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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.18 no.1 Curitiba Mar. 2001

http://dx.doi.org/10.1590/S0101-81752001000100009 

Desenvolvimento pós-embrionário do intestino médio de Dermatobia hominis (Linnaeus Jr.) (Diptera, Cuterebridae)

 

Post-embryonic development of Dermatobia hominis (Linnaeus Jr.) (Diptera, Cuterebridae) midgut

 

 

Edy de LelloI; Ana Maria VieiraII,III

IDepartamento de Morfologia, Instituto de Biociências, Universidade Estadual Paulista. 18618-000 Botucatu, São Paulo, Brasil. E-mail: montenegro@laser.com.br
IIDepartamento de Biologia, Universidade do Sagrado Coração. 17044-160 Bauru, São Paulo, Brasil. E-mail: labbio@usc.br
IIIBolsista-FAPESP processo nº 94/2589-9

 

 


ABSTRACT

Dermatobia hominis (Linnaeus, 1781) midgut is internally lined by an epithelium of polytenic cells, some low others prismatic with well developed brush border. Their apical portion are enlarged by secretory vesicles, forming button-like structures that are pinched off to the lumen, some accompained by the nucleus characterizing apocrine and holocrine secretions. This epithelium is gradually renewed by small, non polytenic regenerative cells, found scattered at its basal portion. At the end of the third instar the metamorphosis begins. The epithelial cells present signs of degeneration and at the first day of pupation the regenerative cells increase in number. By the 5th day of pupation these regenerative cells, besides being increased in number, differentiate themselves into two layers: one similar to the dense conective tissue that sustainning the larval epithelium is pinched off to the midgut lumen forming the "yellow bodies"; the other, develops right under it as the imaginal epitelium. The disorganized muscles bundles of the midgut wall, are invaded by phagocytes. At the end of pupation the midgut has a low prismatic epithelium with brush-border. In the adult, the torax portion of the midgut has prismatic homogeneously basophilic epithelium while in the abdominal portion the epithelium is made of high prismatic cells full of small vacuoles. The larval midgut epithelium suffers programmed cell death non compatible with apoptose. During the metamorphosis the midgut lenght diminishes from 31mm in the larva to 14mm in the adult.

Key words: Diptera, Dermatobia hominis, midgut, metamorphosis, histology, post-embryonic development


 

 

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Recebido em 27.XII.1999; aceito em 29.III.2001.

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