Thalaina angulosa Walker

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

Thalaina angulosa Walker (Figs 363–369)

Oviposition

6♀ code nos.: G226, G233, G240, G245, G265, G268

Oviposition period: 6–22 May

Batch size: 24.6 ± 8.7 range: 5–50 (n = 8)

Realised fecundity: 32.4 ± 8.3 (range): 12–65

Incubation time (days) (n=5): 31.4 ± 1.2 (on moistening)

Batch configuration and attachment: Attached, singly.

Colour: Light green becoming greyish brown.

Size (mm): (n=15) L=0.95 ± 0.01, W=0.78 ± 0.02, T=0.62 ± 0.01

Width/length: 0.82

No. of females: 3

Aeropylar opening size (m) (n=6): L=2.91 ± 0.14, W=2.29 ± 0.08

Relative aeropylar opening size: 3.4

Micropyles: Indistinct (Figs 363 & 364)

No. of openings: obscure

No. of cells in rosette: 7

No. of rows of cells in micropylar area: 4

Shape: Broad, bluntly ovoid; anterior pole truncated; posterior pole sub­acute; flattened dorso­ventrally; wedge­shaped laterally; anterior pole slightly angled to horizontal axis (Figs 363, 365 & 366).

Characteristics: Egg marked on all surfaces by convex, hexagonal cells with narrow recessed walls (Figs 365–369). Aeropyles elevated, openings moderately large, only present around perimeter of anterior pole (Fig. 368). Primary, secondary cells of micropylar area slightly recessed (Fig. 364). Chorion smooth, undulating (Fig. 369).