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A new reconstruction of the 375-million-year-old fossil fish Tiktaalik -- a close relative of limbed vertebrates -- used micro-CT to reveal bones still embedded in matrix. The reconstruction shows ...

1. Introduction to histotechniques and fish gross anatomy -- 2. Tissues of fishes -- 3. The skeleton of fish -- 4. Skin and associated sense structures -- 5. The respiratory system -- 6.

When an Australian scientist uncovered an ancient-looking placoderm skull in the 1960s, he thought he'd cracked the code on an evolutionary mystery. This so-called 'platypus fish,' scientists had ...