Histology of juvenile skin of <i>Lepidosiren paradoxa</i> Fitzinger, 1837 (Sarcopterygii, Dipnoi)

ROMANO, LUIS ALBERTO; LÓPEZ, ANDREA I.H.; BUITRAGO, JUAN RAFAEL; PEDROSA, VIRGÍNIA F.

doi:10.1590/0001-3765201920190822

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Agrarian Sciences • An. Acad. Bras. Ciênc. 91 (04) • 2019 • https://doi.org/10.1590/0001-3765201920190822 linkcopy

Histology of juvenile skin of Lepidosiren paradoxa Fitzinger, 1837 (Sarcopterygii, Dipnoi)

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Abstract: The skin of three juvenile Lepidosiren paradoxa specimens was examined. The epidermis was composed of a polystratified epithelium resting on a basement membrane, including mucus-secreting cells, and a cuticle of mucopolysaccharides on the surface. Two types of skin receptors, electroreceptors and mechanoreceptors, were found; the first type was located in the dermoepidermal junction, and the second type was completely intraepiderma. The skin structure of these fish, suggests the possibility of the skin participating in the breath.

Key words
electroreceptors; lungfish; mechanoreceptors; Paraná River basin; pirambóia

Authorship

person LUIS ALBERTO ROMANO

schoolInstitute of the Oceanography, University Federal of the Rio Grande, Laboratory of the de Immunology and Pathology of the Aquatic Organisms, Rua do Hotel, 2, Cassino, 96210-030 Rio Grande, RS, Brazil University Federal of the Rio GrandeBrazilRio Grande, RS, BrazilInstitute of the Oceanography, University Federal of the Rio Grande, Laboratory of the de Immunology and Pathology of the Aquatic Organisms, Rua do Hotel, 2, Cassino, 96210-030 Rio Grande, RS, Brazil

0000-0003-3144-3579

person ANDREA I.H. LÓPEZ

person JUAN RAFAEL BUITRAGO

schoolUniversity Federal of the Rio Grande, Laboratory of the Biochemistry Functional of Aquatic Organisms, Rua do Hotel, 2, Cassino, 96210-030 Rio Grande, RS, Brazil University Federal of the Rio GrandeBrazilRio Grande, RS, BrazilUniversity Federal of the Rio Grande, Laboratory of the Biochemistry Functional of Aquatic Organisms, Rua do Hotel, 2, Cassino, 96210-030 Rio Grande, RS, Brazil

person VIRGÍNIA F. PEDROSA

Correspondence to: Luis Alberto Romano E-mail:
luisalbertoromano0@gmail.com ORCid: https://orcid.org/0000-0003-3144-3579

AUTHOR CONTRIBUTIONS

Luis Alberto Romano in the animal acquisition, necropsy and slide analysis. Virgínia Fonseca Pedrosa in the histological processing, necropsy and follow-up analysis. Andrea Idelette Hernández López and Juan Rafael Buitrago in the histological processing and slide staining.

SCIMAGO INSTITUTIONS RANKINGS

Institute of the Oceanography, University Federal of the Rio Grande, Laboratory of the de Immunology and Pathology of the Aquatic Organisms, Rua do Hotel, 2, Cassino, 96210-030 Rio Grande, RS, Brazil University Federal of the Rio GrandeBrazilRio Grande, RS, BrazilInstitute of the Oceanography, University Federal of the Rio Grande, Laboratory of the de Immunology and Pathology of the Aquatic Organisms, Rua do Hotel, 2, Cassino, 96210-030 Rio Grande, RS, Brazil

University Federal of the Rio Grande, Laboratory of the Biochemistry Functional of Aquatic Organisms, Rua do Hotel, 2, Cassino, 96210-030 Rio Grande, RS, Brazil University Federal of the Rio GrandeBrazilRio Grande, RS, BrazilUniversity Federal of the Rio Grande, Laboratory of the Biochemistry Functional of Aquatic Organisms, Rua do Hotel, 2, Cassino, 96210-030 Rio Grande, RS, Brazil

Figures

Figures (7)

Thumbnail

Figure 1 Skin of dorsolateral region of L. paradoxa with its differentiated skin layers. A tubule of an electroreceptor is visible in the dermoepidermal junction (e). H-E. Bar: 200 μm.

Thumbnail

Figure 2 Skin of dorsocephalic region of L. paradoxa. Epidermal basal cells (arrow) with an underlying basement membrane (BM arrow) and mucus-secreting (MC) cells. A mechanoreceptor (MR) is visible at the external end of the electroreceptor (ER). The stratum spongiosum and compactum (SE-SC) of the dermis with melanophores (M) are also visible. H-E. Bar: 100 μm.

Thumbnail

Figure 3 Skin of dorsocephalic region of L. paradoxa. Epidermis with abundant mucus-secreting (MC) cells. The mucus is released at the surface, forming the cuticle (C). Several mitotic (Mit) cells are visible. In the dermis, melanophores (M) and capillaries (CA) are visible. H-E. Bar: 50 μm. Insert: mucus-secreting (MC) cells releasing mucus to the outside (short arrow), forming the cuticle (C). There is a tubule of an electroreceptor (long arrow), and mitosis (Mit) can be observed. H-E. Bar: 20 µm.

Thumbnail

Figure 4 Skin of dorsal region of L. paradoxa. Epidermis with PAS-positive mucus-secreting (MC) cells. One of these cells is releasing the mucus at the surface (arrow), contributing to the formation of the cuticle (C). Melanina (ML). PAS. Bar: 20 μm.

Thumbnail

Figure 5 Skin of abdominal region. of L. paradoxa Epidermis with marked cellular activity. Melanin can be observed in the epidermis (arrow) at the surface of an electroreceptor (ER). In the dermis, melanophores with “dendritic” extensions (M) can be observed. Cajal gold sublimate. Bar: 50 μm.

Thumbnail

Figure 6 Skin of dorsocephalic region of L. paradoxa. A mechanoreceptor that occupies the entire thickness of the epidermis. The basal part rests on the basal membrane (MB). The neuroepithelial central cell (NE) is surrounded by support cells (short arrows) and the basal cells of the Malpighian stratum (BC), and the neuropil reaches the surface (long arrow) through the cuticle (C). PAS. Bar: 20 μm.

Thumbnail

Figure 7 Skin of dorsal region of L. paradoxa. At the dermoepidermal border, a tubule of an electroreceptor with a double layer of cuboidal cells (e) is visible; in the epidermis, mucus-secreting (MC) cells are visible, along with the duct of an electroreceptor (ED). Kuhn blue. Bar: 100 μm.

imageFigure 1 Skin of dorsolateral region of L. paradoxa with its differentiated skin layers. A tubule of an electroreceptor is visible in the dermoepidermal junction (e). H-E. Bar: 200 μm. open_in_new

imageFigure 2 Skin of dorsocephalic region of L. paradoxa. Epidermal basal cells (arrow) with an underlying basement membrane (BM arrow) and mucus-secreting (MC) cells. A mechanoreceptor (MR) is visible at the external end of the electroreceptor (ER). The stratum spongiosum and compactum (SE-SC) of the dermis with melanophores (M) are also visible. H-E. Bar: 100 μm. open_in_new

imageFigure 3 Skin of dorsocephalic region of L. paradoxa. Epidermis with abundant mucus-secreting (MC) cells. The mucus is released at the surface, forming the cuticle (C). Several mitotic (Mit) cells are visible. In the dermis, melanophores (M) and capillaries (CA) are visible. H-E. Bar: 50 μm. Insert: mucus-secreting (MC) cells releasing mucus to the outside (short arrow), forming the cuticle (C). There is a tubule of an electroreceptor (long arrow), and mitosis (Mit) can be observed. H-E. Bar: 20 µm. open_in_new

imageFigure 4 Skin of dorsal region of L. paradoxa. Epidermis with PAS-positive mucus-secreting (MC) cells. One of these cells is releasing the mucus at the surface (arrow), contributing to the formation of the cuticle (C). Melanina (ML). PAS. Bar: 20 μm. open_in_new

imageFigure 5 Skin of abdominal region. of L. paradoxa Epidermis with marked cellular activity. Melanin can be observed in the epidermis (arrow) at the surface of an electroreceptor (ER). In the dermis, melanophores with “dendritic” extensions (M) can be observed. Cajal gold sublimate. Bar: 50 μm. open_in_new

imageFigure 6 Skin of dorsocephalic region of L. paradoxa. A mechanoreceptor that occupies the entire thickness of the epidermis. The basal part rests on the basal membrane (MB). The neuroepithelial central cell (NE) is surrounded by support cells (short arrows) and the basal cells of the Malpighian stratum (BC), and the neuropil reaches the surface (long arrow) through the cuticle (C). PAS. Bar: 20 μm. open_in_new

imageFigure 7 Skin of dorsal region of L. paradoxa. At the dermoepidermal border, a tubule of an electroreceptor with a double layer of cuboidal cells (e) is visible; in the epidermis, mucus-secreting (MC) cells are visible, along with the duct of an electroreceptor (ED). Kuhn blue. Bar: 100 μm. open_in_new

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