虫頭

Wednesday, June 07, 2017

イッカククワガタ（Sinodendron rugosum Lucanidae) Rugose Stag Beetle　

17mm

12mm
ハンノキ


  • 060417 cf sm ca 午後4時 気温は80F以上で”夏の夕方”風。♂はトレイル脇の川沿いのハンノキ（"White Alder" : Alnus rhombifolia）に飛翔。♀は駐車場への坂道途中に落下。
  • 060517 フジリンゴの皮を与えているが食餌を確認出来ず。
  • 060617 交尾確認。
  • 060717 青りんご二日目。食餌した様子が確認出来ていない。
  • 061717 cf sm ca 午後４時〜５時。93f h23%　トレイル　水没した朽木にしがみついたまま半死状態の♂、水没を免れた朽木にしがみつく♂、川沿いのハンノキで静止していた♂。この時期であれば材割不要。そもそもアブが多く、材割などしていたら刺されまくってしまう。養蜂家のような出で立ちでなければ無理だろう。
  • ビークワ23春号（2007）112 - 113頁によれば、本種は後食をしないとの記述あり。
  • ひらたけ（）の栽培セットをばらして、自作菌糸瓶の可能性はあるのだろうか。あるいはOyster Mushrrom栽培の原木を入手する方法はないだろうか。要検討。
  • Eastern forest insects（Whiteford Lee著, no.1175, 1972年 145頁）に記載ある３種類の木（ハンノキ、柳、ポプラ（コットンウッド））を判別できるようになる必要あり。さらに、それらの朽木についても同様。
  • 仮にイッカククワガタがプレートテクトニクス理論を支える証拠になるのであれば、北米大陸とユーラシア大陸が完全に分離したといわれる8000万年前～7000万年前よりも前から存在していたことになる。虫友Tはプレートテクトニクス理論を信じないと言っていたが、そこまで言い切る理由があるとすればなんだろう。話のタネにぶつけてみること。あと、本種が北米では西海岸でしか確認されていないことも興味深い。なぜだろう。
参考url:

参考文献：
THE PAN-PACIFIC ENTOMOLOGIST [VOL. IV, NO.4 175p-176p

 THE SPECIES OF SINODENDRON (LUCANIDAE) 

 BY MELVILLE H. HATCH* 

 Sinodendron is one of those genera that seem to unite the Pacific coast of North America more closely with the Palaearctic region than with other portions of North America. The three species of this genus are known respectively from Europe, the North American Pacific Coast, and Azerbaijan and Trans-Caspia. The larvae inhabit the decaying wood of the dead and dying trunks, stumps, and logs of various deciduous trees (alder, beech, ash, willow, etc.), but do not appear to injure the living tree. In the following key the characters of persicum are drawn from the original description. 

 A1 Elytral intervals coarsely punctate; ♂ with transverse pronotal ridge emarginate on either side of median lobe. 

 B1 Elytral intervals less coarsely punctate. Male: cephalic horn feebly constricted at base; pronotum less coarsely punctate, with large lateral areas caudad to the trans- 
verse ridge and the middle line impunctate; lateral protuberances of transverse pronotal ridge less prominent but about equal in width to the median lobe; transverse 
ridge terminating at anterior angles of pronotum, the sides of the pronotum in front feebly convergent with an evident longitudinal impression. Female: pronotum 
with conspicuous raised impunctate transverse and longitudinal areas. Europe and adjacent portions of
Asia, Caucasus, (americanum Beauv., juvenile Muls.) ……………………….cylindricum L. 

 B.2 Elytral intervals less coarsely punctate. Male: cephalic horn not constricted at base, gradually narrowed from base to apex; pronotum more coarsely punctate, without 
evidence of impunctate areas in front of transverse ridge and only feebly developed impunctate areas behind the ridge; lateral protuberances of transverse ridge minute; transverse ridge terminating at the side margin of the pronotum well behind apex, the sides of the pronotum in front strongly convergent with a feeble impression behind the ridge. Female: pronotum without transverse impunctate spaces. California to Washington ………………………….rugosum Mann. 

 A.2 Elytral intervals broad, almost impunctate except at apex. Male: transverse pronotal ridge not emarginate on either side of base of median lobe; cephalic horn strongly constricted at base; pronotum without impunctate area in front of transverse ridge, behind the ridge an extensive impunctate area attaining the sides but not the base, the sides without impressed area. Female: pronotum with transverse impunctate areas. Azerbaijan (Talysh) and Trans-Caspia (Kopeh Dagh) ……………………persicum Reitt. 

 * Contribution from the Zoological Laboratory of the University of Washington.
幼虫


posted by erc @ 6:55 PM

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