TY - JOUR
TI - Ultrastructural Re-description of Henneguya piaractus (Myxozoa), a Parasite of the Freshwater Fish Piaractus mesopotamicus (Teleostei, Characidae) from the Paraguai River, Brazil
AU - Azevedo, Carlos
AU - Marques, Débora K. S.
AU - Casal, Graça
AU - Amaral, Cristiane M. C.
AU - Silva, Edinael V.
AU - Matos, Patrícia
AU - Matos, Edilson Rodrigues
TI - Ultrastructural Re-description of Henneguya piaractus (Myxozoa), a Parasite of the Freshwater Fish Piaractus mesopotamicus (Teleostei, Characidae) from the Paraguai River, Brazil
AB - Ultrastructural analyses of fish-infecting myxosporean Henneguya piaractus that is found in the gill lamellae of the freshwater teleost Piaractus mesopotamicus (Characidae) and collected from the Paraguai River, Brazil were described. The parasite occurs within large whitish spherical to ellipsoidal polysporic cysts (up to 2.5 mm long) delimited by a layer of fibroblasts generally connected with some capillaries on the gill epithelium. No external morphological signs of disease were visible in the infected fishes. The tailed spores measured 61.5 ± 0.91 (60.2–62.6) μm in total length and ellipsoidal spore body 21.1 ± 0.62 (20.6–21.9) μm long, 6.7 ± 0.40 (6.2–7.3) μm wide and 2.5 ± 0.54 (2.0–3.1) μm thick. The spore wall was about 97 nm of thickness and consisted of a thin electron-dense exospore and a thick electron-lucent endospore with about 85 nm of thickness. The tailed spores were composed of two equal–sized shell valves adhering together along the straight suture line each having in continuity a equal caudal tapering tail measuring 40.5 ± 1.02 (38.7–43.1) μm in length. Two symmetric polar capsules measured 9.8 ± 0.28 (9.3–10.1) μm long and 1.9 ± 0.37 (1.4–2.4) μm wide, each having a polar filament with 10–11 (rarely 12) coils
VL - 2010
IS - Volume 49, Issue 2
PY - 2010
SN - 0065-1583
C1 - 1689-0027
SP - 115
EP - 120
UR - https://ejournals.eu/en/journal/acta-protozoologica/article/ultrastructural-re-description-of-henneguya-piaractus-myxozoa-a-parasite-of-the-freshwater-fish-piaractus-mesopotamicus-teleostei-characidae-from-the-paraguai-river-brazil
KW - Brazilian fish
KW - Henneguya piaractus
KW - Myxozoa
KW - parasite
KW - ultrastructure