A New Species of Rhynchohyalus from the Southeastern Pacific Ocean with Notes on R. natalensis (Opisthoproctidae)
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w Species of Rhynchohyalus from the Southeastern Pacific Ocean with Notes on R. natalensis (Opisthoproctidae) A. M. Prokofieva, b, * and E. I. Kukuevc aSevertsov
Institute of Ecology and Evolution, Russian Academy of Sciences (IEE RAS), Moscow, Russia Institute of Oceanology, Russian Academy of Sciences (IO RAS), Moscow, Russia c Atlantic Branch of the Russian Federal Research Institute of Fisheries and Oceanography – (AtlantNIRO), Kaliningrad, Russia *e-mail: [email protected] bShirshov
Received February 18, 2020; revised February 20, 2020; accepted February 20, 2020
Abstract—A new species Rhynchohyalus parbevs sp. nov. from the Southeast Pacific, which differs from R. natalensis in the greater number of gill rakers, the relative position of the fins, and the absence of pigmentation of the adipose fin. Based on our own and literature data, the variability of a number of diagnostically significant characters in R. natalensis was discussed. The capture of this species in the Indian Ocean is reported for the first time. Keywords: barreleyes, Rhynchohyalus, variability, new species DOI: 10.1134/S0032945220040189
INTRODUCTION The genus Rhynchohyalus Barnard, 1925, considered monotypic to this point, was known for few captures in the Atlantic and Pacific Oceans. The type species was described under the name Hyalorhynchus natalensis from a single specimen from the Atlantic waters of South Africa (Table Bay) (Gilchrist and von Bonde, 1924), subsequently lost. For a second time, this species was also described by single specimen from the stomach of tuna from the waters of Madeira under the name Ophthalmopelton macropus (Maul, 1946). Later, rare findings of this species were made in various regions of the Atlantic Ocean (Bermuda and Bahamas, Sargasso Sea, Angular Rise, Newfoundland Basin, Azores and Canary Islands, western part of the Argentine Basin) (Gray, 1952; Cohen, 1964; Bertelsen et al., 1965; Alekseev et al., 1982; Kukuev, 1982; Trunov, 1997; Porteiro et al., 1999; Kukuev and Trunov, 2005; Hartel et al., 2008) and in the Pacific Ocean off the coast of Peru (Parin et al., 1973), off the Hawaiian Islands (Clarke and Wagner, 1976; Mundy, 2005), northeast of the Ogasawara Islands (Fujii, 1985; Aizawa, 2002) and in Southwestern Pacific off the coast of the East and South Australia and New Zealand (Paxton et al., 1989; Partridge et al., 2014; Stewart, 2015; Bray, 2020), as well as in the waters of New Caledonia (Rivaton et al., 1990; Fricke et al., 2011). The conspecificity of the Pacific specimens to the Atlantic ones was not convincingly proved by anyone. Our comparison of the Peruvian specimen, caught in the 4th cruise of the research vessel (R/V) Akademik Kurchatov, with fishes from other areas
revealed its significant differences, and therefore in this paper it is described as a new species for science. Representatives of this genus were not previously observed in the Indian Ocean, however, we found a specimen of this species in the collection of the IO RAS that was captured in the central part of the Indian O
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