n.1.(Zool.) A free-swimming, dimorphic, sexual form of certain species of Nereis.
References in periodicals archive ?
Width was measured at setiger 5; anterior (setiger 10), median (setiger 30), and posterior (atokous, setiger 84; heteronereis, setiger 57) parapodia were dissected.
Material examined: Mexico, Mexican Caribbean toast, Bahia Chetumal, 24 September 1999, eight syntypes: six atokous and two heteronereis.
Heteronereis were found during April, May, June, September and October.
Even in heteronereis, these species differ as shown in table 3.