FIGURES 23–28 in Ancyronyx reticulatus and A. pulcherrimus, two new riffle beetle species from Borneo, and discussion about elmid plastron structures (Coleoptera: Elmidae)

FIGURES 23–28. Ancyronyx reticulatus, female: 23) head, pronotum and fore leg with secretions/encrustations on coxa, femur, anterolateral portion of pronotum and near base of mandible, lateral view; 24) enlarged view of area indicated on previous figure showing dense plastron microstructures in cracks of encrustations/secretions (black arrows); 25) base of hind leg, ventrite 1 and part of epipleuron and elytron, lateral view; 26) enlarged view of area indicated on previous figure showing presumed plastron structures, El: elytron, EP: epipleuron, V1: anterolateral portion of ventrite 1; 27) enlarged surface showing dense cuticular microstructures and shiny granules with setae; 28) cuticular microstructures on anterolateral portion of ventrite 2.