Microscopic aspects of electrosensory system on the partially euryhaline lesser guitarfish



Document title: Microscopic aspects of electrosensory system on the partially euryhaline lesser guitarfish
Journal: Anais da Academia Brasileira de Ciencias
Database: PERIÓDICA
System number: 000420576
ISSN: 0001-3765
Authors: 1
3
4
2
2
Institutions: 1Universidade de Sao Paulo, Instituto de Biociencias, Sao Paulo. Brasil
2Universidade de Sao Paulo, Faculdade de Medicina Veterinaria e Zootecnia, Sao Paulo. Brasil
3Universidade Federal do Parana, Centro Politecnico, Curitiba, Parana. Brasil
4Secretaria de Agricultura e Abastecimento do Estado de Sao Paulo, Agencia Paulista de Tecnologia dos Agronegocios, Santos, Sao Paulo. Brasil
Year:
Season: Mar
Volumen: 90
Number: 1
Pages: 31-40
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Analítico, descriptivo
English abstract The electrosensory system on elasmobranchs consists of subcutaneous electroreceptor organs known as ampullae of Lorenzini. The present study investigated the ampullae of Lorenzini morphology of the lesser guitarfish Zapteryx brevirostris, using light microscopy and scanning electron microscopy. The pore number found in the ventral skin surface is much higher than that found in the dorsal portion, characteristic of species that inhabit the euphotic zone. Under light microscopy it was possible to observe that the wall canal consists of a single layer of squamous epithelial cells. The canal features distal expansion, where the ampullae are located with up to six alveoli. The sensory epithelium of ampullae is composed by cubic cells, with oval nucleus, restricted to the interior of the alveoli. With analysis the clusters under scanning electron microscopy, it was possible to observe the structure and the random arrangement of individual ampullae, canals and nerves. The distribution of dorsal and ventral pores and ampullae in Z. brevirostris resembled those of the same family. The number of alveoli per ampullae was similar to that found in euryhaline elasmobranchs species, suggesting that the morphological organization in Z. brevirostris is linked to its possible evolutionary transitory position among batoids
Disciplines: Biología
Keyword: Peces,
Anatomía e histología,
Peces marinos,
Organos electrorreceptores,
Ampulas de Lorenzini,
Microscopía electrónica de barrido,
Elasmobranchii
Keyword: Fish,
Anatomy and histology,
Marine fish,
Electroreceptors organs,
Lorenzini ampullae,
Scanning electron microscopy,
Elasmobranchii
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