No abstract

O objetivo deste estudo foi obter dados sobre a morfologia e morfometria de nematóides da espécie Baruscapillaria obsignata, parasitos de Columba livia. Para as análises morfométricas, 41 espécimes (13 machos e 28 fêmeas) foram medidos em microscópio de campo claro adaptado com ocular micrométrica. O comprimento do corpo das fêmeas variou de 11.8 a 18.0 mm (14.8 ± 2.0 mm). A maior largura do corpo variou de 65 a 92.5 µm (74.32 ± 7.6 µm). A distância entre a vulva e a porção final do esôfago variou de 50 a 200 µm (101.31 ± 42.2 µm), e o comprimento da vagina variou de 55 a 210 µm (135.92 ± 41 µm). A largura dos ovos variou de 27.08 a 34.28 µm (29.56 ± 2 µm), e o comprimento de 45.83 a 56.87 µm (51.08 ± 3 µm). O comprimento do esôfago variou de 6.32 a 4.6 mm (5.42 ± 0.55 mm). O comprimento do corpo dos machos variou de 5.82 a 11.25 mm (9.29 ± 1.5 mm) e a largura do corpo, de 42.5 a 110 µm (59.77 ± 18.92 µm). O comprimento do espículo variou de 1.0  a 4.25 mm (1.55 ± 0.89mm) e a largura do espículo, de 7.5 a 12.5 µm (9.58 ± 1.79 µm). Os resultados do estudo morfológico e morfométrico estão de acordo com os dados apresentados por outros autores para esta espécie. As características morfológicas e morfométricas, hospedeiros e habitat de B. obsignata são similares àqueles atribuídos a Capillaria dujardini, confirmando que se trata de uma única espécie.

The aim of this study was to obtain data on the morphology and morphometry of pre-ovigerous and post-ovigerous adults of the species Tanaisia (Paratanaisia) bragai, using confocal laser scanning microscopy to obtain tomographic images of the suckers and tegument. For morphometric analysis, 45 specimens (30 pre-ovigerous adults and 15 post-ovigerous adults) were measured with the aid of an ocular micrometer coupled to the objective of a photonic microscope. Pre-ovigerous and post-ovigerous adult individuals, stained with Mair carmalumen and mounted in permanent preparations, were analyzed by means of confocal laser scanning microscopy. Positive correlation was detected between the body length and ovary length of post-ovigerous adults (rs: 0.774; p<0.01), as well as between the body length and testes (rs: 0.604 and 0.659; p< 0.05), the body length and the length of uterus (rs: 0.839; p< 0,01) and between the ovary width and egg length (rs: 0.777; p<0.01). Morphological study of the pre-ovigerous adults demonstrated that the ovary and testes develop simultaneously before the development of the uterus and vitelline glands. The acetabulum was detected in pre-ovigerous adults stained with hematoxilin and observed using light microscopy. In these specimens, the acetabulum measured 36.7 ± 6.9 µm (25-50 µm) in width and 39.91 ± 6.8 µm (25-55 µm) in length. The acetabulum was not detected in post-ovigerous adults observed with light microscopy. However, this structure was detected using confocal miscrocopy. In the post-ovigerous specimens, the acetabulum presented a reduced size compared to the pre-ovigerous adults. This may imply that this structure has more functional significance in the larval and pre-ovigerous stages.

The objective of the present study was to describe the composition and structure of the helminth community present in domestic pigeons, in the municipality of Juiz de Fora, Minas Gerais, Brazil. The helminthological survey of 35 hosts revealed the presence of two digenetic trematodes, Tanaisia (Paratanaisia) bragai (prevalence 51.42%, mean intensity 288.8 ± 403.86 and  mean abundance 148 ± 320.9) and T. inopina (prevalence 2.85% and  mean abundance 0.68 ± 4.05); five cestodes, Raillietina allomyodes (prevalence 34.28%, mean intensity 6.66 ± 9.14 and  mean abundance 2.28 ± 6.11), Raillietina sp. (prevalence 37.14%, mean intensity 9 ± 10.68 and  mean abundance 3.34 ± 7.7), Skrjabinia bonini (prevalence 20%, mean intensity 2.14 ± 1.21 and  mean abundance 0.42 ± 1), Skrjabinia sp.( prevalence 5.7%, mean intensity 6 ± 7 and  mean abundance 0.34 ± 7) and Fuhrmanneta sp. (prevalence 2.85% and  mean abundance 0.028 ± 0.16) and four nematodes, Baruscapillaria obsignata (prevalence 51.42%, mean intensity 29.72 ± 44.2 and  mean abundance 15.28 ± 34.7); Ascaridia columbae (prevalence 51.42%, mean intensity 60.55 ± 79.88 and  mean abundance 31.14 ± 64.2); Tetrameres fissipina (prevalence 14.28%, mean intensity 346.3 ± 504.4 and  mean abundance 49.42 ± 212.1) and Synhimanthus (Dyspharynx) nasuta (prevalence 2.85% and  mean abundance 0.028 ± 0.16). Among the examined hosts, 97.2 % were found parasitized by at least one helminth species. In accordance with the prevalence of each species T. bragai, A. columbae and B. obsignata were considered secondary species and T. inopina, T. fissipina, S. nasuta, S. bonini, Skrjabinia sp., R. allomyodes, Raillietina sp. and Fuhrmanneta sp. were considered satellite species. All the species exhibited aggregate distributions, which is the most common distribution pattern in helminth populations.