Orthoporus is a genus of spirostreptid millipedes, containing around 80 species, distributed from the southern United States to Brazil and Argentina. - Orthoporus absconsus Chamberlin, 1922 - Orthoporus acanthethus Chamberlin, 1947 - Orthoporus ampussis (Karsch, 1881) - Orthoporus araguayensis Schubart, 1947 - Orthoporus asper (Attems, 1950) - Orthoporus bidens Schubart, 1945 - Orthoporus bisulcatus Chamberlin, 1952 - Orthoporus bobos Chamberlin, 1952 - Orthoporus boreus Chamberlin, 1947 - Orthoporus brasiliensis Schubart, 1947 - Orthoporus caelatus Loomis, 1936 - Orthoporus canalis (Chamberlin, 1925) - Orthoporus capucinus (Attems, 1950) - Orthoporus cayennophilus (Silvestri, 1897) - Orthoporus chihuanus Chamberlin, 1947 - Orthoporus chiriquensis Pocock, 1909 - Orthoporus cienegonus Chamberlin, 1952 - Orthoporus clavicollis (Karsch, 1881) - Orthoporus cluniculus (Humbert & Saussure, 1870) - Orthoporus cobanus Chamberlin, 1922 - Orthoporus comminutus (Attems, 1950) - Orthoporus conifer (Attems, 1950) - Orthoporus cordovanus Pocock, 1909 - Orthoporus diaporoides Silvestri, 1897 - Orthoporus discriminans Chamberlin, 1922 - Orthoporus dybasi (Chamberlin, 1952) - Orthoporus esperanzae Chamberlin, 1943 - Orthoporus etholax Chamberlin, 1923 - Orthoporus euthus Chamberlin, 1952 - Orthoporus extensus Loomis, 1966 - Orthoporus festae (Silvestri, 1896) - Orthoporus flavior Chamberlin & Mulaik, 1941 - Orthoporus foliatus Chamberlin, 1923 - Orthoporus fraternus (Saussure, 1860) - Orthoporus gaigei Chamberlin, 1923 - Orthoporus gracilior Chamberlin, 1952 - Orthoporus guerreronus (Chamberlin, 1942) - Orthoporus haitiensis Chamberlin, 1918 - Orthoporus heterogona Silvestri, 1902 - Orthoporus hoctunicolens Chamberlin, 1938 - Orthoporus kiemi Loomis, 1962 - Orthoporus leius Chamberlin, 1943 - Orthoporus leonicus Chamberlin, 1941 - Orthoporus lomonti Brölemann, 1932 - Orthoporus luchilicolens Chamberlin, 1938 - Orthoporus margarites (Chamberlin, 1946) - Orthoporus mimus Chamberlin, 1943 - Orthoporus montezumae (Saussure, 1859) - Orthoporus mundus Chamberlin, 1942 - Orthoporus nesiotes Chamberlin, 1923 - Orthoporus nodosus Loomis, 1974 - Orthoporus omalopage (Brölemann, 1905) - Orthoporus ornatus (Girard, 1853) - Orthoporus palmensis (Brölemann, 1905) - Orthoporus paxillicauda Loomis, 1962 - Orthoporus poculifer Silvestri, 1897 - Orthoporus punctatissimus Silvestri, 1897 - Orthoporus reimoseri (Attems, 1950) - Orthoporus rodriguezi (Brölemann, 1900) - Orthoporus rugiceps (Attems, 1950) - Orthoporus salvadoricus (Kraus, 1954) - Orthoporus sanctus Chamberlin, 1947 - Orthoporus sculpturatus (Karsch, 1881) - Orthoporus solicolens Chamberlin, 1938 - Orthoporus striatulus Pocock, 1909 - Orthoporus tabulinus Attems, 1914 - Orthoporus teapensis Pocock, 1909 - Orthoporus tehuacanus Chamberlin, 1952 - Orthoporus texicolens Chamberlin, 1938 - Orthoporus tizamensis Chamberlin, 1938 - Orthoporus torreonus Chamberlin, 1943 - Orthoporus triquetrus Loomis, 1936 - Orthoporus trisulcatus (Daday, 1889) - Orthoporus vialis Loomis, 1974 - Orthoporus walkeri Chamberlin, 1923 - Orthoporus zizicolens (Chamberlin, 1938)