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Bonaparte [C. L.]
Lumpsuckers have a sucking disk composed of modified pelvic fin elements, short gill openings, no normal scales, and no head spines. They differ from their closest relatives the snailfishes (Liparidae) in having fewer vertebrae (23-29 versus 36-86), globose or nearly globose body, two short dorsal fins, and a short anal fin. Most lumpsuckers have spiny tubercles on the head and body. The number, structure, and arrangement of the tubercles are important taxonomic characters. First dorsal fin with 4-8 spines, second dorsal with 8-13 soft rays located opposite an anal fin with 7-13 soft rays. Dorsal and anal fins not confluent with caudal fin, a definite caudal peduncle present. Caudal fin large and slightly rounded. Pectoral fins with 19-29 rays, extending ventrally in front of pelvic disk. Nostrils tubular, two pairs. Cephalic lateral line canals well developed (occipital absent in <b><i>Aptocyclus </i></b> ); pores of operculomandibular canals extended externally as barbel-like tubes in some species. Trunk lateral line canal absent or short; superficial neuromasts, papillate in some species, present. Small, conical teeth on jaws arranged in a few rows or narrow bands. Gill opening entirely above pectoral fin base, except extending a little below upper corner of pectoral base in <b><i>Cyclopterus </i></b> . Branchiostegal rays 6. Swim bladder absent. Maximum lengths of 2 cm (less than 1 in) to 61 cm (24 in). Marine; most species benthic on continental shelf and upper slope. A few species are primarily pelagic in deeper waters. Some, maybe all, lumpsuckers spawn in shallow coastal waters, sometimes migrating hundreds of miles. After spawning, males guard the eggs. Diet in benthic environment includes polychaetes, crustaceans, and molluscs. Pelagic diet comprises slow-moving prey, mostly medusae and ctenophores. In what may be partly a defensive reaction, lumpsuckers inflate their bodies by swallowing air or water. <b><i>Cyclopterus lumpus </i></b> is the target of substantial fisheries in several western North Atlantic countries, which market roe as lumpfish caviar. Other species have no commercial value. Distributed in the Arctic Ocean and northern regions of the North Pacific and North Atlantic oceans. Most speciose in the North Pacific. Much work remains to be done on the taxonomy of the Cyclopteridae. The two most recent revisions of the family (Lindberg and Legeza 1955 [ref. 2785]$, Ueno 1970 [ref. 26199]), although still providing much critical information, are now largely outdated. The authors did not examine the types of most species, and owing to the lack of available material described some species from few specimens. For several years we have been studying cyclopterids from a wealth of accumulated museum specimens and freshly caught specimens, including type series, and in Mecklenburg et al. (2002 [ref. 25968]) summarized available descriptive information on the Bering Sea and eastern North Pacific species. In this checklist we present a classification reflecting our current thinking on the entire group. We provisionally treat 6 genera and 28 species as valid. Four species (<b><i>Cyclopteropsis inarmatus, C. popovi, C. lindbergi, Eumicrotremus phrynoides </i></b> ), or more, may be synonymous with other species. The distinction between <b><i>Cyclopteropsis </i></b> and <b><i>Eumicrotremus </i></b> is increasingly unclear. Redescription of some genera and species is necessary. Differences in appearance from juvenile to adult, which are not well documented for most species, are perhaps the greatest problem in identifying lumpsuckers. The appearance of inflated and uninflated specimens is so different it has caused confusion in taxonomy. Resolution of the status of several species is particularly problematic because the types have been lost, including specimens that were in the private collection of Prof. V. K. Soldatov in the Moscow College of Fisheries and disappeared after his death in 1941. Characters of potentially important taxonomic significance for Cyclopteridae have not been fully inves</i></b>
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