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The halfbeaks are elongate, streamlined fish adapted to living in open water. Halfbeaks range in size from 4 centimeters (1.6 in) standard length in Hemirhamphodon tengah to over 40 centimeters (15.7 in) in the case of Euleptorhampus viridis. The scales are relatively large, cycloid (smooth), and easily detached. There are no spines in the fins.A distinguishing characteristic is that the third pair of upper pharyngeal bones are anklylosed (fused) into a plate. Halfbeaks are one of several fish families that lack a stomach, all of which possess a pharyngeal jaw apparatus.
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