TABLE 1.

Developmental Events in Aedes aegypti Embryogenesis (after Raminani and Cupp, 1978). The timing of major embryonic developmental events is indicated in hrs after egg laying (AEL) at 25° C.

Age (hrs AEL)	Event
0.5	Polar body formation
1	Fertilization
1-2	1st and 2nd mitotic divisions
3	Formation of pole cells and primary yolk cells
4	Peripheral migration of cleavage nuclei
5	Pole cells outside the blastoderm
6	Syncitial blastoderm
8	Cellularization of blastoderm
9	Germ band formation; secondary yolk cells
11	Pole cell entry into the blastoderm
12	Initiation of gastrulation; Migration of presumptive mesodermal cells, elongation of the germ band
14	Amnion and serosa formation
15	Segmentation of the embryo begins; Ventral nerve cord formation begins.
18	Labral lobe formation
19	Anterior midgut-stomodaeal and posterior midgut-proctodaeal invaginations form.
25	Antennae, mandibles and maxillae begin to form; anterior migration of the mouthparts begins.
30	Vitelline membrane present; germ band retraction begins; labial lobes appear.
35	Blastokinesis and dorsal closure begin; foregut differentiation and formation of the midgut begins; formation of the brain and gonads initiates.
40	Differentiation of the suboesophageal ganglion and tracheal system starts.
45	Hindgut differentiation begins; formation of the retrocerebral complex and stomodaeal nervous system initiates.
50	Breakdown of the amnion and serosa; oenocytes and fat cells are formed; muscles of the head and mouthparts begins to form.
60	Differentiation of trunk musculature
65	Heart formation
75	Formation of the hatching spine begins.
96	Embryogenesis completed