Sentence:  The <WSD>Remoræ</WSD> ("Echeneisidæ") form the last family of the soft-finned, subbrachian fishes. They are characterized at once by the top of their heads being flattened, and furnished with transverse series of cartilaginous plates, somewhat similar to the plates under the toes of the Gecko, by which these fish attach themselves to ships, rocks, and marine bodies. 
Meaning of the word marked with <WSD> tags:  Any of various elongate fish from the family Echeneidae, the dorsal fin of which is in the form of a suction disc that can take a firm hold against the skin of larger marine animals. (from mid 16th c.)