Synuchidius Apfelbeck, 1908

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 : 334

Subgenus Synuchidius Apfelbeck, 1908

Third antennomere without pubescence. Mentum tooth bifid. Pronotal laterobasal seta situated at margin. Lateral bead of prosternal process present. Parascutellar seta absent. Elytra glabrous, with two discal setae in the third interval; discal setae absent in the fifth and seventh intervals. Elytral microsculpture nearly isodiametric. Metepisternum short. Male protarsomeres dilated. Lateral grooves present on metatarsomeres I-IV. Apical gonocoxite short, robust, with one ensiform seta 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.