title: A new species of halfbeak, Hyporhamphus naos (Beloniformes: Hemiramphidae), from the tropical eastern Pacific.
abstract: The tropical eastern Pacific halfbeak previously considered conspecific with the western Atlantic Hyporhamphus unifasciatus (Ranzani 1842) is described as a new species, H. naos. It resembles H. meeki from the Atlantic and Gulf coasts of the United States in number of gill rakers on the first arch (usually 32-36, mean 33.6), more than in H. unifasciatus (usually 29-32, mean 30.6), but fewer than in other sympatric species of eastern Pacific Hyporhamphus. Results of a three-treatment ANCOVA (H. naos, H. meeki, and H. unifasciatus) show significant differences in slopes and means for all 14 morphometric characters examined, 9 of 14 characters comparing H. naos with H. unifasciatus, and 7 of 14 comparing H. naos with H. meeki. Protein electrophoretic patterns clearly distinguish all three species with a number of fixed allelic differences.
authors.affiliation: National Marine Fisheries Service Systematics Laboratory, National Museum of Natural History, Washington, DC 20560-0153, USA. hb2@axe.humboldt.edu
authors.forename: H M
authors.initials: HM
authors.lastname: Banford
authors.forename: B B
authors.initials: BB
authors.lastname: Collette
mesh_terms: D000483:Alleles; D000704:Analysis of Variance; D000818:Animals; D023761:Beloniformes / Q000145:classification* / Q000235:genetics; D004586:Electrophoresis; D010140:Pacific Ocean; D011506:Proteins / Q000032:analysis
chemical_list: D011506:Proteins