It is an elongated cylindrical fish, tapering slightly at both ends; the length is typically six to ten times the depth. As is typical of halfbeaks, the lower jaw is elongated less so in young fish while the upper jaw is short. There are many sharp teeth, and the dorsal surface of the head has a patch of enlarged scales. The dorsal fin has 14 to 16 soft rays and the anal fin has 15 to 17 soft rays, these two fins being of equivalent size and both being set far back near the caudal peduncle.
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From Jordan and Evermann. Drawing by H. Description— The most striking feature of this halfbeak and one which is enough of itself to mark it off from every other fish known from the Gulf of Maine, is the fact that while the lower jaw is very long, the upper jaw is short. Its dorsal 14 to 16 rays and anal 15 to 17 rays fins are situated far back and opposite each other, as in the silver gar, and are about equal in length and alike in outline. There are no detached finlets between them and the caudal fin.
The ventrals stand about midway between a point below the eye and the base of the caudal. The teeth are small and the scales are largest on the upper surface of the head. The beak is much shorter in young fish than it is in adults. Color— Translucent bottle green above with silvery tinge, each side with a narrow but well-defined silvery band running from the pectoral fin to the caudal fin, the sides darkest above and paler below this band.
The tip of the lower jaw is crimson in life, with a short filament, and three narrow dark streaks run along the middle of the back.
The forward parts of the dorsal and anal fins and the tips of the caudal fins are dusky. The lining of the belly is black.
Size— Adults are seldom more than 1 foot long. General range— Tropical and subtropical on both coasts of America and in the Gulf of Mexico; abundant off the South Atlantic United States, not uncommon northward to Cape Cod, and straying to the coast of Maine.
Occurrence in the Gulf of Maine— In our cool boreal waters the halfbeak is only a rare stray from the south, previously recorded only twice in the Gulf of Maine, i. Hodson; a third, taken in a trap at Sandwich, September 24 of the same year,[ 13 ] and several dozen taken in a pound net at Small Point, Maine, July , reported by Leslie Scattergood. Series, vol. One, indeed Euleptorhamphus velox , has been taken at Nantucket.
Its lower jaw is even longer and more slender than that of the halfbeak, its body is more flattened sidewise, and its pectoral fins are longer.
Hyporhamphus unifasciatus (Ranzani, 1841)