Sexual reproductive biology of twelve species of rotifers in the genera: <i>Brachionus</i>, <i>Cephalodella</i>, <i>Collotheca</i>, <i>Epiphanes</i>, <i>Filinia</i>, <i>Lecane,</i> and <i>Trichocerca</i>

<p>We provide descriptions of the sexual reproductive biology of 12 species of rotifers from seven families and seven genera: <i>Brachionus angularis, B. araceliae, B. ibericus, B. quadridentatus</i> (Brachionidae); <i>Cephalodella catellina</i> (Notommatidae)<i>; Collotheca ornata</i> (Collothecidae); <i>Epiphanes brachionus</i> (Epiphanidae), <i>Filinia novaezealandiae</i> (Trochosphaeridae); <i>Lecane nana, L. leontina, L. bulla</i> (Gosse 1851) (Lecanidae); and <i>Trichocerca stylata</i> (Trichocercidae). Data include: (a) video-recordings of 10 of the 12 species (the exceptions are two common species, <i>B. angularis</i> and <i>B. ibericus</i>), (b) scanning electron micrographs of <i>B. araceliae</i>, <i>B. ibericus</i>, <i>C. catellina,</i> and <i>E</i>. <i>brachionus</i> females, (c) light micrographs of <i>C. catellina, C. ornata, F. novaezealandiae</i>, <i>L. bulla</i>, <i>L. leontina, L. nana,</i> and <i>T. stylata</i> diapausing embryos, males, and unfertilized sexual eggs. This study challenges the common perception that mating behavior consists of five steps, and provides: (a) the first documentation of sexual cannibalism in <i>C. catellina</i>, (b) the first description of the sexual reproductive behaviors of <i>C. ornata</i>, <i>L. bulla, L. leontina, L. nana</i>, and <i>T. stylata</i>, (c) the first description of the males of <i>F</i>. <i>novaezealandiae</i>, <i>L. leontina, L. nana,</i> and <i>T. stylata</i>. Moreover, this study includes analyses of morphological and behavioral variation among males of the seven families studied.</p>