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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 93, No. 1, 1998, pp. 71-79
Bioline Code: oc98014
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 93, No. 1, 1998, pp. 71-79

 en Morphological study of the larval spiracular system in eight Lutzomyia species (Diptera: Psychodidae)
Anna Maria Fausto; M Dora Feliciangeli; Michele Maroli & Massimo Mazzini

Abstract

The morphology of the spiracles of fourth instar larva in eight sandfly
species were examined by light and scanning electron microscopy. Species
studied were: Lutzomyia longipalpis (Lutz & Neiva), L. ovallesi (Ortiz), L.
youngi Feliciangeli & Murillo, L. evansi (Nunez-Tovar), L. trinidadensis
(Newstead), L. migonei (Franca), L. absonodonta Feliciangeli, and L.
venezuelensis (Floch & Abonnenc).  

In larvae of all eight species both thoracic and abdominal spiracles are located at the top of a globular bulge. Their structure consists of a spiracular plate with a sclerotized central portion and a rose-like peripheral portion. The latter has circularly arranged papillae, separated from each other by elongated septa. Each papilla is longitudinally crossed by a fine cleft dividing it into two identical parts. The taxonomic and adaptative value of spiracular morphology is discussed.

Keywords
sandfly - thoracic and abdominal spiracles - amphipneustic larvae - light and scanning electron microscopy

 
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