Ectamenogonus matobai ( Kishii, 1973 )

Arimoto, Kôichi, 2022, Taxonomic revision of the genus Ectamenognonus Buysson (Coleoptera, Elateridae, Elaterinae) from Japan, Zootaxa 5087 (2), pp. 306-334 : 309-311

publication ID	https://doi.org/ 10.11646/zootaxa.5087.2.4
publication LSID	lsid:zoobank.org:pub:701019E0-F757-40E9-A54D-F936DBE0BCC7
DOI	https://doi.org/10.5281/zenodo.5824228
persistent identifier	https://treatment.plazi.org/id/03D1A92A-FFAC-FFCA-3085-159AFD70EA94
treatment provided by	Plazi
scientific name	Ectamenogonus matobai ( Kishii, 1973 )
status

Treatment

Ectamenogonus matobai ( Kishii, 1973)

( Figures 1A View FIGURE 1 , 3 View FIGURE 3 , 4 View FIGURE 4 )

Penthelater matobai Kishii, 1973: 12 (original description; type locality: Japan, Okinawa Prefecture, Ishigaki City ( Ishigaki Island )).

Ectamenogonus matobai ( Kishii, 1973) ; Kishii, 1999: 56 (change generic status) [partim].

Type material. Holotype. Female [5636], Japan, Okinawa Prefecture, Ishigaki City ( Ishigaki Island ), 14 VI 1971, Isao Matoba leg. Verbatim label data ( Fig. 4A View FIGURE 4 ). “ HOLOTYPE ”; “ ♀ ”; “5636”; “ISHIGAKI City/ Ishigaki Is./ 14- VII-1971 / Leg. I. Matoba ”; “ Penthelater / matobai/ Kishii (Ms)/ Det. T. KISHII. 1972”.

Female. Diagnosis. Antennomere IV 1.3 x longer than II– III combined. Prothorax 1.2 x longer than wide. Posterior edge of scutellar shield almost truncate but slight emarginate medially. Elytra 2.2 x longer than wide, 1.8 x longer than pronotum length. Spiculum ventrale 2.5 x longer than sternite VIII. Ovipositor 0.9 x longer than length of midline of abdominal ventrites. Bursa copulatrix 2.1 x length of uterus, with two clusters of sclerotized spines.

Measurements. BL: 12.9, BW: 3.79, MAE: 2.14, MBE: 1.32; OI: 162, PL: 4.44, PML: 3.72, PW: 3.79, PI: 117, EL: 8.10, EW: 3.65, EI: 222, BI: 183.

Redescription. Body widest near pronotum hind angles; surface with microstructures; interspaces between punctures generally as long as puncture diameter but partly smaller than puncture diameter; frons, hypomeron, scutellar shield and abdomen interspaces between punctures larger than puncture diameter ( Fig. 3A, B, G, H View FIGURE 3 ). Color. Body brown ( Fig. 1A View FIGURE 1 ). Labrum red-brown ( Fig. 3C View FIGURE 3 ). Antennae orange ( Fig. 1A View FIGURE 1 ). Mandible red-brown ( Fig. 3C View FIGURE 3 ). Maxillary palpomeres orange ( Fig. 3C View FIGURE 3 ). Prosternum and hypomeron red-brown ( Fig. 3A View FIGURE 3 ). Elytra around striae blackish ( Fig. 1A View FIGURE 1 ). Legs orange ( Fig. 3A View FIGURE 3 ). Abdomen becoming paler apicad ( Fig. 3A View FIGURE 3 ). Tergites and sternites VIII red-brown ( Fig. 4C View FIGURE 4 ). Body covered with orange to red-brown setae ( Figs. 1A View FIGURE 1 , 3A View FIGURE 3 ).

Head. Frons beyond eyes 0.3 x longer than wide ( Fig. 3B View FIGURE 3 ); supra-antennal carina in ventral view weakly emarginate but almost straight medially ( Fig. 3C View FIGURE 3 ). Antennae not reaching pronotum posterior margin excluding posterior angles by apical antennomere ( Fig. 1A View FIGURE 1 ); II 1.1 x longer than wide; III 1.2 x longer than wide; IV 2.2 x longer than wide, 1.3 x longer than II–III combined ( Fig. 3D View FIGURE 3 ), 1.1 x longer than V; V 1.9 x longer than wide; XI 2.7 x longer than wide ( Fig. 3E View FIGURE 3 ).

Prothorax 1.2 x longer than wide, widening posteriad, widest behind hind angles ( Fig. 1A View FIGURE 1 ); sides rounded in anterior half, straight in posterior half. Pronotum without median longitudinal depression. Prosternum: ventral margin roundly inclined in anterior 1/3 ( Fig. 3F View FIGURE 3 ); anterior lobe just reaching anterior angles of prothorax ( Fig. 3F View FIGURE 3 ). Prosternal process without depression between procoxae ( Fig. 3H View FIGURE 3 ); side of dorsal lobe widening posteriad, widest near anterior half and then concavely narrowed ( Fig. 3A View FIGURE 3 ); ventral margin of ventral lobe in profile straightly inclined and then broadly convex in posterior half ( Fig. 3F View FIGURE 3 ); apex in ventral and lateral views rounded ( Fig. 3A, F View FIGURE 3 ). Hypomeron slightly grooved next to impunctate ridge ( Fig. 3H View FIGURE 3 : white arrow); posterior margin with angle near mesial projection ( Fig. 3H View FIGURE 3 : black arrow). Pronotosternal sutures moderately opened anteriorly ( Fig. 3H View FIGURE 3 ). Scutellar shield 1.6 x longer than wide ( Fig. 3G View FIGURE 3 ), widest near anterior half, convex, strongly inclined anterior-downwards, not visible in profile ( Fig. 3F View FIGURE 3 ); anterior edge broadly rounded; sides broadly rounded anteriorly; posterior edge almost truncate but slight emarginate medially ( Fig. 3G View FIGURE 3 : arrow). Mesosternum: posterior edge 0.1 x wider than mesosternum width, triangularly emarginate ( Fig. 3I View FIGURE 3 : arrow), with widely rounded angles; borders of mesosternal cavity in profile horizontal and then abruptly inclined ( Fig. 3F View FIGURE 3 ). Elytra 2.2 x longer than wide, 1.8 x longer than pronotum length; apex emarginate; apical outer edge of each elytron rounded; apical internal edges of each elytron slightly pointed or rounded (likely due to damage) ( Fig. 3J View FIGURE 3 ).

Abdomen. Ventrite V 0.6 x longer than wide ( Fig. 3A View FIGURE 3 ). Tergite VIII 1.3 x longer than wide ( Fig. 4D View FIGURE 4 ). Sternite VIII 1.0 x longer than wide ( Fig. 4E View FIGURE 4 ); spiculum ventrale 2.5 x longer than sternite VIII ( Fig. 4C View FIGURE 4 ). Ovipositor 0.9 x longer than length of midline of abdominal ventrites; coxites two segmented at ventral side ( Fig. 4H View FIGURE 4 ; indistinct due to press of glass), with some setae; stylus with setae around apex ( Fig. 4G View FIGURE 4 ). Vagina long; uterus globular ( Fig. 4C View FIGURE 4 ); bursa copulatrix U-shaped, long, 2.1 x length of uterus, with 78 sclerotized spines, of which 29 spines forming cluster in first half and 49 spines forming rows in latter half ( Fig. 4F View FIGURE 4 ); long thin sac extending from apex of bursa copulatrix ( Fig. 4C View FIGURE 4 ), with coiled sac near apex of bursa copulatrix ( Fig. 4F View FIGURE 4 ).

Male. Unknown.

Comparative notes. Ectamenogonus matobai is distinguished from the Japanese congeners by the robust body (the other species in parentheses): elytra>2.3 x longer than wide, EI: 222 (elytra <2.3 x longer than wide, EI: 235– 260); elytra>1.9 x length of pronotum, BI: 182 (elytra <1.9 x length of pronotum, BI: 191–255); spiculum ventrale 2.5 x longer than sternite VIII (spiculum ventrale 3.6–4.1 x longer than sternite VIII); ovipositor 0.9 x longer than length of midline of abdominal ventrites (ovipositor 1.2–1.3 x longer than length of midline of abdominal ventrites).

Distribution ( Fig. 20B View FIGURE 20 ). Japan: Yaeyama Islands of the Ryukyu Islands (Ishigaki Island). Taiwan ( Schimmel, 2003).

Kishii (1999) included the Kume, Ishigaki, and Iriomote Islands in the range of E. matobai . Kishii (2004a) stated that the species from Kume and Ishigaki islands is not E. matobai , but he did not give detailed information on the specimens mentioned; this study did not find the specimens that were evidence of the distribution in Kishii (1999, 2004a). In this study, E. matobai is treated to be only from the holotype from Ishigaki Island, and the species from Kume Island was determined to be E. plebejus (see discussion of E. plebejus ).

Ecology. There is no ecological information.