Taxonomic revision of the genus Ectamenognonus Buysson (Coleoptera, Elateridae, Elaterinae) from Japan Author Arimoto, Kôichi text Zootaxa 2022 2022-01-06 5087 2 306 334 journal article 2759 10.11646/zootaxa.5087.2.4 7886e4d1-ce99-4dc0-b445-f03e4d06df3d 1175-5326 5824232 701019E0-F757-40E9-A54D-F936DBE0BCC7 Key to species of the genus Ectamenogonus from Japan 1. Body slender (EI:>2.3, BI:>1.9) ( Fig. 1A ). Spiculum ventrale 3.6–4.2 x longer than sternite VIII. Ovipositor 1.2–1.3 x longer than length of midline of abdominal ventrites............................................................... 2 - Body robust (EI: <2.3, BI: <1.9) ( Fig. 1B–G ). Spiculum ventrale 2.5 x longer than sternite VIII. Ovipositor 0.9 x longer than length of midline of abdominal ventrites................................................ E . matobai ( Kishii, 1973 ) 2. Antennomere IV 1.1–1.5 x longer than II–III combined ( Figs. 5D , 8D ). Prothorax somewhat slender (PI: 109–121) ( Fig. 1B–E ). Aedeagus slender (3.6–4.3 times longer than wide) ( Figs. 6E, F , 11E, F ). Median lobe exceeding apices of parameres by apical 1/4 to 1/3 ( Figs. 6E, F , 11E, F ). Paramere apex length 1.9–2.2 x width of parameres at expansions ( Figs. 6G , 11G ). Bursa copulatrix long (1.7–2.7 times length of uterus), with two clusters of sclerotized spines ( Figs. 7A , 13A )........... 3 - Antennomere IV 0.9–1.1 x longer than II–III combined ( Fig. 14D ). Prothorax somewhat robust (PI: 101–111) ( Fig. 1F, G ). Aedeagus robust (3.3 times longer than wide) ( Fig. 16E, F ). Median lobe exceeding apices of parameres by apical 1/5 to 1/4 ( Fig. 16E, F ). Paramere apex length 1.3–1.8 x width of parameres at expansions ( Fig. 16G ). Bursa copulatrix short (1.0–1.1 times length of uterus), with a cluster of sclerotized spines ( Fig. 18E )........................ E . robustus ( Kishii, 1966 ) 3. Antennae just reaching or extending beyond pronotum posterior lateral apices by apical antennomere in male ( Fig. 10B–D ). Posterior edge of scutellar shield rounded but truncate in some ( Fig. 8G ). Elytra 2.0–2.2 times longer than pronotum length (BI: 202–229) ( Fig. 1D, E ). Bursa copulatrix shorter (1.7–2.3 times length of uterus) ( Fig. 13A )..... E . plebejus ( Candèze, 1873 ) - Antennae not reaching pronotum posterior lateral apices by apical antennomere in male ( Fig. 10A ). Posterior edge of scutellar shield emarginate medially ( Fig. 5G : arrow). Elytra 1.9–2.0 times longer than pronotum length (BI: 191–199) ( Fig. 1B, C ). Bursa copulatrix longer (2.4–2.7 times length of uterus) ( Fig. 7A )........................ E . miyakoensis Arimoto sp. n.