Fig. 4

Comparative SEM of NFM, TFM and PRM. a Two pairs of setae on the sternal plate of NFM (arrows) whereas TFM have three pairs of setae on the sternal plate (not shown). b Female PRM with a keystone-shaped anal plate. c The anal plate is distinct, with female NFM being tear-drop shaped with three anal setae (arrows). d Female NFM has elongated chelicerae with well-developed and distinct, fixed and movable digit, whereas adult female PRM have a smooth “whip-like” celicerae (not shown). Scale-bars: a, c, d, 50 μm; b, 500 μm. Abbreviations: ch, chelicera; fd, fixed digit; md, movable digit; Pa, pedipalp; ao, anal opening; as, anal shield; st, sternal plate; (LI–IV), leg; gs, genitoventral shield