A gill arch is a bony support for gills, with each gill consisting of four arches lined with hundreds of thin, flat gill filaments.
El arco branquial es un soporte óseo para las branquias, cada una compuesta por cuatro arcos cubiertos de cientos de filamentos branquiales delgados y planos.
| Front | Define gill arch. |
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| Back | Gill arch - bony support for gills
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