First Record of Zanclorhynchus chereshnevi (Congiopodidae) off the Crozet Archipelago, Southern Ocean
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First Record of Zanclorhynchus chereshnevi (Congiopodidae) off the Crozet Archipelago, Southern Ocean M. Yu. Zhukov* Zoological Institute, Russian Academy of Sciences—ZIN RAS, St. Petersburg, Russia *e-mail: [email protected] Received February 5, 2020; revised February 7, 2020; accepted February 7, 2020
The first record of Zanclorhynchus chereshnevi off the Crozet Archipelago was described. Previously, only the type series of this species off the Prince Edward Islands was known. Keywords: Chereshnev’s horsefish, Zanclorhynchus chereshnevi, new record, Southern Ocean DOI: 10.1134/S0032945220050136
Horsefishes of the genus Zanclorhynchus inhabit the banks and shelves of the subantarctic islands of the Indian Sector of the Southern Ocean, as well as the seamounts of the Pacific-Antarctic Ridge (South Central Pacific). The genus and nominative species are described based on the results of an expedition on the H.M.S. Challenger from the Kerguelen Islands (Günther, 1880). Within the family, horsefishes are well distinguished by the presence of spines on the head, a dorsal fin that does not continue on the head, the absence of branched rays in the fins, and two dorsal fins. The genus remained monotypic for a long time, and only in 2016, the second species, Z. chereshnevi, was described (Balushkin and Zhukov, 2016). Until now, only the type series of the species off the Prince Edward Islands was known. Among the unassembled ZIN collections, one specimen of this species off Crozet Islands was found, which was collected in one trawl with three Z. spinifer specimens. The present work is devoted to the description of this specimen. MATERIALS AND METHODS The measurements follows methods previously used in the description of new taxa of horsefishes (Balushkin and Zhukov, 2016; Zhukov and Balushkin, 2018; Zhukov, 2019). The spines lengths counted as the mean from both sides of the head. The fourth ray of the first dorsal fin of the studied specimen is broken; to calculate the arming index, the arithmetic mean of the lengths of the fourth rays of the type series was taken for its length. The skeleton was studied under X-ray images obtained on the PRDU-02 X-ray diffractometer. C o m p a r a t i v e m a t e r i a l: Zanclorhynchus chereshnevi: ZIN no. 56046 – holotype TL 252 mm, SL 200 mm, Fishery Research Vessel (FRV) Aelita,
Prince Edward Islands, 46°55′ S 37°58′ E, depth 170 m, January 18, 1968, bottom trawl, collectors A.I. Karpenko and G.S. Volya; ZIN no. 45674—paratypes, 4 specimens, TL 209−251 mm, SL 165−203 mm, collected with the holotype. RESULTS M a t e r i a l: ZIN no. 56517—TL 239 mm, SL 190 mm, FRV Aelita, st. 41, Crozet Islands, 45°52′ S 49°54′ E, depth 230 m, January 25, 1968, collectors A.I. Karpenko and G.S. Volya. D e s c r i p t i o n (Fig. 1, Table 1). The pigmentation of the body after fixation in formalin and storage in alcohol is brown-yellow. The structure of the sensory system corresponds to the general scheme for the genus (Zhukov and Balushkin, 2018, Fig. 1), the infraorbital canal without
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