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Morphological and genetic identification of the gill monogenean parasite (Diclidophora merlangi) that infects Twobar Seabream Fish (Acanthopagrus bifasciatus) in the Arabian Gulf, Saudi Arabia

G. Alojayri
G. Alojayri
, 
S. Al-Quraishy
S. Al-Quraishy
, 
E. Al-Shaebi
E. Al-Shaebi
, 
O. B. Mohammed
O. B. Mohammed
 e 
R. Abdel-Gaber
R. Abdel-Gaber
   | 16 lug 2024
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Pubblicato online: 16 lug 2024
Pagine: 184 - 193
Ricevuto: 04 mar 2024
Accettato: 16 apr 2024
DOI: https://doi.org/10.2478/helm-2024-0012
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© 2024 G. Alojayri et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Photomicrographs of Diclidophora merlangi infecting Acanthopagrus bifasciatus. (A) Whole-mount preparation. (B–K) High magnifications for different body parts, as follows: (B–F) Anterior portion of the prohaptor. (G) Germarium. (H) Testes. (I–K) Clamps in haptor. Note: MO, mouth; BS, buccal sucker; PH, pharynx; GC, gland cells; OE, oesophagus; MCO, male copulatory organ; IC, intestinal crura; V, vitellaria; VR, vitelline reservoir; G, germarium; TE, testes; CL, clamps; HA, haptor; LS, lateral sclerite; MS, median sclerite; ND, nodular openings.
Photomicrographs of Diclidophora merlangi infecting Acanthopagrus bifasciatus. (A) Whole-mount preparation. (B–K) High magnifications for different body parts, as follows: (B–F) Anterior portion of the prohaptor. (G) Germarium. (H) Testes. (I–K) Clamps in haptor. Note: MO, mouth; BS, buccal sucker; PH, pharynx; GC, gland cells; OE, oesophagus; MCO, male copulatory organ; IC, intestinal crura; V, vitellaria; VR, vitelline reservoir; G, germarium; TE, testes; CL, clamps; HA, haptor; LS, lateral sclerite; MS, median sclerite; ND, nodular openings.

Fig. 2.

A consensus phylogenetic tree constructed with maximum likelihood (ML) and Neighbor Joining (NJ) methods from the partial 28S rRNA sequences, showing phylogenetic relationships between Diclidophora merlangi infecting Acanthopagrus bifasciatus (2 sequences (OR889477-OR889478)) and 22 related taxa in NCBI GenBank with Discocotyle sagittata as an outgroup. Numbers indicated at branch nodes are bootstrap values (ML/NJ).
A consensus phylogenetic tree constructed with maximum likelihood (ML) and Neighbor Joining (NJ) methods from the partial 28S rRNA sequences, showing phylogenetic relationships between Diclidophora merlangi infecting Acanthopagrus bifasciatus (2 sequences (OR889477-OR889478)) and 22 related taxa in NCBI GenBank with Discocotyle sagittata as an outgroup. Numbers indicated at branch nodes are bootstrap values (ML/NJ).

Fig. 3.

A consensus phylogenetic tree constructed with maximum likelihood (ML) and Neighbor Joining (NJ) methods from the partial COI sequences, showing phylogenetic relationships between Acanthopagrus bifasciatus (one sequence (OR945709)) and 19 related taxa in NCBI GenBank with Rhabdosargus haffara as an outgroup. Numbers indicated at branch nodes are bootstrap values (ML/NJ).
A consensus phylogenetic tree constructed with maximum likelihood (ML) and Neighbor Joining (NJ) methods from the partial COI sequences, showing phylogenetic relationships between Acanthopagrus bifasciatus (one sequence (OR945709)) and 19 related taxa in NCBI GenBank with Rhabdosargus haffara as an outgroup. Numbers indicated at branch nodes are bootstrap values (ML/NJ).

Comparative metrical data for Diclidophora merlangi and their congeneric species.

Comparable parameters Perdiguero-Alonso et al. 2006 Morsy et al. 2018 Present study
Host Gadus morhua Gadus morhua Merlangius merlangus Saurida undosquamis Acanthopagrus bifasciatus
Location North Sea Celtic Sea Celtic Deep Red Sea, Egypt Arabian Gulf, Saudi Arabia
Body Length 2.24 3.30 9.07±1.98 (4.25–13.10) 6±2 (4–10) 3.67±0.12 (2.97–5.26)
Width 1.18 1.06 3.69±0.77 (2.12–5.43) 1.25±0.23 (0.45–1.39) 0.72±0.01 (0.61–0.95)
Buccal sucker diameter - - - 0.12±0.02 (0.08–0.15) 0.076±0.004 (0.071–0.089)
Pharynx length 0.15 0.08 0.27±0.04 (0.15–0.39) 0.12±0.006 (0.08–0.15) 0.059±0.013 (0.041–0.075)
Muscular bulb diameter 0.077 0.069 0.12±0.02 (0.08–0.15) - 0.049±0.008 (0.039–0.055)
Number of copulatory organ hooks 17 17 17±2 (13–20) 15–19 17
Germarium length 0.53 0.78 1.96±0.43 (1.00–2.83) 0.60±0.01 (0.04–0.80) 0.232±0.034 (0.191–0.270)
Number of testes 223 256 201±31 (167–290) 220±40 (190–250) 218±10 (184–267)
Testicular area length 0.826 0.908 0.670±0.031 (0.177–1.413) - 0.981±0.023 (0.801–1.26)
Haptor length 0.85 1.15 2.68±0.63 (1.35–4.10) - 0.665±0.128 (0.459–0.752)
First clamp length 0.17 0.22 0.35±0.05 (0.22–0.43) - 0.160±0.008 (0.150–0.166)
First clamp width 0.14 0.17 0.28±0.40 (0.18–0.36) 0.39±0.01 (0.28–0.47) 0.142±0.008 (0.133–0.149)
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