Abstract
The embryology of L. viridana is continued to the 72-h stage, when a little over one-quarter of the embryonic period has elapsed. The origin of the segmental appendages, further development of the coelomic sacs and enteron rudiments, formation of the nerve ganglia, appearance of tracheal invaginations, migration of the germ cells, and secretion of the serosal cuticle are described. The embryonic origin of the labrum is preoral and preantennal, that of the antennae and deutocerebrum paraoral. The tritocerebrum is formed in a well-defined intercalary segment. The ventral musculature of the stomodaeum arises from intercalary mesoderm, the dorsal and lateral musculature from labral mesoderm. The outer sheaths of the Malpighian tubules are formed from mesoderm of the 10th abdominal segment, the musculature of the proctodaeum from the 11th segment. The pleuropodia differentiate rapidly and begin secreting. The germ cell rudiment subdivides into three to six pairs of germ cell clusters, which become arranged segmentally.
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