Chlorocoma externa Walker, 1816

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

Chlorocoma externa Walker (Figs 790–798)

Oviposition 2♀ code nos.: G398, G401

Oviposition period: 2 Nov.–20 Dec.

Batch size: 10–30; (n = 3)

Realised fecundity: 30

Incubation time (days): 6

Batch configuration and attachment: Very loosely attached, singly or in small groups (Fig. 790).

Colour: Yellow to yellowish­green, glittering, becoming dark yellow then grey on maturity (Fig. 790).

Size (mm) (n=13): L = 0.75 ± 0.01, W = 0.53 ± 0.01, T = 0.38 ± 0.01.

Width/length: 0.71

No. of females: 3

Aeropylar opening size (m) (n=5): L = 1.67 ± 0.13, W = 1.3 ± 0.08.

Relative aeropylar opening size: 2.6

Micropyles: Indistinct (Figs 791 & 792)

No. of openings: 1

No. of cells in rosette: 7

No. of rows of cells in micropylar area: 5

Shape: Narrow, elongated, compressed dorso­ventrally with narrow flat lateral sides perpendicular to wide flat lateral sides (pill­box shaped), bluntly ovoid from top view (Figs 790, 791 & 793), anterior pole truncated, wedge­shaped laterally (Fig. 794).

Characteristics: Egg marked on all surfaces by flat, hexagonal cells with narrow, slightly elevated walls giving a netted appearance (Figs 791–795, 797). Aeropyles conspicuous, elevated, openings moderately small (Fig. 796), in two narrow bands encircling egg longitudinally along upper and lower edges of narrow lateral sides. Rosette cells slightly recessed; micropylar cell walls overlain by very narrow, shallow reticulum (Fig. 792). Chorion rough, generally shallowly wrinkled and pitted (Fig. 797), roughness more pronounced on narrow lateral sides, edges (Figs 796 & 798).