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LARVAL TREMATODES IN FRESHWATER GASTROPODS FROM MATO GROSSO, BRAZIL: DIVERSITY AND HOST-PARASITES RELATIONSHIPS
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Affilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Malacologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Malacologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Malacologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Malacologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Malacologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Malacologia. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Malacologia. Rio de Janeiro, RJ, Brasil.
Abstract
A survey for freshwater gastropods carrying trematodes parasites was conducted in Manso Dam and the
surrounding areas frequented by tourist, focusing particularly on the Pantanal region. Infected snails were recovered
from twelve of the eighteen investigated municipalities and forty-one cercaria-snail pairings were recorded.
Among these pairings were several first records of snails serving as intermediate hosts for trematodes in Brazil
including Biomphalaria amazônica Paraense, 1966, Biomphalaria occidentalis Paraense, 1981, Marisa planogyra
Pilsbry,1933, Pomacea maculata Perry, 1830, Pomacea scalaris (d’Orbigny, 1835) and Gundlachia radiata
(Guilding, 1828). Echinostomatidae and Strigeidae were the most common trematode families (ca. 47%) and
the greatest diversity of larvae were obtained from Drepanotrema lucidum (Pfeiffer, 1839). Paramphistomatidae,
Schistosomatidae or Spirorchiidae and Notocotylidae or Pronocephalidae were recovered in D. lucidum for the
first time extending the number of families which use this gastropod as intermediate host. Although no specimens
were found harboring larval stages of Schistosoma mansoni Sambon, 1907 other trematode larvae were discovered,
including the Schistosomatidae Brevifurcate apharingeate cercaria that can cause dermatitis in humans. Continued
studies on the taxonomy and biology of trematodes are essential to better understand the biodiversity of these
parasites as well as the epidemiological aspects for control of associated zoonosis.
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