Aonides Claparede , 1864

Abe, Hirokazu & Sato-Okoshi, Waka, 2021, Molecular identification and larval morphology of spionid polychaetes (Annelida, Spionidae) from northeastern Japan, ZooKeys 1015, pp. 1-86 : 1

Genus Aonides Claparede, 1864

Larval diagnosis.

The overall shape slender. Prostomium rounded or rectangular anteriorly. The lateral parts of the peristomium more or less demarcated from prostomium. Two pairs of red eyes present. Melanophore absent, some brown or dark pigmentation may be present in pharynx and pygidium. Larval chaetae coarsely or slightly serrated. Larval chaetae in first chaetiger very long, extend beyond pygidium in late trochophore and early nectochaete stages. Nototrochs develop in late larval stages. Gastrotrochs occur in all chaetigers from chaetiger II onwards. Two pairs of pygidial cirri develop in late larval stage. The body of early larvae covered by egg envelope, yellowish opaque appearance with abundant yolk. Two parallel rows of encircling vesicles of egg envelope present in pretrochophore and trochophore stages. Holopelagic lecithotrophic development unique among spionids ( Hannerz 1956; Blake and Arnofsky 1999, as Dispio uncinata Hartman, 1951: see Radashevsky et al. 2011; Blake 2006, as D. uncinata ).