Figure 3. Leptodiaptomus nudus (Marsh). Male. Left and right 1st antennae, and spines on right 1st antenna, with features identified. (a) right 1st antenna, segments 10-14, showing spines on segments 10, 11 and 13, setae not included; (b) left 1st antenna, segments 1-25; (c) right 1st antenna, segments 1-25. (a-c) (redrawn after Shih & Maclellan 1977).