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Like other needlefish, the Atlantic needlefish has a long, thin, needle-like beak formed by its upper and lower jaws. Both of its jaws are lined with tiny, sharp teeth. This needlefish differs from other needlefish in that its caudal, or tail, fin is bluish and the lower half of its beak is pale.

The Atlantic saury is one of the four most common sauries. Although sauries are closely related to halfbeaks, ricefish, flying fish, and needlefish, the Atlantic saury comes closest to resembling a halfbeak. One of the main identifying marks on the Atlantic saury, which set it apart from halfbeaks, are the finlets, or tiny fins, between this fish's dorsal and caudal fins.