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A novel myxosporean parasite Myxobolus klamathellus n. sp. (Cnidaria: Myxosporea) from native blue chub (Gila coerulea) in Klamath Lake, Oregon

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Blue chub, Gila coerulea Girard, 1856 is a freshwater cyprinid fish native to inland drainages of western North America. It has not previously been recorded as a host of any myxosporean parasite (Cnidaria: Myxosporea), despite myxosporeans being cosmopolitan in freshwater and marine fishes worldwide and sympatric with this host. Herein, we describe a novel myxosporean from subcutaneous cysts in native blue chub from Klamath Lake, Oregon. Myxospores were consistent with genus Myxobolus, being obovoid but compressed in thickness, length 14.3 ± 0.4 (13–15) μm, width 9.7 ± 0.4 (9–10) μm, thickness 7.7 ± 0.3 (7–8) μm; two polar capsules ovoid slightly dissimilar in size, length 6.4 ± 0.4 (6–7) μm, width 3.8 ± 0.3 (3–4) μm, with four (3–5) turns of the polar filament (tubule); capsule openings apical, one in each valve cell. The small subunit ribosomal DNA sequence was up to 97 % similar to Myxobolus spp. from other cyprinids from North America and Europe. Given the novel host, unique myxospore morphometrics, and DNA sequence, we describe this as Myxobolus klamathellus n. sp.

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We thank Bill Tinniswood, ODFW, for collecting the fish. This research was supported by Research Grant No. IS-4576-13 from BARD, The United States-Israel Binational Agricultural Research and Development Fund.

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Correspondence to Stephen Douglas Atkinson.

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Atkinson, S.D., Banner, C.R. A novel myxosporean parasite Myxobolus klamathellus n. sp. (Cnidaria: Myxosporea) from native blue chub (Gila coerulea) in Klamath Lake, Oregon. Parasitol Res 116, 299–302 (2017).

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