Synopsis of the species of the genus Zschokkella Auerbach, 1910 (Myxozoa: Bivalvulida: Myxidiidae)
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Synopsis of the species of the genus Zschokkella Auerbach, 1910 (Myxozoa: Bivalvulida: Myxidiidae) Mark A. Matsche
. Violetta Yurakhno
. Jinyong Zhang
. Hiroshi Sato
Received: 2 March 2020 / Accepted: 2 November 2020 Ó Springer Nature B.V. 2020
Abstract A synopsis of the species of Zschokkella Auerbach, 1910 (Myxozoa: Bivalvulida: Myxidiidae) is presented, including 94 nominal species from piscine hosts and 3 additional nominal species from amphibian or reptilian hosts. The most relevant morphological and morphometric features of both myxospores and trophozoite stages (when available) are presented for each species in tabulated format.
Introduction The genus Zschokkella Auerbach, 1910, named for the Swiss zoologist and parasitologist Friedrich Zschokke, was proposed to accommodate the newly described
M. A. Matsche (&) Maryland Department of Natural Resources, Cooperative Oxford Laboratory, Oxford, Maryland, USA e-mail: [email protected] V. Yurakhno A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, 2 Nakhimov Ave, Sevastopol 299011, Crimea J. Zhang The Laboratory of Aquatic Parasitology, School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao 266237, China
Zschokkella hildae Auerbach, 1910 from the kidney and urinary bladder of three members of the fish order Gadiformes, Phycis blennoides Bru¨nnich, Gadus morhua Linnaeus and Pollachius virens Linnaeus. Auerbach (1910) defined the genus Zschokkella as having ‘‘spores semicircular from the side with edges extended, at both ends a large circular polar capsule not open to the outer edges as Myxidium Bu¨tschli, 1882, but asymmetrically to the flat side; bivalve, shell thick, with a seam line that runs in an arc towards the spore’’ (translation from German). The current definition of Zschokella is listed in Lom & Dykova´ (2006): ‘‘spores ellipsoidal in sutural view and slightly bent or semicircular in valvular view, with rounded or bluntly pointed ends; shell valves smooth or with ridges; the suture is straight, curved or sinuous; polar capsules almost spherical, open slightly subterminally and both
J. Zhang Key Laboratory of Aquaculture Diseases Control, Ministry of Agriculture, State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China H. Sato Laboratory of Parasitology, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1, Yoshida, Yamaguchi City, Yamaguchi 753-8515, Japan
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to one side; the sporoplasm is binucleate; the trophozoites are disporic to polysporic, the latter with pansporoblast formation.’’ The taxonomy of myxozoans is largely based on spore morphology, but other features including host, habitat, tissue tropism, and information on the trophozoite stages may be useful in distinguishing taxa (Lom & Arthur, 1989; Lom & Dykova´, 2006). However, recent molecular phylogenies of myxozoans generally do not agree with the traditional classification
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