Polarised light micrograph of a spine of a sea urchin (Echinus sp.). The test and spines of sea urchins are composed of calcium carbonate. Each spine articulates with a tubercle on the test. The elaborate structure of the spines when seen in cross section has made them a popular subject for microscopists | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Lowry, Steve |
Bildgröße: | 3977 px × 2662 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |