original description
Dana, J.D. (1853 - 1855). Crustacea. Part II. <em>In: United States Exploring Expedition. During the years 1838, 1839, 1840, 1841, 1842. Under the command of Charles Wilkes. U. S. N., C. Sherman Printer, Philadelphia.</em> 14: 691-1618. [1855, folio atlas pls. 1-96.]. (look up in IMIS) [details] 
additional source
Sars, G.O. (1900). Crustacea. <em>In: Nansen, F. (ed.). The Norwegian North Polar Expedition 1893-1896., Scientific Results.</em> 1(5): 1-141, Plates 1-36., available online at https://www.biodiversitylibrary.org/page/17104697#page/9/mode/1up [details] 
From editor or global species database
Taxonomy Esterly, 1905 considered this a synonym of Centropages and place H. calaninus, gracilis and tenuicornis as Centropages [details]
From editor or global species database
Haloptilus longicornis from Sars, G.O. 1902
Image from typetaxon
Haloptilus longicornis from Sars, G.O. 1902
Image from typetaxon