• Webster's Revised Unabridged Dictionary
    • n. pl Xenopterygii (Zoöl) A suborder of fishes including Gobiesox and allied genera. These fishes have soft-rayed fins, and a ventral sucker supported in front by the pectoral fins. They are destitute of scales.
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Century Dictionary and Cyclopedia
    • n xenopterygii A suborder of teleocephalous fishes, represented by the family Gobiesocidæ, and characterized by the development of a complicated suctorial organ in the pectoral region. The xenopterygians had usually been placed with the lump-fishes and snail-fishes, in consequence of their common possession of a sucking-disk, which, however, is formed differently in the present suborder, being chiefly developed from the skin of the breast, in connection with the ventral fins. They are mostly fishes of oblong or lengthened coniform shape, with scaleless skin and spineless fins, one posterior dorsal fin, more or less nearly opposite the anal, and the sucker either entire or divided. They are small fishes, most common in tropical and warm temperate seas between tide-marks, adherent to rocks. There are 10 genera and 25 or 30 species, as Gobiesox reticulatus, abundant in tide-pools on the Pacific coast of the United States.
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Webster's Revised Unabridged Dictionary
NL., from Gr. xe`nos strange + , dim. of a wing