The Fine Structures of Hook Barbules and Bow Barbules (image) Chinese Academy of Sciences Headquarters Share Print E-Mail Caption (A and B) The structure of a single barb from the dorsal view (A) and ventral view (B). Side branches on both sides of the barbs exhibit different structures called hook barbules and bow barbules. (C and D) A hook barbule contains approximately four pendulous, backward-facing hooklets in the middle. (E and F) The bow barbule, with a sharply curved margin, contains approximately four toothlike spine structures, called dorsal spines, with a scalene triangle shape at the distal end. (G and H) The hooklets and the curved triangle dorsal spines match in size and shape. (Scale bars: A and B, 500 μm; C and E, 50 μm; D and F, 20 μm; G and H, 5 μm.) Credit TIPC Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.