Abstract
Dipetalonema gracile (Rudolphi, 1809) (Filarioidea: Onchocercidae) is one of six species of cavities filarial parasites of Neotropical non-human primates. The present study recorded the occurrence of D. gracile, provides morphological and morphometric data and extends the geographical distribution. Adult filariae were obtained from the thoracic and abdominal cavities of 38 specimens of woolly monkey, which were used for local human consumption, in the northeastern Peruvian Amazon. Male and female filarids were processed and analysed using light and scanning electron microscopy. Details of the cephalic papillae, post-cloacal bands and papillae, vulva, phasmid position and lateral appendages are showed by scanning electron microscopy and is recorded the occurrencce of Lagothrix poeppigii monkey as a new host of this filaria in the Yavari-Mirin river basin, Peruvian Amazon.
Highlights
The genus Dipetalonema (DIESING, 1861) belongs to the family Onchocercidae, and it has had other names including Filaria (RUDOLPHI, 1809; MOLIN, 1858) and Acanthocheilonema (BOULENGER, 1920)
The geographical distribution of Dipetalonema throughout the Neotropics is imprecise because most records are from captive primates or only one host, such as D. freitasi in a necropsy of Cebus capucinus at the London Zoo (BAIN et al, 1987), D. robini in Saimiri sciureus in Guyana (PETIT et al, 1985), D. graciliformis in Saguinus midas in French Guiana (BAIN et al, 1986), and D. yatesi in Ateles chamek in the Beni region of Bolivia (NOTARNICOLA et al, 2007)
The present study describes, for the first time, parasitism by D. gracile in the silvery woolly monkey, Lagothrix poeppigii (Schinz, 1844), which is one of the largest non-human primates found in the western Amazon and is commonly hunted for food by human subsistence hunters
Summary
The genus Dipetalonema (DIESING, 1861) belongs to the family Onchocercidae, and it has had other names including Filaria (RUDOLPHI, 1809; MOLIN, 1858) and Acanthocheilonema (BOULENGER, 1920). The geographical distribution of Dipetalonema throughout the Neotropics is imprecise because most records are from captive primates or only one host, such as D. freitasi in a necropsy of Cebus capucinus at the London Zoo (BAIN et al, 1987), D. robini in Saimiri sciureus in Guyana (PETIT et al, 1985), D. graciliformis in Saguinus midas in French Guiana (BAIN et al, 1986), and D. yatesi in Ateles chamek in the Beni region of Bolivia (NOTARNICOLA et al, 2007). According to Dunn & Lambrecht (1963), D. gracile has been reported in the Neotropics in Ecuador, Peru and Brazil as a parasite of S. sciureus, Ateles paniscus and Saguinus nigricollis, but like the other species of the genus, most reports are not geographically explicit. Only the D. gracile specimens recorded in S. sciureus have complete descriptions of their morphometric data made by Bain et al (1986) for specimens from French Guiana (49 ED, Collection of the National Museum of Natural History) and by Notarnicola et al (2008) for specimens from the Ecuadorian Amazon (CHMLP Nro5556 and Nro5557, Collection of the Museo de La Plata)
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