單軍生,任國棟
(河北大學(xué) 生命科學(xué)學(xué)院,河北省動物系統(tǒng)學(xué)與應(yīng)用重點(diǎn)實(shí)驗(yàn)室,河北 保定 071002)
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中國喜馬拉雅山寬額甲屬2新種記述(鞘翅目:擬步甲科)
單軍生,任國棟
(河北大學(xué) 生命科學(xué)學(xué)院,河北省動物系統(tǒng)學(xué)與應(yīng)用重點(diǎn)實(shí)驗(yàn)室,河北 保定071002)
寬額甲屬AscelosodisRedtenbacher,1868是青藏高原喜馬拉雅地區(qū)的1個特有類群,迄今已記錄25個物種.本文報道來自西藏的2個新種,分別是直緣寬額甲A.rectussp.nov.和聶拉木寬額甲A.nyalamensissp.nov.,并給出2新種的形態(tài)特征描述、形態(tài)特征圖及其與近緣種的示差鑒別.
鞘翅目;擬步甲科;寬額甲屬;新種;西藏
Ascelosodis rectus sp.nov.(Figs.1,2)
The new species resemblesAscelosodisschmidiKaszab,1965,with the following differences:anterior margin of clypeal lobe weakly sinuate;genae gradually wider before eyes;pronotum with anterior angles obtuse,rounded apically and with anterior margin shortly prominent in the middle;the fifth abdomen extending the end straight.
Etymology:Named after the fifth abdomen extending the end straight.
Holotype:♂,China,Tibet,Lhazê,Cuola Mountain,28°53.959′N,87°25.182′E;alt.5 064 m,2 August 2011,collected by Ren Guodong.Paratypes:16♂27♀,same data as the holotype.
Ascelosodis nyalamensis sp.nov.(Figs.3,4)
The new species resemblesA.emarginataRen & Shi,2006,with the following differences:Sides of prothorax and elytra with very sparsely ciliate beneath;pronotal surface with coarse punctures,slightly denser on disc than on sides and rugae between disc and sides;elytra base with obscure but finely entire bordered;Elytra surface with sparsely and obscurely shallow punctures.
Etymology:Named after the type locality.
Holotype:♂,China,Tibet,Nyalam,Mainpu,Tulong,28°25.841′N,86°08.840′E,Alt.4 478 m,30 July 2014,collected by Ren Guodong.Paratypes:1♂3♀,collected by Ren Guodong,Bai Xinglong and Shan Junsheng,same data as the holotype.
寬額甲屬AscelosodisRedtenbacher,1868[1]的分類體系幾經(jīng)變動,最初被放在鱉甲族Tentyriini[2-3];隨后Doyen[4]根據(jù)雌性生殖管(internal female tract)和交合刺(spiculum)等特征將其移入Eurymetopini Casey,1907[5],L?bl et al.[6]最新記錄其為鱉甲族Tentyriini.迄今該屬全球記錄25種(Redtenbacher(1868)1種,Bates(1879)6種,Blair(1923)5種,Koch(1943,1948)2種,(1959,1965,1968)3種,Kaszab et al.(1978)1種,Ren & Shi(2006,2007)6種[1,7-21]),已知分布東至中國西藏朗縣,西至阿富汗,南至喜馬拉雅山脈,北至新疆南緣.該屬中國已知20種(含本文新種),主要分布于中國西藏.作者在整理該地區(qū)該屬標(biāo)本時,從中發(fā)現(xiàn)2個至今尚未報道的物種,分別是直緣寬額甲A.rectussp.nov.和聶拉木寬額甲A.nyalamensissp.nov.模式標(biāo)本保存于河北大學(xué)博物館.
研究標(biāo)本采自中國西藏地區(qū),保存于河北大學(xué)博物館.標(biāo)本由Nikon SMZ800鑒定,并用Leica M205A stereomicroscope 進(jìn)行拍照并測量,后期用Adobe Photoshop CS6 進(jìn)行圖片處理.生殖器及第Ⅷ背、腹板均用甘油保存.
2.1直緣寬額甲,新種Ascelosodis rectus sp.nov.(圖1,2)
體卵圓形,黑色,具弱光澤,體下、觸角、上唇、口須及足棕黑色.身體側(cè)緣被稀疏長毛.
雄性(圖1a~d,g~j):唇基寬短,前緣弧凹,略長過頰側(cè)葉,額唇基溝淺凹;前頰弱弧形,于眼前逐漸擴(kuò)展,近基部為頭部最寬處.復(fù)眼被頰深切.頭頂隆起,布稀疏淺小刻點(diǎn),向四周變?yōu)槌砻芎烷L圓形,唇基端部刻點(diǎn)模糊.觸角向后伸達(dá)前胸背板中部,第2~11節(jié)相對長(寬)之比為6.0 (5.5)∶5.5 (5.5)∶4.5 (5.5)∶4.5 (5.5)∶4.5 (5.5)∶4.5 (5.5)∶5.0 (5.0)∶5.5 (7.0)∶5.5 (7.5)∶7.0 (7.5),第9節(jié)內(nèi)端緣,第10節(jié)端部內(nèi)、外緣及末節(jié)端部有金黃色感覺毛區(qū).
前胸背板寬于長1.88~2.10倍(平均1.97倍,n=10),近基部最寬,寬于頭部1.45~1.59倍(平均1.54倍,n=10);前緣弧凹,中間稍突出,飾邊中斷;側(cè)緣弱弧形,具完整細(xì)飾邊;基部向后微凸,僅兩側(cè)具細(xì)飾邊;前角鈍圓,后角非常圓;盤區(qū)隆起,布十分稀疏的淺小刻點(diǎn),其向兩側(cè)稍變稠密,側(cè)緣飾邊由背觀不可見.前胸側(cè)板有少量顆粒和縱皺紋.前胸腹板突窄,端部垂降.
鞘翅卵形,長大于寬1.17~1.30倍(平均1.22倍,n=10),中部稍前最寬,寬于前胸背板1.10~1.22倍(平均1.16倍,n=10);肩圓;盤區(qū)均勻隆起,著生淺小刻點(diǎn)和支狀皺紋,近端部鯊皮狀,側(cè)緣具稀疏顆粒;緣折幾乎達(dá)到鞘翅基部,表面有少量顆粒.可見腹板均布刻點(diǎn)和淺色微毛.肛節(jié)端部近直截.
足粗壯,前足脛節(jié)端外角強(qiáng)烈突出,頂尖,略超過第4跗節(jié)端部.中、后足脛節(jié)端部明顯向上彎曲;后足第1~4跗節(jié)相對長度之比為19.5∶8.0∶6.5∶15.5.
陽莖長1.40 mm(體長5.34 mm);陽基側(cè)突長0.73 mm,寬0.24 mm.陽基側(cè)突端半部強(qiáng)烈隆起,端部2/5處最寬,兩側(cè)中部變窄.
雌性:與雄性主要區(qū)別是鞘翅稍長,背面刻點(diǎn)十分稠密和清晰.產(chǎn)卵器見圖1l~m;第Ⅷ背板見圖1f;第Ⅸ腹板見圖1k;第Ⅷ腹板見圖1e.
a.頭部;b.觸角;c.前胸背板;d.♂第Ⅷ腹板;e.♀第Ⅷ腹板;f.♀第Ⅷ背板; 圖2 直緣寬額甲 Ascelosodis rectusg~i.陽莖背、腹和側(cè)面觀;j.♂第Ⅸ腹板;k.♀第Ⅸ腹板;l~m.產(chǎn)卵器背、sp.nov.(Scale=1 mm)腹面觀;Scale= 0.5 mm. 圖1 直緣寬額甲Ascelosodis rectus sp.nov.
體長:♂5.28~5.95 mm,♀5.34~6.78 mm;寬:♂2.73~3.05 mm,♀2.78~3.4 mm.
正模:♂,西藏拉孜措拉山,28°53.959′N,87°25.182′E,Alt.5 064 m,2011-08-02,任國棟采;副模:16♂27♀,記錄同正模.
新種在外形上與分布于西藏的斯氏寬額甲AscelosodisschmidiKaszab,1965相似,與后者的主要區(qū)別是:唇基前緣微凹;復(fù)眼前的前頰略擴(kuò)展;前胸背板前角鈍圓形,前緣中間略突出;肛節(jié)端部近于直截.
詞源學(xué):種名來自第5腹板端部直截.
2.2聶拉木寬額甲,新種Ascelosodis nyalamensis sp.nov.(圖3,4)
體黑色,具光澤,觸角、足及身體腹面棕黑色.身體側(cè)緣具很稀疏的黃色短毛.
雄性(圖3a~d,g~j):唇基葉較頰側(cè)葉明顯寬闊和突出,前緣直截或稍突出,具刻點(diǎn).前頰于眼前近平行,向唇基基部弱弧形收縮,與唇基葉通過淺刻痕明顯分開,近基部為頭部最寬處.復(fù)眼腎形.后頰于眼后漸縮.頭背面稍隆起,布稀疏圓刻點(diǎn)并在復(fù)眼內(nèi)側(cè)變?yōu)榘櫦y.觸角粗壯,向后伸達(dá)前胸背板基部,第2~11節(jié)相對長(寬)之比為8.0(7.0)∶13.0 (6.5)∶9.0(6.0)∶8.5(6.5)∶7.5(7.0)∶7.0(7.5)∶8.0(7.5)∶7.5(9.0)∶7.5(10.0)∶9.0(8.5),第9節(jié)端內(nèi)緣和第10節(jié)端部內(nèi)、外緣及末節(jié)端部有金黃色感覺毛區(qū).頦端部有闊三角形淺凹,布粗糙大刻點(diǎn)及亂皺紋.
前胸背板寬大于長1.86倍,中部稍前最寬,寬于頭部1.62倍;前緣弧凹;側(cè)緣圓,具完整細(xì)飾邊,有稀疏短睫毛;基部與前緣近平行,中間飾邊斷開;前角突出,近直角形,后角圓鈍.背面強(qiáng)烈隆起,盤區(qū)稀布粗糙刻點(diǎn),其向側(cè)緣稍稠密,部分刻點(diǎn)相連,呈皺紋狀.前胸側(cè)板布光滑縱皺紋.前胸腹板突近舌狀,向前緩降,向后稍突出,末端陡降.
鞘翅卵形,長大于寬1.13倍,近中部最寬,寬于前胸背板1.29倍.基部具不清晰的完整細(xì)飾邊;肩角圓.背面隆起,布稀疏的模糊淺點(diǎn).鞘翅緣折窄,光滑,于后足處向基部強(qiáng)烈變寬,并由背面可見.第1~3可見腹板具縱皺紋,其間有稀疏粗刻點(diǎn),第4~5可見腹板具稍稠密的粗糙刻點(diǎn).
足粗壯,腿節(jié)端部由背面可見.前足脛節(jié)外緣稍鋸齒狀.中、后足脛節(jié)外側(cè)稍彎;后足第1~4跗節(jié)相對長度之比為23.5∶10.0∶8.5∶21.5.
陽莖長1.51 mm(體長7.17 mm);陽基側(cè)突長0.88 mm,寬0.34 mm,兩側(cè)近于平行,端部具少量短毛,側(cè)觀弧形彎曲,近中部最寬.
雌性:產(chǎn)卵器見圖3 l~m;第Ⅷ背板見圖3f;第Ⅸ腹板見圖3k;第Ⅷ腹板見圖3e.
a.頭部;b.觸角;c.前胸背板;d.♂第Ⅷ腹板;e.♀第Ⅷ腹板;f.♀第Ⅷ背板;g~i.陽莖背、腹和側(cè)面觀;j.♂第Ⅸ腹板;k.♀第Ⅸ腹板;l~m.產(chǎn)卵器背、腹面觀;Scale= 0.5 mm.圖3 聶拉木寬額甲Ascelosodis nyalamensis sp.nov.
圖4 聶拉木寬額甲 Ascelosodis nyalamensis sp.nov.(Scale=1 mm)
體長:♂7.17~7.68 mm;♀7.25~7.88 mm;體寬:♂4.04~4.36 mm;♀4.11~4.43 mm.
正模:♂,西藏聶拉木門布鄉(xiāng)土龍,28°25.841′N,86°08.840′E,Alt.4478 m,2014-07-30.任國棟采;副模:1♂3♀,任國棟、白興龍、單軍生采,其他信息同正模.
本種與分布于西藏的凹飾寬額甲AscelosodisemarginataRen & Shi,2006相似,與后者的主要區(qū)別是:體側(cè)具稀疏短毛;前胸背板具稀疏的粗大刻點(diǎn),刻點(diǎn)向兩側(cè)匯合至皺紋狀;鞘翅基部具飾邊,具模糊稀疏淺刻點(diǎn).
詞源學(xué):種名來自模式標(biāo)本產(chǎn)地.
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(責(zé)任編輯:趙藏賞)
Two new species of the genus Ascelosodis (Coleoptera,Tenebrionidae) from Chinese Himalayas
SHAN Junsheng,REN Guodong
(Key Laboratory of Invertebrate Systematics and Application of Hebei Province,College of Life Sciences,Hebei University,Baoding 071002,China)
Two new species of the genusAscelosodisRedtenbacher,1868,A.rectussp.nov.andA.nyalamensissp.nov.,are described and illustrated from the Chinese Himalayas,and new faunistic data for 27 known species are added.
Coleoptera;Tenebrionidae;Ascelosodis;new species;Tibet
10.3969/j.issn.1000-1565.2016.02.011
2015-07-25
國家自然科學(xué)基金資助項(xiàng)目(31572309)
單軍生(1988—),男,河北石家莊人,河北大學(xué)在讀碩士研究生.E-mail:junshengshan@163.com
任國棟(1955—),男,寧夏中寧人,河北大學(xué)教授,博士生導(dǎo)師,主要從事鞘翅目異跗節(jié)類的系統(tǒng)分類研究.
E-mail:gdren@hbu.edu.cn
Q969.498.2
A
1000-1565(2016)02-0175-05