Drosophila

refers to body of insect during development

refers to body lengthening during development

• the stage of maximus body lengthening
• phylotypic stage of insect development

developmental stage at which members of an animal group most resemble each other

• middle part of body
• has 3 segments:
• prothorax, mesothorax, metathorax
• all segments develop a pair of legs on ventral side
• meso and metathorax also develop a pair of wings on dorsal side

has 2 wings

• segmental divisions in the embryo
• not quite the same as segments seen in the larva and adult

• nerve cord: central nervous system
• on ventral side
• heart on dorsal side
• oxygen diffuses through tracheal tubes

• undergoes complete metamorphosis
• egg hatches into larva
• larva molts twice (so 3 larval stages) then becomes a pupa: body is remolded to form the adult
• much of adult body formed from imaginal discs