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third instar larvae

International Journal of Tropical Insect Science (1)

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Ultrastructural features of the larval Malpighian tubules of the flesh fly Sarcophaga ruficornis (Diptera: Sarcophagidae)
Ruchita Pal, Krishna Kumar
Journal:

International Journal of Tropical Insect Science / Volume 32 / Issue 3 / September 2012

Published online by Cambridge University Press:

10 October 2012, pp. 166-172

Print publication:

September 2012
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The larval Malpighian tubules of Sarcophaga ruficornis Fab. consist of two types of cells, namely principal and stellate cells. The principal cells are characterized by a large euchromatic nucleus, well-developed basal plasma membrane infoldings associated with mitochondria and prominent luminal microvilli containing mitochondria with well-developed cristae. The central cytoplasm of the cells contains clear vacuoles, lysosomes, mineral concretions or spherocrystals, lipid droplets and peroxisomes. The stellate cells are thin with extremely short basal plasma membrane infoldings and luminal microvilli devoid of mitochondria. The ultrastructural features of the principal cells show the characteristic of transporting cells engaged in water and ion transport. The cells are separated by septate junctions. The tubules are richly supplied by the tracheae.