Regionalization in the eye of the grapsid crab Neohelice granulata (=Chasmagnathus granulatus): Variation of resolution and facet diameters
Crabs have panoramic compound eyes, which can show marked regional specializations of visual acuity. These specializations are thought to be related to the particular features of the animal's ecological environment. Modern knowledge on the neuroanatomy and neurophysiology of the crabs' vis...
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2012
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03407594_v198_n3_p173_BerondeAstrada http://hdl.handle.net/20.500.12110/paper_03407594_v198_n3_p173_BerondeAstrada |
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paper:paper_03407594_v198_n3_p173_BerondeAstrada2023-06-08T15:34:26Z Regionalization in the eye of the grapsid crab Neohelice granulata (=Chasmagnathus granulatus): Variation of resolution and facet diameters Beron De Astrada, Martin Medan, Violeta Tomsic, Daniel Behaviour Brachyura Compound eye Visual system Visuotopy animal animal behavior article Brachyura compound eye histology male physiology vision visual field Animals Behavior, Animal Brachyura Compound Eye, Arthropod Male Vision, Ocular Visual Fields Crabs have panoramic compound eyes, which can show marked regional specializations of visual acuity. These specializations are thought to be related to the particular features of the animal's ecological environment. Modern knowledge on the neuroanatomy and neurophysiology of the crabs' visual system mainly derives from studies performed in the grapsid crab Neohelice granulata (=Chasmagnathus granulatus). However, the organization of the visual sampling elements across the eye surface of this animal had not yet been addressed. We analyzed the sampling resolution across the eye of Neohelice by measuring the pseudopupil displacement with a goniometer. In addition, we measured the facet sizes in the different regions of the eye. We found that Neohelice possesses an acute band of high vertical resolution around the eye equator and an increase in horizontal sampling resolution and lenses diameter towards the lateral side of the eye. Therefore, the analysis of the optical apparatus indicates that this crab possesses greater visual acuity around the equator and at the lateral side of the eye. These specializations are compared with those found in different species of crabs and are discussed in connection to the particular ecological features of Neohelice's habitat. © 2011 Springer-Verlag. Fil:Berón de Astrada, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Medan, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tomsic, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03407594_v198_n3_p173_BerondeAstrada http://hdl.handle.net/20.500.12110/paper_03407594_v198_n3_p173_BerondeAstrada |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Behaviour Brachyura Compound eye Visual system Visuotopy animal animal behavior article Brachyura compound eye histology male physiology vision visual field Animals Behavior, Animal Brachyura Compound Eye, Arthropod Male Vision, Ocular Visual Fields |
| spellingShingle |
Behaviour Brachyura Compound eye Visual system Visuotopy animal animal behavior article Brachyura compound eye histology male physiology vision visual field Animals Behavior, Animal Brachyura Compound Eye, Arthropod Male Vision, Ocular Visual Fields Beron De Astrada, Martin Medan, Violeta Tomsic, Daniel Regionalization in the eye of the grapsid crab Neohelice granulata (=Chasmagnathus granulatus): Variation of resolution and facet diameters |
| topic_facet |
Behaviour Brachyura Compound eye Visual system Visuotopy animal animal behavior article Brachyura compound eye histology male physiology vision visual field Animals Behavior, Animal Brachyura Compound Eye, Arthropod Male Vision, Ocular Visual Fields |
| description |
Crabs have panoramic compound eyes, which can show marked regional specializations of visual acuity. These specializations are thought to be related to the particular features of the animal's ecological environment. Modern knowledge on the neuroanatomy and neurophysiology of the crabs' visual system mainly derives from studies performed in the grapsid crab Neohelice granulata (=Chasmagnathus granulatus). However, the organization of the visual sampling elements across the eye surface of this animal had not yet been addressed. We analyzed the sampling resolution across the eye of Neohelice by measuring the pseudopupil displacement with a goniometer. In addition, we measured the facet sizes in the different regions of the eye. We found that Neohelice possesses an acute band of high vertical resolution around the eye equator and an increase in horizontal sampling resolution and lenses diameter towards the lateral side of the eye. Therefore, the analysis of the optical apparatus indicates that this crab possesses greater visual acuity around the equator and at the lateral side of the eye. These specializations are compared with those found in different species of crabs and are discussed in connection to the particular ecological features of Neohelice's habitat. © 2011 Springer-Verlag. |
| author |
Beron De Astrada, Martin Medan, Violeta Tomsic, Daniel |
| author_facet |
Beron De Astrada, Martin Medan, Violeta Tomsic, Daniel |
| author_sort |
Beron De Astrada, Martin |
| title |
Regionalization in the eye of the grapsid crab Neohelice granulata (=Chasmagnathus granulatus): Variation of resolution and facet diameters |
| title_short |
Regionalization in the eye of the grapsid crab Neohelice granulata (=Chasmagnathus granulatus): Variation of resolution and facet diameters |
| title_full |
Regionalization in the eye of the grapsid crab Neohelice granulata (=Chasmagnathus granulatus): Variation of resolution and facet diameters |
| title_fullStr |
Regionalization in the eye of the grapsid crab Neohelice granulata (=Chasmagnathus granulatus): Variation of resolution and facet diameters |
| title_full_unstemmed |
Regionalization in the eye of the grapsid crab Neohelice granulata (=Chasmagnathus granulatus): Variation of resolution and facet diameters |
| title_sort |
regionalization in the eye of the grapsid crab neohelice granulata (=chasmagnathus granulatus): variation of resolution and facet diameters |
| publishDate |
2012 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03407594_v198_n3_p173_BerondeAstrada http://hdl.handle.net/20.500.12110/paper_03407594_v198_n3_p173_BerondeAstrada |
| work_keys_str_mv |
AT berondeastradamartin regionalizationintheeyeofthegrapsidcrabneohelicegranulatachasmagnathusgranulatusvariationofresolutionandfacetdiameters AT medanvioleta regionalizationintheeyeofthegrapsidcrabneohelicegranulatachasmagnathusgranulatusvariationofresolutionandfacetdiameters AT tomsicdaniel regionalizationintheeyeofthegrapsidcrabneohelicegranulatachasmagnathusgranulatusvariationofresolutionandfacetdiameters |
| _version_ |
1768543423437996032 |