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Thelohanellus testudineus n. sp. ( M yxosporea: B ivalvulida) infecting the skin of allogynogenetic gibel carp C arassius auratus gibelio ( B loch) in C hina
Author(s) -
Liu Y,
Jia L,
Huang M J,
Gu Z M
Publication year - 2014
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/jfd.12141
Subject(s) - carp , biology , fishery , fish <actinopterygii>
A T helohanellus species was encountered during a survey on T helohanellus diversity of C arassius auratus gibelio ( B loch) in C hina. The infection is characterized by the presence of large cysts of 1.4–3.2 cm in diameter in the skin of host. Mature spores were ampullaceous in frontal view and testudinate in lateral view, measuring 19.7 ± 0.7 (18.6–20.8) μm long, 7.6 ± 0.4 (6.6–8.4) μm wide and 7.3 ± 0.5 (6.6–8.8) μm thick. The single polar capsule was elongated pyriform, with 11.1 ± 0.5 (10.0–11.9) μm long and 5.3 ± 0.3 (4.3–5.8) μm wide. Polar filaments coiled with 7–8 turns. Scanning electron microscopy revealed a smooth spore surface with flat side and convex side. The sutural line was straight or ‘ S ’ like, running near the middle of the valves. Histologically, the large cysts consisting of numerous small plasmodia developed in the dermis of the skin. The BLAST search indicated that the newly obtained ssr RNA gene sequences did not match any available sequences in G en B ank and phylogenetic analysis placed it in the T helohanellus clade. Based on morphology and molecular differences with reported T helohanellus spp., this parasite was described as a new species of genus T helohanellus .