Choledocystus elegans (Digenea: Plagiorchiidae) of Leptodactylus paraensis (Amphibia: Leptodactylidae) from the Brazilian Amazon

The trematodes are parasites of the several vertebrates including amphibians, however the knowledge about of the taxonomy these parasites is still confuse. The trematode Choledocystus elegans was found in the small intestine of the Leptodactylus paraensis in eastern Amazon and presents the following characteristics: several pointed tegumentary spines, papillae on the outer and inner edges of the oral and ventral suckers, a round, well-developed cirrus sac, a well-developed cirrus, oblique testicles, a ovary right side, uterine loops extending between the testicles, follicular vitellaria distributed throughout the body, starting at the genital pore region and caeca close the end of the body. For the first time, this study identified C. elegans parasitizing L. paraensis and describes morphological aspects never characterized using light and scanning electron microscopy.

Keywords:
Leptodactylus paraensis; Trematode; Choledocystus elegans; Amazon

Authorship

Tássia Fernanda Furo Gomes ^**Corresponding author: Tássia Fernanda Furo Gomes. Laboratório de Biologia Celular e Helmintologia “Profa. Dra. Reinalda Marisa Lanfredi”, Instituto de Ciências Biológicas, Universidade Federal do Pará – UFPA, Av. Augusto Corrêa, s/n, CEP 66075-110, Belém, PA, Brasil. e-mail: tassiagomes@ufpa.br

Laboratório de Biologia Celular e Helmintologia “Profa. Dra. Reinalda Marisa Lanfredi, Instituto de Ciências Biológicas, Universidade Federal do Pará – UFPA, Belém, PA, BrasilUniversidade Federal do ParáBrasilBelém, PA, BrasilLaboratório de Biologia Celular e Helmintologia “Profa. Dra. Reinalda Marisa Lanfredi, Instituto de Ciências Biológicas, Universidade Federal do Pará – UFPA, Belém, PA, Brasil

Francisco Tiago de Vasconcelos Melo

Elane Guerreiro Giese

Laboratório de Histologia e Embriologia Animal, Instituto de Saúde e Produção Animal, Universidade Federal Rural da Amazônia – UFRA, Belém, PA, BrasilUniversidade Federal Rural da AmazôniaBrasilBelém, PA, BrasilLaboratório de Histologia e Embriologia Animal, Instituto de Saúde e Produção Animal, Universidade Federal Rural da Amazônia – UFRA, Belém, PA, Brasil

Adriano Penha Furtado

Jeannie Nascimento dos Santos

*Corresponding author: Tássia Fernanda Furo Gomes. Laboratório de Biologia Celular e Helmintologia “Profa. Dra. Reinalda Marisa Lanfredi”, Instituto de Ciências Biológicas, Universidade Federal do Pará – UFPA, Av. Augusto Corrêa, s/n, CEP 66075-110, Belém, PA, Brasil. e-mail: tassiagomes@ufpa.br

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Figures

Figures (3)

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Figure 1
Line drawings obtained from light microscopy of Choledocystus elegans: (a) general view of the whole worm. Bar = 200 μm; (b, c) Details of the oral sucker and ventral sucker. Bar = 100 μm; (d) Cirrus, genital pore aperture, cirrus sac and metraterm. Bar = 100 μm. (e) Eggs. Bar = 30 μm.

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Figure 2
Scanning electron micrographs of Choledocystus elegans: (a) General view of the trematode ventral surface. Oral sucker (OS), everted cirrus (Ci), lightly concave ventral sucker. (VS) and excretory pore (EP). Bar = 100 μm; (b) Oral sucker, showing the apical elevation of the tegument (*) at the anterior border of the sucker and the internal distribution of papillae: two groups of three adjacent papillae (keys) and two lateral (arrowhead); in the tegument below oral sucker, are observed six papillae divided into two groups of three (arrows). Bar = 20 μm; (c) Details of the oral sucker, showing six pairs of small rounded (dotted line). Bar = 20 μm; (d) Detail of the ventral sucker outlined by papillae distributed around the perimeter of the opening (arrows), interspersed with a large number of spines (arrowhead). Bar = 20 μm; (e) In the inner region of the ventral sucker, two pairs of domed papillae were observed (arrows). Bar = 10 μm; (f, g) Detail of the terminal excretory pore (EP) showing its spherical aperture, lack of spines or papillae and the presence of little pleats. Bar = 20 μm and 4 μm, respectively.

Thumbnail

Figure 3
Scanning electron micrographs of Choledocystus elegans: (a) Detail of the ventrolateral region of the first-third of the body, showing numerous spines (S). Bar = 10 μm; (b) Detail of tegumentary showing showing the cuneiform shape of spines (S) base and thin, delicate tip. Bar = 4 μm; (c, d) Detail of the genital pore (GP), showing the presence of the anterior extremity of the cirrus (Ci) and spermatozoids (S). Bar = 20 μm; (e, f) Eggs (E) located at the opening of the genital pore next to the cirrus (Ci) and a small elevation (arrow) outlining the perimeter of the operculum. Bar = 10 μm and 4 μm, respectively.

Figure 1 Line drawings obtained from light microscopy of Choledocystus elegans: (a) general view of the whole worm. Bar = 200 μm; (b, c) Details of the oral sucker and ventral sucker. Bar = 100 μm; (d) Cirrus, genital pore aperture, cirrus sac and metraterm. Bar = 100 μm. (e) Eggs. Bar = 30 μm.

Figure 2 Scanning electron micrographs of Choledocystus elegans: (a) General view of the trematode ventral surface. Oral sucker (OS), everted cirrus (Ci), lightly concave ventral sucker. (VS) and excretory pore (EP). Bar = 100 μm; (b) Oral sucker, showing the apical elevation of the tegument (*) at the anterior border of the sucker and the internal distribution of papillae: two groups of three adjacent papillae (keys) and two lateral (arrowhead); in the tegument below oral sucker, are observed six papillae divided into two groups of three (arrows). Bar = 20 μm; (c) Details of the oral sucker, showing six pairs of small rounded (dotted line). Bar = 20 μm; (d) Detail of the ventral sucker outlined by papillae distributed around the perimeter of the opening (arrows), interspersed with a large number of spines (arrowhead). Bar = 20 μm; (e) In the inner region of the ventral sucker, two pairs of domed papillae were observed (arrows). Bar = 10 μm; (f, g) Detail of the terminal excretory pore (EP) showing its spherical aperture, lack of spines or papillae and the presence of little pleats. Bar = 20 μm and 4 μm, respectively.

Figure 3 Scanning electron micrographs of Choledocystus elegans: (a) Detail of the ventrolateral region of the first-third of the body, showing numerous spines (S). Bar = 10 μm; (b) Detail of tegumentary showing showing the cuneiform shape of spines (S) base and thin, delicate tip. Bar = 4 μm; (c, d) Detail of the genital pore (GP), showing the presence of the anterior extremity of the cirrus (Ci) and spermatozoids (S). Bar = 20 μm; (e, f) Eggs (E) located at the opening of the genital pore next to the cirrus (Ci) and a small elevation (arrow) outlining the perimeter of the operculum. Bar = 10 μm and 4 μm, respectively.

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Colégio Brasileiro de Parasitologia Veterinária FCAV/UNESP - Departamento de Patologia Veterinária, Via de acesso Prof. Paulo Donato Castellane s/n, Zona Rural, , 14884-900 Jaboticabal - SP, Brasil, Fone: (16) 3209-7100 RAMAL 7934 - Jaboticabal - SP - Brazil
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Choledocystus elegans (Digenea: Plagiorchiidae) of Leptodactylus paraensis (Amphibia: Leptodactylidae) from the Brazilian Amazon

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[1] *Corresponding author: Tássia Fernanda Furo Gomes. Laboratório de Biologia Celular e Helmintologia “Profa. Dra. Reinalda Marisa Lanfredi”, Instituto de Ciências Biológicas, Universidade Federal do Pará – UFPA, Av. Augusto Corrêa, s/n, CEP 66075-110, Belém, PA, Brasil. e-mail: tassiagomes@ufpa.br