Silk is produced in one of three positions on the insect body: in the labium (as modified "salivary" glands), Malpighian tubules
, or in a variety of dermal glands.
To analyze the presence of sex chromatin in non-irradiated individuals, Malpighian tubules
from male and female T.
Se is shown to accumulate preferentially in the malpighian tubules
and in the midgut of insects.
In the same way, it is also the only genus in which the species produce silk from the anus using modified Malpighian tubules
(Ferriere 1941), for the spinning of the cocoon.
Associated with the digestive tract, but part of the excretory system, are the Malpighian tubules
Forms of cell death and cell survival responses which have been previously demonstrated in Malpighian tubules
Temperature-shocked larvae (positive controls) showed a maximum [beta]-galactosidase activity in all the tissues except Malpighian tubules
However, when the characters that have been used to connect the insects and the myriapods were reviewed, the results suggested that they are either suspected of being convergent (i.e., Malpighian tubules
, tracheae) or are not significant in a phylogenetic discussion (loss or absence of characters) (1, 2).
Testes length (TL), testes area (TA), malpighian tubules
length (MTL), and malpighian tubules
area (MTA) were measured as shown in Figure 1.
Giebultowicz of Oregon State University in Corvallis and her colleagues have found biological clocks in the testes of moths and in the fruit fly's Malpighian tubules
, excretory organs similar to kidneys.