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

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

Diptera; Dermatobia hominis; midgut; metamorphosis; histology; post-embryonic development

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 Lello^I; Ana Maria Vieira^II,III

^IDepartamento de Morfologia, Instituto de Biociências, Universidade Estadual Paulista. 18618-000 Botucatu, São Paulo, Brasil. E-mail: [e-mail]

^IIDepartamento de Biologia, Universidade do Sagrado Coração. 17044-160 Bauru, São Paulo, Brasil. E-mail: [e-mail]

^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 5^th 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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Datas de Publicação

• Publicação nesta coleção
  30 Abr 2009
• Data do Fascículo
  Mar 2001

Histórico

• Aceito
  29 Mar 2001
• Recebido
  27 Dez 1999