Rakantrechus, S. Ueno, 1951
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publication ID |
https://doi.org/ 10.50826/bnmnszool.48.3_119 |
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persistent identifier |
https://treatment.plazi.org/id/A95B8783-390C-FFE1-FE61-FDEAFB0AC522 |
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treatment provided by |
Felipe |
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scientific name |
Rakantrechus |
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Key to the Subgenera of Rakantrechus View in CoL
1. Elytral stria 5 with a single discal setae, and stria 3 (or interval 4) with two discal setae (apart from preapical setae); labial suture entirely visible ( Figs. 2a–c View Fig ) .................................................................2
— Elytral stria 5 with two discal setae, and stria 3 with 1–3 discal setae (apart from preapical setae); labial suture in varied condition, sometimes nearly vanished ( Fig. 2d View Fig ); genae either pubescent or glabrous (the latter case occurs only in species of the nomurai View in CoL -group); posterior latero-marginal setae of pronotum either present or absent (the latter case occurs in one species of the nomurai View in CoL - group; Fig. 5d View Fig ); pronotum, prosternum, and elytral intervals always completely glabrous (apart from fixed setae); inclined face of elytral basal peduncle variable from distinctly defined to not separately defined ( Figs. 5d–f View Fig ), but always distinctly defined in species of the nomurai View in CoL -group ( Figs. 3e View Fig , 5d View Fig ); male endophallus with or without copulatory piece ........Subgen. Paratrechiama S. Uéno, 1959
2. Genae pubescent; posterior latero-marginal setae of pronotum present ( Figs. 5a, c View Fig ) .........................3
— Genae glabrous; posterior latero-marginal setae of pronotum absent; inclined face of elytral basal peduncle distinct, flat ( Fig. 5b View Fig ); basal part of elytral disc moderately depressed; male endophallus without copulatory piece .................................................. Subgen. Iyotrechus S. Uéno et Naitô, 2009 View in CoL
3. Intervals of elytra glabrous; pronotum and prosternum glabrous or only with paramedian setae ......4
— Intervals of elytra pubescent; pronotum and prosternum widely pubescent at least in posterior half ( Fig. 2f View Fig ); ventrites 4–6 with a row of 4–7 apical setae among which one or two pairs of paramedian setae are mingled ( Fig. 2 g View Fig ); male endophallus with a large copulatory piece .............................................................................................. Subgen. Pilosotrechiama S. Uéno, 1958
4. Pore 1 (and 3, 4) of marginal umbilicate series of elytra obviously translocated dorsad ( Fig. 3h View Fig ); ventrite 3 with a few central setae, ventrites 4–6 each with a row of 4–7 hairs ( Fig. 2h View Fig ); in right mandible, median cusp of the tricuspid retinacular tooth (which is supposedly formed by the union of premolar and primarily bicuspid retinaculum) strongly reduced ( Fig. 1g View Fig ); mentum tooth slightly emarginate, or very slightly cleft at apex ( Fig. 2b View Fig ); hind angles of pronotum subrectangular, not posteriorly produced; inclined face of elytral basal peduncle not separately defined, continuous to the slope of elytral disc ( Fig. 3h View Fig ); male endophllus with a copulatory piece; highly depigmented; size smaller, not more than 3.50 mm ................................................Subgen. Rakantrechus S. Uéno, 1951 View in CoL
— Pore 1 (and 3, 4) of marginal umbilicate series of elytra more or less removed from marginal gutter, but more weakly so than the above entry ( Figs. 5a, c View Fig ); ventrite 3 without central setae ( Figs. 2i–j View Fig ); in right mandible, median cusp of the tricuspid retinacular tooth (which is supposedly formed by the union of premolar and primarily bicuspid retinaculum) small but distinct in intact specimens ( Figs. 1d, f View Fig ); mentum tooth with apex simply rounded or pointed ( Fig. 2a View Fig ); hind angles of pronotum latero-posteriorly produced; inclined face of elytral basal peduncle usually distinct, more steeply declivous than the sloping angle of elytral disc ( Figs. 5a, c View Fig ); less depigmented than above entry; size larger, not less than 3.55 mm ...............................................................................................................5
5. Basal portion of elytral intervals 2–6 less distinctly depressed than the below entry ( Fig. 5c View Fig ); ventrites 4–6 each with one or two pairs of paramedian setae ( Fig. 2i View Fig ); aedeagal apical lobe deflexed, shorter (than the below entry), truncate at apex; male endophllus with a large copulatory piece; size smaller, not more than 4.00 mm ........................................................Subgen. Izushites S. Uéno, 1982
— Basal portion of elytral intervals 2–6 more distinctly depressed than the above entry, ( Fig. 5a View Fig ); ventrites 4–6 each only with a pair of paramedian setae ( Fig. 2j View Fig ); aedeagal apical lobe reflexed, longer and slenderer (than the above entry,), pointed at apex; male endophllus with or without copulatory piece which is smaller than the above entry, if present; size larger, not less than 4.20 mm .................................................................................................Subgen. Uozumitrechus S. Uéno, 1958
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