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Lampridiformes : ウィキペディア英語版
Lampriformes

Lampriformes is an order of ray-finned fish. Members are collectively called lamprids (which is more properly used for the Lampridae) or lampriforms, and unite such open-ocean and partially deep-sea Teleostei as the crestfishes, oarfish, opahs, and ribbonfishes. A synonym for this order is Allotriognathi, while an often-seen, but apparently incorrect, spelling variant is Lampridiformes. They contain seven extant families which are generally small but highly distinct, and a mere 12 lampriform genera with some 20 species altogether are recognized.〔Nelson (2006): pp.226,228〕
The scientific name literally means "shaped (like the) bright (one)", as "lampr-", meaning bright, comes from ''lampris'', the generic name for the opah. In contrast, most other living lampriforms are actually ribbon-like and not very similar to the disc-shaped opahs in habitus. They are, however, quite distinctly united by their anatomy, and the family's phylogeny, as well as the most ancient fossils of this order suggest the original lampriform was rather "opah-shaped". The scientific name is a combination of ''Lampris'' (the type genus) + the standard fish order suffix "-formes". It ultimately derives from Ancient Greek ''lamprós'' (λαμπρός, "bright") + Latin ''forma'' ("external form"), the former in reference to brilliant coloration of opahs.〔Woodhouse (1910), Glare (1968-1982), FishBase (2006), Nelson (2006): pp.226-230〕
==Description and ecology==

These oceanic fishes are pelagic feeders that stay well above the sea floor, and normally occur in waters 100–1000 m deep. They are typically brightly coloured as adults, often with brilliant crimson fins. Lampriforms have highly variable body forms, but they are generally laterally compressed. Some are rounded in lateral view, while others are very elongated. The former are termed bathysomes – "deep-bodies", from Ancient Greek ''bathýs'' (βᾶθύς) "deep" + ''sōma'' (σῶμα) "body" – and the latter taeniosomes – "ribbon-bodies", Greek ''tainía'' (ταινία) "ribbon". They vary greatly in size, too, ranging from less than in the sailfin moonfishes (Veliferidae) to ''Regalecus glesne'', the longest of all living bony fishes, which may reach in length.〔Woodhouse (1910), Olney (1998), Nelson (2006): p.226〕
The lampriforms have 84-96 total vertebrae; an orbitosphenoid bone is present in some members of this order. Their premaxilla completely excludes the maxilla from the gape, but the jaws are highly protrusible, nonetheless. The upper jaw's protrusion is achieved in a unique way: the maxilla, instead of being ligamentously attached to the ethmoid and palatine, slides in and out with the highly protractile premaxilla. The pelvic fins have up to 17 rays and are placed rather far toward the front of the animal, but they can be missing entirely. The dorsal fin is long, and tends to extend along most of the length of the body. Fin spines are absent in all. Some have a physoclistous gas bladder, while others have none. They either have tiny scales or naked skin.〔Olney (1998), Nelson (2006): p.226〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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