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New host records of Brazilian pentastomid species/Novos registros de hospedeiros para especies de pentastomideos do Brasil.

1. Introduction

The taxon Pentastomida comprises approximately 131 species distributed in seven families, namely Cephalobaenidae, Linguatulidae, Porocephalidae, Rallietiellidae, Reighardiidae, Sebekidae and Subtriquetridae (Almeida & Christoffersen, 1999), where they are preferentially pulmonary parasites of vertebrates, mainly reptiles (Almeida & Christoffersen, 2002).

Data regarding the ecology of pentastomids are important, but they are scarce, and in most cases these data were obtained from studies of zoological, animal house and snake house collections. In Brazil, the first works on these parasites were recorded in hosts from the Helminthological Collection of the Oswaldo Cruz Institute (CHIOC), which is the principal reference collection in terms of the diversity of neotropical pentastomids (Motta, 1963a,b; Rego, 1981; 1983; 1984). Another collection, smaller and under construction in recent years, comprises the Zoology Laboratory of the Regional University of Cariri (LZ URCA) with a total of 67 specimens of the following species Cephalobaena tetrapoda (Heymons, 1922) (LZ URCA 43-44, 158-163), Raillietiellafurcocerca (Diesing, 1835) (LZ URCA 164-170), Raillietiella gigliolii (Hett, 1924) (LZ URCA 99-101; 320-330), Raillietiella mottae (Almeida, Freire and Lopes, 2008) (LZ URCA 201-212; 351-353; 401-402), Raillietiella sp. (LZ URCA 157)

Porocephalus stilesi (Sambon, 1910) (LZ URCA 331-345) Porocephalus sp. (LZ URCA 346-350). The majority of the specimens of this collection are from the Caatinga biome (Almeida et al., 2006a, b; Almeida et al., 2008a, b; Almeida et al., 2009a, b; Anjos et al., 2007; Anjos et al., 2008; Lopes et al., 2006).

The aim of the present work was to enrich our knowledge of the biology of pentastomids by analysing the specimens and their hosts deposited in the Helminthological Collection of the Botucatu Biosciences Institute (CHIBB), located in the Laboratory of the Parasitology of Wild Animals (LAPAS) of the Universidade Estadual de Sao Paulo (UNESP).

2. Material and Methods

The respiratory tracts and body cavities of the reptiles were removed and the presence of pentastomids determined by examination under a stereomicroscope. All pentastomids found were cleared in Hoyer's medium and subsequently mounted on slides. Identifications were based on the dimensions of the hooks and copulatory spicules of the males that were measured using a microscope equipped with an ocular micrometer.

3. Results

Four species of pentastomids were found, namely Sebekia oxycephala (Sambon, 1922), Porocephalus sp., Raillietiella freitasi (Mota & Gomes, 1968) and Raillietiella furcocerca (Table 1), plus the morphospecies Raillietiella sp.1 and Raillietiella sp.2.

4. Discussion

We report here the first record of infection by pentastomids in the snake species Bothropoides mattogrossensis (Amaral, 1925), Thamnodynastes chaquensis (Bergna & Alvarez, 1993) and Liophis poecilogyrus (Wied, 1825) and the crocodilian Cayman yacare (Daudin, 1802).

Sebekia oxycephala has already been reported as a parasite of the following vertebrates: fish species Pseudoplatystoma fasciatum (Linnaeus, 1766), Pygocentrus piraya (Muller & Troschel, 1848), Synbranchus marmoratus (Bloch, 1795), Stenarchus albifrons (Bloch & Schneider, 1801), Potamotrygon motoro (Muller & Henle, 1841), Electrophorus electricus (Linnaeus, 1766), Salmo tamuco (Kner, 1860), Silurus pintado (Natterer, 1836), S. dourado, Silurus sp., Salmo sp., and Clupea sp.; mammal Pteronura braziliensis (Gmelin, 1788); and reptiles; Caiman sclerops (Dumeril & Bibron, 1836), C. crocodilus (Linnaeus, 1758), Melanosuchus niger (Spix, 1825), Tupinambis teguixin (Linnaeus, 1758), Farancia abacura (Holbrook, 1836), Eunectes murinus (Linnaeus, 1758), Boa constrictor (Linnaeus, 1758), Crotalus horridus (Linnaeus, 1758), Ophis merremi (Wagler, 1824), Spilotes pullatus (Laurenti, 1768), Bothropoides jararaca (Wied, 1824), Dimades plicatilis (Linnaeus, 1758), Micrurus sp., Tropidonotus sp., and Coluber sp. (Almeida & Christoffersen, 2002; Sambon, 1922; Rego, 1984). In the crocodilian C. yacare, the cycle of S. oxycephala was observed for the first time, where larvae of S. oxycephala were found in the stomach and intestine and adult parasites in the lung. Sebekia oxycephala utilizes fish as an intermediate host and completes its cycle in C. yacare when it eats infected fish. Cayman yacare is distributed geographically in the central part of South America, where it is found in the north of Argentina, southern Bolivia, Brazilian Pantanal and rivers of Paraguay. It feeds on aquatic invertebrates such as mollusks and crustaceans and vertebrates (fish and snakes) (Reptile Database, 2010).

The parasite R. furcocerca is a typical parasite of snakes, with a Neotropical distribution. Besides Crotalus durissus (Linnaeus, 1758), this pentastomid species was recorded in various species of snakes: Boa constrictor, Coluber lichtensteinii (Raddi, 1820), Drymarcon corais (Boie, 1827), Xenodon merremii (Wagler, 1824) and Lachesis sp. (Motta, 1963; Rego, 1983). Thamnodynastes chaquensis which represents a new host for R. furcocerca, occurs in the provinces of the Chaco, where there are reports of this species in Argentina, Paraguay, Uruguay and Brazilian Pantanal. T. chaquensis is a nocturnal snake which is abundant in the Brazilian Pantanal, where it feeds mainly on amphibians and small rodents (Franco & Ferreira, 2002).

Raillietiella sp. 1 found in the lung of B. mattogrossensis differs from R. furcocerca because the male of this species is larger than the female, but its identification at the species level was not possible due to the lack of a male in the host analysed. B. mattogrossensis occurs in Brazil (Amazonas, Goias, Mato Grosso do Sul, Rondonia, Sao Paulo and Tocantins), Bolivia, Paraguay and Argentina. The diet of this snake consists of anuran amphibians, small mammals, lizards, snakes and centipedes (Monteiro et al., 2006).

The parasitism of R. freitasi in the lizard Trachylepis atlantica (= Mabuya punctata) (Schmidt 1945) has already been reported, and besides this lizard, R. freitasi also parasitizes the species Tropidurus torquatus (Wield, 1820) and Rhinella schneideri (= Bufo paracnemis) (Werner, 1894) (see Almeida & Christoffersen, 2002). Trachylepis atlantica is a lizard endemic to the Fernando de Noronha Archipelago; this species of omnivorous lizard, feeds mainly on plant material and insects, typically ants (Rocha et al., 2009).

The specimen Raillietiella sp.2 found in Liophis poecilogyrus (Wied-Neuwied, 1825) constituted the first report of infection by pentastomids in this species of snake. The identification of the parasite at the species level was not possible due to the lack of a male. The snake L. poecilogyrus is a species with wide geographic distribution, occurring from the eastern part of Guiana to southeastern Venezuela, advancing in a south-to-southeast direction down to Bolivia and Paraguay, also reaching the Pantanal and continuing down to the Argentinian Pampas and Chaco (Reptile Database, 2011); it feeds mainly on amphibians, particularly members of the families Bufonidae and Hylidae (Pinto & Fernandes, 2004).

Although important studies on pentastomids have been published in recent years, knowledge of these parasites in Brazil still needs to be substantially extended, since the majority of the species of Squamata and vertebrates in general that are definitive hosts of these parasites still lack studies aimed at learning about the fauna of associated pentastomids and their ecological and evolutionary relations with their vertebrate hosts.

References

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Brito, SV. (a) *, Almeida, WO. (b), Anjos, LA. (c) and Silva, RJ. (c)

(a) Programa de Pos-Graduacao em Ciencias Biologicas (Zoologia), Departamento de Sistematica e Ecologia--DSE, Centro de Ciencias Exatas e da Natureza--CCEN, Universidade Federal da Paraiba--UFPB, Cidade Universitaria, Campus I, CEP 58059-900, Joao Pessoa, PB, Brazil

(b) Departamento de Quimica Biologica, Centro de Ciencias Biologicas e da Saude--CCBS, Universidade Regional do Cariri--URCA, Campus do Pimenta, CEP 63105-100, Crato, Ceara, Brazil

(c) Departamento de Parasitologia, Instituto de Biociencias, Universidade Estadual Paulista -UNESP, Distrito de Rubiao Junior, s/n, CEP 18618-970, Botucatu, SP, Brazil

* e-mail: samuelvieirab@yahoo.com.br

Received April 26, 2011--Accepted June 22, 2011--Distributed May 31, 2012
Table 1. Records of pentastomids deposited in the Helminthological
Collection of the Botucatu Biosciences Institute (CHIBB).

Host                        Parasite           Infection site

Crocodylia
Caiman yacare          Sebekia oxycephala           Lung
C. yacare                 S. oxycephala            Stomach
C. yacare                 S. oxycephala           Intestine
Squamata--snakes
Boidae
Boa constrictor         Porocephalus sp.       Coelomic cavity
  amarali
Dipsadidae
Liophis                Raillietiella sp.2           Lung
  poecilogyrus
Viperidae
Bothropoides           Raillietiella sp.1           Lung
  mattogrossensis
Crotalus durissus       Porocephalus sp.            Lung
C. durissus         Raillietiella furcocerca       Stomach
Squamata--lizards
Scincidae
Trachylepis          Raillietiella freitasi         Lung
  atlantica

      Host                 Locality               CHIBB *

Crocodylia
Caiman yacare             Corumba, MS               2394
C. yacare                 Corumba, MS               2395
C. yacare                 Corumba, MS               2396
Squamata--snakes
Boidae
Boa constrictor             unknown                 1108
  amarali
Dipsadidae
Liophis                   Corumba, MS               2099
  poecilogyrus
Viperidae
Bothropoides              Corumba, MS               2116
  mattogrossensis
Crotalus durissus         Corumba, MS         1116, 1142, 1172
C. durissus              Piramboia, SP              1932
Squamata--lizards
Scincidae
Trachylepis         Fernando de Noronha, PE         2928
  atlantica

* Numbers in the last column are the accession numbers of voucher
species in CHIBB--Helminthological Collection of the Department of
Parasitology, Institute of Biosciences, Universidade Estadual
Paulista.
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Author:Brito, S.V.; Almeida, W.O.; Anjos, L.A.; Silva, R.J.
Publication:Brazilian Journal of Biology
Date:May 1, 2012
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