摘要

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) mu m, width 9.7 +/- 0.4 (9-10) mu m, thickness 7.7 +/- 0.3 (7-8) mu m; two polar capsules ovoid slightly dissimilar in size, length 6.4 +/- 0.4 (6-7) mu m, width 3.8 +/- 0.3 (3-4) mu m, 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.

  • 出版日期2017-1