60.2 MB (60.0 MB compressed)
3744 x 5616 pixels
31.8 x 47.5 cm ⏐ 12.5 x 18.7 in (300dpi)
DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Lamprey gill. Light micrograph of a transverse section through the gill region of a lamprey (Petromyzon marinus), a parasitic fish. The spinal area is at upper centre. The lamprey has seven holes each side of the pharynx (centre). Two opposite holes are seen in this section. Each hole passes water into the gill pouches and over the gills (not supported by gill rays) on one side, then across the pharynx to the other side, over the gills in the gill pouches and out through the opposite holes. The gills have feather-like secondary lamellae to aid the extraction of oxygen from the water into the bloodstream. Several large blood vessels are present across centre between the pharynx and the spinal cord. Magnification: x36 when printed at 10 centimetres high.
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