Geographic Variation in the Central Pacific Halfbeak, Hyporhamphus acutus (Gunther)
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1974-04
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University of Hawai'i Press
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Abstract
Hyporhamphus acutus (Gunther) is distinguished from other Central
Pacific species of Hyporhamphus by its long upper jaw, long anal fin base (longer than
dorsal base), and shape of its preorbital lateral line canal. Two subspecies are
recognized: Hyporhamphus acutus acutus (Gunther) with fewer vertebrae and fin rays
inhabits the chain of islands from Wake Island and the Marshall Islands in the
northwest to the Tuamotu Archipelago and Easter Island in the southeast;
Hyporhamphus acutus paciftcus (Steindachner) with more vertebrae and fin rays is
found in the Hawaiian Islands and at Johnston Island. Hemiramphus furcatus
Philippi from Easter Island and Odontorhamphus chancellori Weed from the Cook
Islands are placed in the synonymy of Hyporhamphus acutus acutus.
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Collette BB. 1974. Geographic variation in the Central Pacific halfbeak, Hyporhamphus acutus (Gunther). Pac Sci 28(2): 111-122.
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