New morphological data on <i>Cucullanus pinnai pinnai</i> (Nematoda) parasitizing <i>Pimelodus maculatus</i> (Pimelodidae) in southeastern Brazil

Vieira, Vivian Suane de Freitas; Vieira, Fabiano Matos; Luque, José Luis

doi:10.1590/S1984-29612015028

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Original Article • Rev. Bras. Parasitol. Vet. 24 (2) • Apr-Jun 2015 • https://doi.org/10.1590/S1984-29612015028 copy

New morphological data on Cucullanus pinnai pinnai (Nematoda) parasitizing Pimelodus maculatus (Pimelodidae) in southeastern Brazil

Novos dados morfológicos de Cucullanus pinnai pinnai (Nematoda) parasito de Pimelodus maculatus (Pimelodidae) do Sudeste do Brasil

Authorship SCIMAGO INSTITUTIONS RANKINGS

This paper describes the morphology of Cucullanus pinnai pinnai parasitizing Pimelodus maculatus in the Guandu River, Brazil, based on differential interference contrast (DIC) microscopy and scanning electron microscopy (SEM), providing new morphological data about this species of parasite. Nematodes were collected between May and October 2012 from specimens of Pimelodus maculatus in the Guandu River (22°48’2”S, 43°37’35”W), in the state of Rio de Janeiro, Brazil. Some characteristics of specimens of Cucullanus in this study fall within the range of morphological variations of previously studied C. pinnai pinnai. Most of the specimens studied here had excretory pore and deirids located at the posterior end of the oesophagus, a feature not recorded in previous studies of this species. In addition, the size of the gubernaculum was larger than the other specimens previously studied. The SEM and DIC analyses of C. pinnai revealed several morphological details of the cephalic region and the tail papillae. With regard to the polymorphism of C. pinnai, morphological and genetic studies of this cucullanid nematode are needed, involving large numbers of host species and a wide geographical distribution.

Cucullanus pinnai pinnai ; fish parasite; Pimelodidae; morphological data; Guandu River; Brazil

		Current Study		Travassos et al. (1928) Travassos L, Artigas P, Pereira C. Fauna helmintológica dos peixes de água doce do Brasil. Arq Instit Biol 1928; 1(1): 5-68.		Hamann (1985) Hamann MI. Presencia de Travassos, Artigas y Pereira (1928) en peces del río Paraná Medio, Provincia de Corrientes, Republica Argentina (Nematoda, Cucullanidae). Cucullanus pinnaiHist Nat 1985; 5(17): 147-148.								Moravec et al. (1993) Moravec F, Kohn A, Fernandes BMM. Nematode Parasites of fishes of the Paraná River, Brazil. Part. 2. Seuratoidea, Ascaridoidea, Habronematoidea and Acuarioidea. Folia Parasitol (Praha) 1993; 40(2): 115-134.				Petter (1995) Petter AJ. n. sp., parasite de et notes sur les Cucullanidae du Paraguay. Dichelyne moraveci Pseudoplatystoma fasciatumRev Suisse Zool 1995; 102(3): 769-778.			Moravec et al. (1997) Moravec F, Kohn A, Fernandes BMM. New observations on seuratoid nematodes parasitic in fishes of the Paraná River, Brasil. Folia Parasitol (Praha) 1997; 44(3): 209-223. PMid:9332979.
Host species		*Pimelodus maculatus*		Synodontis clarias (= Pimelodus clarias) (type host)		*Luciopimelodus pati*		*Pseudoplatystoma corruscans*		*Pimelodus albicans*		*Pimelodus clarias*		*Pimelodus ornatus*		*Ageneiosus militaris*		*Pseudoplatystoma corruscans*	*Megalonema platanun*		*Pimelodus maculatus*		Loricaria sp.
Number of nematodes measured	8		1		Unspecified		Unspecified		Unspecified		Unspecified		2		1		12			6		3		1
Total body length	6,651-10,526		8,500		6,000-11,000		9,000-11,000		6,000-8,000		4,000-8,000		5,070		8,000		3,000-4,000			2,450-5,600		6,010-11,880		4,200
Body width	209-324		300		160-350		180-230		270-300		160-300		258-272		204		-			-		326-435		177
Oesophagus length	448-896		680-850		510-800		600-1,000		500-720		600-800		789		789		390-600			350-725		680-979		544
Nerve ring	231-402		-		-		-		-		-		313		299		180-250			140-250		286-313		204
Excretory pore	518-896		-		-		-		-		-		558		-		-			-		544		408
Deirids	225-975		-		-		-		-		-		639		585		350-450			320-575		680-966		405
Spicules	400-713		570		430-610		420-550		420-550		420-530		381-681		345		250-370			115-470		408-585		598
Gubernaculum	136-396		-		-		-		-		-		63-69		63		-			-		60-75		63
Tail	195-291		200		150-260		200-250		150-180		150-200		114-192		190		-			-		190-286		109
Locality	Guandu River, Seropédica, Rio de Janeiro (Brazil)		Mogi-Guaçu River, Pirassununga (type locality), São Paulo (Brazil)		Paraná River, Corrientes (Argentina)								Paraná River, Guaíra, Paraná (Brazil)				Paraná River, Province of Itapúa (Paraguay)					Reservoir of Itaipu, Guaira, Paraná (Brazil)		Reservoir of Itaipu, Guaira, Paraná (Brazil)

	Current Study	Travassos et al. (1928) Travassos L, Artigas P, Pereira C. Fauna helmintológica dos peixes de água doce do Brasil. Arq Instit Biol 1928; 1(1): 5-68.	Hamann (1985) Hamann MI. Presencia de Travassos, Artigas y Pereira (1928) en peces del río Paraná Medio, Provincia de Corrientes, Republica Argentina (Nematoda, Cucullanidae). Cucullanus pinnaiHist Nat 1985; 5(17): 147-148.				Moravec et al. (1993) Moravec F, Kohn A, Fernandes BMM. Nematode Parasites of fishes of the Paraná River, Brazil. Part. 2. Seuratoidea, Ascaridoidea, Habronematoidea and Acuarioidea. Folia Parasitol (Praha) 1993; 40(2): 115-134.	Moravec et al. (1997) Moravec F, Kohn A, Fernandes BMM. New observations on seuratoid nematodes parasitic in fishes of the Paraná River, Brasil. Folia Parasitol (Praha) 1997; 44(3): 209-223. PMid:9332979.
Host species	*Pimelodus maculatus*	Synodontis clarias (= Pimelodus clarias) (type host)	*Luciopimelodus pati*	*Pseudoplatystoma corruscans*	*Pimelodus albicans*	*Pimelodus clarias*	*Pimelodus ornatus*	*Pimelodella gracilis*	*Pimelodus maculatus*	*Paulicea luetkeni*	Loricaria sp.
Number of nematodes measured	9	Unspecified	Unspecified	Unspecified	Unspecified	Unspecified	1	1	3	2	1
Total body length	6,833-12,586	5,900-9,800	6,000-13,000	9,000-17,000	8,000-16,500	5,000-7,000	9,070	7,630	6,460-12,310	5,300-5,940	5,070
Body width	153-424	280-300	250-400	300-500	410-500	320-410	367	299	272-394	231-272	245
Oesophagus length	682-970	680-850	600-1,500	600-1,200	600-1,100	600-850	898	857	694-952	598-707	612
Nerve ring	258-462	-	-	-	-	-	313	326	258-354	122-136	231
Excretory pore	295-1,037	-	-	-	-	-	680	653	476-925	517-639	449
Deirids	337-998	-	-	-	-	-	762	666	517-911	530-585	462
Vulva to posterior end	1805- 6,956	2,100-3,900	2,000-6,000	3,000-5,500	2,000-4,000	2,000-3,000	3,750	3,350	2,830-4,990	2,420-2,590	2,680
Tail	170-390	240-450	220-400	220-450	240-400	240-400	258	231	286-381	204-272	204
Eggs (length × width)	61-69 × 30-35	45-54 × 27-29	40-75 × 31-50	40-75 × 31-50	40-75 × 31-50	40-75 × 31-50	42-51 × 30-33	-	45-63 × 30-42	-	54-60 × 39
Locality	Guandu River, Seropédica, Rio de Janeiro (Brazil)	Mogi-Guaçu River, Pirassununga (type locality), São Paulo (Brazil)	Paraná River, Corrientes (Argentina)				Paraná River, Guaíra, Paraná (Brazil)	Paraná River, Guaíra, Paraná (Brazil)	Reservoir of Itaipu, Guaira, Paraná (Brazil)	Paraná River, Foz do Iguaçu, Paraná (Brazil)	Reservoir of Itaipu, Guaira, Paraná (Brazil)

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E-mail: cbpv_rbpv.fcav@unesp.br

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[1] *Corresponding author: José Luis Luque. Curso de Pós-Graduação em Ciências Veterinárias, Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro – UFRRJ, CP 74540, CEP 23851-970, Seropédica, RJ, Brasil. e-mail: luqueufrrj@gmail.com