A função das papilas genital e anal na inseminação em Compsura heterura é discutida com base na descrição de suas morfologias em diferentes estágios do ciclo de vida e por ocasião da cópula e desova. Em machos e fêmeas, as papilas genital e anal estão envolvidas na cópula. Um órgão pré-anal, anterior ao ânus e alongado posteriormente, está presente em machos adultos. Fêmeas possuem aberturas urinária e genital separadas. Durante a cópula, ocorre uma aproximação entre as papilas genital e anal femininas, que se justapõem temporariamente, formando uma câmara fechada onde se abre o oviduto, e que serve possivelmente à captura de esperma. Durante a desova, as bordas laterais da papila genital feminina são projetadas anteriormente, adquirindo um formato tubular para ovoposição.

Palavras-chave:
Compsurini; Cópula; Desova; Dimorfismo sexual; Órgão pré-anal

Autoria

Antônio Queiroz Lezama

Programa de Pós-Graduação em Biologia Animal, Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Agronomia, 91501-970 Porto Alegre, RS, Brazil. (ALQ) anlezama@yahoo.com.br (corresponding author); (LRM) malabarb@ufrgs.br.Universidade Federal do Rio Grande do SulBrazilPorto Alegre, RS, BrazilPrograma de Pós-Graduação em Biologia Animal, Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Agronomia, 91501-970 Porto Alegre, RS, Brazil. (ALQ) anlezama@yahoo.com.br (corresponding author); (LRM) malabarb@ufrgs.br.

https://orcid.org/0000-0001-6659-417X

Luiz R. Malabarba

https://orcid.org/0000-0002-9607-3735

Edited by

Elizete Rizzo

CORRESPONDENCE

Antônio Queiroz Lezama anlezama@yahoo.com.br

AUTHOR’S CONTRIBUTION

Antônio Queiroz Lezama: Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Writing-original draft, Writing-review and editing. Luiz R. Malabarba: Data curation, Formal analysis, Funding acquisition, Methodology, Supervision, Writing-review and editing.

COMPETING INTERESTS

The authors declare no competing interests.

ETHICAL STATEMENT

This study conforms to the principles outlined in the Guide for the care and use of laboratory animals (Garber et al., 2011Garber JC, Barbee RW, Bielitzki JT, Clayton LA, Donovan JC, Kohn DF et al. Guide for the care and use of laboratory animals. Washington DC: The National Academies Press; 2011.) and was approved by the Ethics Committee on Animal Use of the UFRGS.

SCIMAGO INSTITUTIONS RANKINGS

Figuras

Figuras (3)

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FIGURE 1
| SEM photomicrograph of the genital and anal papillae of Compsura heterura males in ventral view (anterior to left). A. Juvenile specimen measuring 15.2 mm SL. B. Juvenile specimen measuring 19.02 mm SL. C. Amplified view of the pre anal organ showed in B. D. Adult male (27.18 mm SL) showing the hood-like shape of the genital papilla. E. Adult male (28.21 mm SL) showing the hypertrophied pre-anal organ. F. Adult male (26.67 mm SL) showing genital papilla immediately after copulation showing the pre anal organ covering the anus. AN = anus; EP = epithelia lateral to the anus; GP = genital papilla; PO = pre anal organ; UO = urogenital opening.

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FIGURE 2
| Histological section of the adult male pre anal organ, in sagittal view, showing its acidophilic granules (26.97 mm SL; aquarium specimen). AN=anus; PO= pre anal organ; arrow = acidophilic granules.

Thumbnail

FIGURE 3
| SEM photomicrographs (A, C, E) and photos under stereomicroscope (B, F) of the genital and anal papillae in ventral view (anterior to left), and (D) histology of the genital and anal papillae of Compsura heterura females. A. Juvenile female measuring 17.6 mm SL. B. Virgin adult female measuring 26.56 mm SL showing the hood-like genital papilla and anal papilla. C. Genital papilla of a specimen measuring 26.56 mm SL, in ventral view, showing the separation between the genital and urinary openings. D. Genital papilla of a specimen measuring 27.24 mm SL showing the separation between the genital and urinary openings. E. Genital papilla of a specimen measuring 27.02 mm SL euthanized immediately after copulation showing the anal and genital papilla close to each other, forming a closed cavity covering the genital opening. F. Genital papilla of a specimen measuring 26.87 mm SL euthanized during spawning. AN = anus; AP = anal papilla; GO = genital opening; GP = genital papilla; OV = ovary; UD = urinary duct; UO = urinary opening.

FIGURE 1 | SEM photomicrograph of the genital and anal papillae of Compsura heterura males in ventral view (anterior to left). A. Juvenile specimen measuring 15.2 mm SL. B. Juvenile specimen measuring 19.02 mm SL. C. Amplified view of the pre anal organ showed in B. D. Adult male (27.18 mm SL) showing the hood-like shape of the genital papilla. E. Adult male (28.21 mm SL) showing the hypertrophied pre-anal organ. F. Adult male (26.67 mm SL) showing genital papilla immediately after copulation showing the pre anal organ covering the anus. AN = anus; EP = epithelia lateral to the anus; GP = genital papilla; PO = pre anal organ; UO = urogenital opening.

FIGURE 2 | Histological section of the adult male pre anal organ, in sagittal view, showing its acidophilic granules (26.97 mm SL; aquarium specimen). AN=anus; PO= pre anal organ; arrow = acidophilic granules.

FIGURE 3 | SEM photomicrographs (A, C, E) and photos under stereomicroscope (B, F) of the genital and anal papillae in ventral view (anterior to left), and (D) histology of the genital and anal papillae of Compsura heterura females. A. Juvenile female measuring 17.6 mm SL. B. Virgin adult female measuring 26.56 mm SL showing the hood-like genital papilla and anal papilla. C. Genital papilla of a specimen measuring 26.56 mm SL, in ventral view, showing the separation between the genital and urinary openings. D. Genital papilla of a specimen measuring 27.24 mm SL showing the separation between the genital and urinary openings. E. Genital papilla of a specimen measuring 27.02 mm SL euthanized immediately after copulation showing the anal and genital papilla close to each other, forming a closed cavity covering the genital opening. F. Genital papilla of a specimen measuring 26.87 mm SL euthanized during spawning. AN = anus; AP = anal papilla; GO = genital opening; GP = genital papilla; OV = ovary; UD = urinary duct; UO = urinary opening.

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Sociedade Brasileira de Ictiologia Neotropical Ichthyology, Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringá., Av. Colombo, 5790, 87020-900, Phone number: +55 44-3011-4632 - Maringá - PR - Brazil
E-mail: neoichth@nupelia.uem.br

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[1] Edited by

Elizete Rizzo