FIGURE 3. Diagrammatic representation of Parachela claw structure and nomenclature. A. Exploded diagram of a parachelan claw to explain component parts. a—accessory spines; b—basal tract; l—lunule (edge may be smooth or dentate); p—primary branch; s—secondary branch. B. Stylised diagram of macrobitid claw (2112). Secondary branch—2; primary branch—1; primary branch—1; secondary branch—2. C. Stylised diagram of a hypsibid claw (2121). Secondary branch—2; primary branch—1; secondary branch—2; primary branch—1. D. Stylised diagram of: i—isohypsibid (basal section and secondary branch at right angles) and h—hypsibid (basal section and secondary branch forming continuous arc) claws. E. Stylised diagram of Eohypsibiidae-type claw—claws are clearly delineated by septa into basal section, secondary branch and primary branch.