| larval ontogeny and morphological variations of psaroniocompsa incrustata (lutz) (diptera: simuliidae) in the state of rio grande do norte, northeastern brazil. | psaroniocompsa incrustata (lutz) is an antropophilic species widely distributed in central and south america. it is the vector of onchocerca volvulus in a brazilian focus and has been considered a plague in several areas of this country. the objective of this study was to determine the number of larval instars and to describe the morphological variations and teratologies of a population of p. incrustata from the pium river, rio grande do norte state. the number of larval instars was determined m ... | 2009 | 19618052 |