Morphological and molecular studies of <i>Hysterothylacium thalassini</i> third-stage larvae (Ascaridida, Raphidascarididae) in the greater lizardfish <i>Saurida tumbil</i>

Abdel-Gaber, R.; Alojayri, G.; Quraishy, S. Al; Al-Shaebi, E.M.; Mohammed, O.B.

doi:10.1590/1678-4162-13206

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Original Article - Veterinary Medicine • Arq. Bras. Med. Vet. Zootec. 76 (4) • Jul-Aug 2024 • https://doi.org/10.1590/1678-4162-13206 copy

Morphological and molecular studies of Hysterothylacium thalassini third-stage larvae (Ascaridida, Raphidascarididae) in the greater lizardfish Saurida tumbil

[Estudos morfológicos e moleculares das larvas de terceiro estágio de Hysterothylacium thalassini (Ascaridida, Raphidascarididae) no peixe-lagarto Saurida tumbil]

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Hysterothylacium species are perhaps the most abundant and diverse group of marine ascaridoids. Identification of larval stages at specific levels is very problematic. This study describes the occurrence of Hysterothylacium larvae parasitizing the peritoneal cavity and mesenteries of Saurida tumbil purchased from fish markets in Saudi Arabia. Fish were visually inspected for nematodes using micro- and macroscopic examinations. Nematodes were assigned to genus level based on morphology and identified at specific level by sequence analyses of 18S rRNA and COI genes. Morphological examination by light microscopy showed that worms identified as third-stage larvae (L3) belonged to genus Hysterothylacium Ward and Magath, 1917. COI sequences from host confirmed identity of host as S. tumbil as it resulted in identical sequences from S. tumbil in GenBank. Identity of L3 based on 18S rDNA sequences confirmed their identity as H. thalassini and showed high similarity to sequences in GenBank. A unique hitherto sequences of L3 related to COI region have been reported herein. This is the first record of Hysterothylacium L3-stage parasitizing lizardfish in Saudi Arabia. Therefore, this study represents the importance of a combination of morphological and molecular tools for taxonomy and systematics of ascaridoids at specific level and confirming its host identity.

Keywords:
Ascaridoidea; larvae; identification; Saurida species; Saudi Arabia

Reference	Host fish	Body		Location from anterior extremity		Ventricular appendix	Intestinal caecum	Tail length
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	Parupeneus forsskali	4.60	0.16	0.273	0.34	0.59	0.14	0.15
	Rhabdosargus haffara, Parupeneus forsskali	6.54-8.86	0.23-0.27	0.24-0.28	0.34-0.58	0.46-0.63	0.16-0.22	0.14-0.18
	Parupeneus cyclostomus	4.49	0.16	0.22	0.30	0.24	0.13	0.12
AlGabbani et al., 2021	Argyrops spinifer	6.20 (5.32-8.97)	0.48 (0.15-0.64)	0.21 (0.09-0.22)	0.31 (0.11-0.39)	2.28 (2.31-3.34)	0.19 (0.18-0.20)	0.18 (0.16-0.19)
Gelen and Pekmezci 2023GELEN, M.Y.; PEKMEZCI, G.Z. Morphological and molecular characterization of Hysterothylacium larval morphotypes (Nemtoda: Raphidascarididae) infecting edible marine fish in the Black Sea. Parasitol. Res., v.122, p.1863-1872, 2023.	Mullus barbatus	10.0 (10.0-11.0)	0.17 (0.16-0.19)	0.27 (0.26-0.28)	0.37 (0.36-0.39)	0.90 (0.84-0.98)	0.07 (0.06-0.07)	0.12 (0.10-0.16)
	Engraulis encrsicolu, Trachurus trachurus, Mullus barbatus, Merlangius merlangus	11.0 (7.0-12.0)	0.21 (0.20-0.22)	0.30 (0.28-0.34)	0.41 (0.37-0.44)	0.51 (0.41-0.71)	0.55 (0.45-0.80)	0.14 (0.11-0.20)
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	Pagrus pagrus	9.67 (1.78-11.64)	0.26 (0.12-0.40)	0.52 (0.34-0.66)	0.58 (0.22-0.75)	0.78 (0.29-1.02)	0.09 (0.05-0.20)	0.33 (0.21-0.45)
Present study	Saurida tumbil	10.03 (7.11-18.45)	0.62 (0.47-0.75)	0.29 (0.17-0.41)	0.34 (0.19-0.49)	4.18 (2.04-5.67)	0.16 (0.11-0.23)	0.14 (0.11-0.20)

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[1] Corresponding author:
rabdelgaber.c@ksu.edu.sa