Micrographs of the ornamentation and accessory structure within species studied taken by SEM A Depressions (“craters”) in Moina macrocopa Straus, 1820 B Verrucae in Macrothrix mexicanus Ciros-Pérez, Silva-Briano & Elías-Gutiérrez, 1996, see arrow C Striae in Biapertura ossiani Leydig, 1860 D Pores in Dunhevedia crassa; King, 1853 E Faint hexagonal reticulation in Pleuroxus denticulatus Birge, 1879 F “Scales” with depressions in between in Macrotrix rosea Jurine, 1820 G Filamentous membrane in Alona aguascalientensis Sinev & Silva-Briano, 2012, see arrow H Ventral appendices in Daphnia (Ctenodaphnia) exilis Herrick, 1895, see arrow I Spinules on the main posterodorsal spine in Daphnia pulex Leydig, 1860, see arrow.