Xanthorhoini, Pierce, 1914

Young, Catherine J., 2006, Descriptions of the eggs of some southern Australian Geometridae (Lepidoptera), Zootaxa 1287, pp. 1-294 : 1-294

Comment on Xanthorhoini

The species described in this tribe form two distinct groups. A. orina , C. euclidiata and E. subidaria have eggs with a soft, convoluted chorion well­marked on all surfaces with generally concave cells with broad rounded walls. Aeropyles are unelevated with small openings and the chorion is rough. The eggs of E. subidaria differ from the other two species by the presence of multiple aeropyles situated along the cell walls, a feature also found in several Nearctic xanthorhoines e.g. Xanthorhoe packardata McDunnough , X. labradorensis Packard , Eppirrhoe alternata Müller and Euphyia intermediata ( Salkeld 1983) , [see discussion on multiple aeropyles above, under Acalyphes (Archiearinae) ]. The eggs of A. orina , C. euclidiata and E. subidaria also broadly resemble the eggs of the Nearctic larentiines such as Xanthorhoe Hübner spp. and Orthonama obstipata Fabricius in other features such as roundly broad cell walls and a fine reticulation overlaying the micropylar cell walls ( Salkeld 1983).

On the other hand, all the Chrysolarentia species apart from C. euclidiata contrast with the other genera by a lack of chorionic architecture and a smooth, featureless surface. The shape of the eggs tends to be oblong or globular or broadly ovoid. These eggs do not resemble the Nearctic xanthorhoines either; however the distinct pyramidal shape of C. decisaria and C. heliacaria is also a feature of the Nearctic hydriomenine Dysstroma hersiliata hersiliata, Guenée. A lack of sculpturing and smooth featureless surface texture is also a consistent character in the Nearctic genus Eupithecia Curtis (Eupithecini) ( Salkeld 1983) .