior extremity