Imaginal Discs in Insects
Imaginal Discs in Insects
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In the body cavity of the caterpillar, for instance, buried beneath the dorsal meso- and metathoracic integument are two pairs of small disc-like islands of cells. These remain unfunctional and inactive dur- ing the caterpillar's lifetime although growing constantly, but during its meta- morphosis they develop into the two pairs of wings of the butterfly.* Similar cell- islands are present in the larval coleop- teron.f The lai*val hymenopteron also possesses them f ; while beneath its ventral t...horacic integument are three other pairs of cell-islands whose fate it is to furnish the imaginal legs. In the nematocera, also, ventral and dorsal pairs of cell-islands are present in the larva, as the observations of Weismann on Corethra J first showed. This classic investigation demonstrated the presence of three dorsal pairs of cell- islands as well as three ventral pairs. They are sit- uated in the body cavity of the larva just beneath the integument, a dorsal and a ventral pair in the prothorax, destined to form the pupal spiracles and the *Swammerdam.
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You can find similar books in the "Read Also" column, or choose other free books by Henry Sherring Pratt to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In the body cavity of the caterpillar, for instance, buried beneath the dorsal meso- and metathoracic integument are two pairs of small disc-like islands of cells. These remain unfunctional and inactive dur- ing the caterpillar's lifetime although growing constantly, but during its meta- morphosis they develop into the two pairs of wings of the butterfly.* Similar cell- islands are present in the larval coleop- teron.f The lai*val hymenopteron also possesses them f ; while beneath its ventral t...horacic integument are three other pairs of cell-islands whose fate it is to furnish the imaginal legs. In the nematocera, also, ventral and dorsal pairs of cell-islands are present in the larva, as the observations of Weismann on Corethra J first showed. This classic investigation demonstrated the presence of three dorsal pairs of cell- islands as well as three ventral pairs. They are sit- uated in the body cavity of the larva just beneath the integument, a dorsal and a ventral pair in the prothorax, destined to form the pupal spiracles and the *Swammerdam.
What to read after Imaginal Discs in Insects?
You can find similar books in the "Read Also" column, or choose other free books by Henry Sherring Pratt to read onlineMoreLess
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