Amphyginus Haliday, 1841

Schmidt, Joachim & Will, Kipling, 2020, A new subgenus for “ Acalathus ” advena (LeConte, 1846) and the challenge of defining Calathina based on morphological characters (Coleoptera, Carabidae Sphodrini), Zootaxa 4722 (4), pp. 326-338 : 331

Subgenus Amphyginus Haliday, 1841

Third antennomere without pubescence. Mentum tooth bifid. Pronotal laterobasal seta removed from side margin. Lateral bead of prosternal process present. Parascutellar seta present. Elytra glabrous, with 4-6 discal setae in the third interval; discal setae absent in the fifth and seventh intervals. Elytral microsculpture nearly isodiametric. Metepisternum elongated. Male protarsomeres not dilated. Lateral grooves present on metatarsomeres I-IV. Apical gonocoxite moderately elongated, slender, with two ensiform setae at external margin; sensory pit of apical gonocoxite well developed.Aedeagus left side up in repose; median lobe apical disc absent; apical hook of long paramere present; membranous lobe of short paramere present.