胡海靜,姚云志,2*,任 東
(1.首都師范大學生命科學學院,北京 100048;2.現(xiàn)代古生物學和地層學國家重點實驗室,中國科學院南京地質古生物研究所,南京 210008)
沫蟬總科Cercopoidea 為昆蟲綱Insecta 半翅目Hemiptera頭喙亞目Auchenorrhyncha 的重要類群,以植物汁液為食,是一類重要的農(nóng)、林、牧業(yè)害蟲,有的種類能傳播植物病毒病,同時也是生物學研究的重要材料(梁愛萍,2005)。目前全世界已知約3000種,廣布于世界各地,我國已知300余種。之所以稱之為沫蟬是因為其若蟲腹部第七、八節(jié)有發(fā)達的泡沫腺,分泌的黏液從肛門排出時與空氣混合,形成泡沫狀液體包圍身體以作保護(梁愛萍,2005)。目前最古老的沫蟬在二疊紀發(fā)現(xiàn),距今已有 2 億多年歷史(Shcherbakov,1996)。研究沫蟬總科昆蟲化石不僅對探尋該類群的起源、演化、生活習性、繁殖方式及當時的生態(tài)環(huán)境有重要意義,而且對于研究不同地質時期古地理、古氣候、地球演變、生物進化等方面的問題均有重要價值。本文就當前世界沫蟬總科化石昆蟲的研究狀況、存在問題及研究前景加以綜述。
世界沫蟬總科昆蟲化石的研究歷史達170年之久。19世紀中后期為沫蟬總科化石研究的起步階段,該時期主要特點是對沫蟬總科化石進行簡單形態(tài)分類學研究。1843年 Charpentier(Charpentier,1843)首次對克羅地亞地區(qū)第三紀昆蟲化石進行研究,建立了沫蟬總科化石的1屬種Hylotoma cineracea,隨后有Heer(1853,1856,1857,1865),Germar and Berendt(1856),Giebel(1856,1862),Weyenbergh(1874),Scudder(1878,1890,1895),Woodward(1879),Geinitz(1884),F(xiàn)orster(1891)等陸續(xù)對沫蟬總科化石進行簡單的描述。
20世紀初中期為沫蟬化石研究的快速發(fā)展時期。Melichar(1902),Handlirsch(1904,1906,1939),Tillyard(1918,1919,1922,1926),Cockerell(1920,1922,1925,1927),Martynov(1928,1931,1935,1937),Zalessky(1929),Piton and Theobald(1935),Piton(1936),Carpenter and Miller(1937),Theobald(1937),Davis(1942),Evans(1943),Zeuner(1944),Becker-Migdisova(1952,1953),Bode(1953)等學者對沫蟬總科進行了詳細的分類描述,建立了大量的新屬種,為沫蟬化石的進一步研究奠定了堅實的基礎。
從20世紀中期至今是沫蟬化石系統(tǒng)研究和逐步完善時期。一方面,Evans(1956,1958,1961,1963),Becker-Migdisova(1960,1961,1962,1964),F(xiàn)ujiyama(1973),Riek(1973,1974,1976),Lin(1977,1982a,b,c,1986,1992),Hong(1982,1983,1993),Shcherbakov(1988),Martins-Neto(1989),Heggemann et al.(1990),Brauckmann and Schluter(1993),Ansorge(1994,1996),Ren et al.(1995,1998),Lin and Li(1997),van Dijk and Geertsema(1999),Martins-Neto and Gallego(1999,2001,2006),Martins-Neto et al.(2003,2006),Zhang(2003),Szwedo and Wappler(2006),Wang and Zhang(2009)描述了大量新的沫蟬化石種類,不斷豐富沫蟬總科昆蟲化石的記錄;另一方面,在經(jīng)典分類學的基礎上,結合現(xiàn)生類群的結構特征,開始通過系統(tǒng)發(fā)育關系分析,深入研究整個沫蟬總科的起源、演化路線、進化關系等,進而推斷其生活習性及當時的生態(tài)環(huán)境等問題(Shcherbakov,2000;Cryan,2005,2010)。
到目前為止,世界沫蟬總科昆蟲化石已經(jīng)記載了6科、117屬、252種,化石產(chǎn)地主要分布在俄羅斯、美國、德國、澳大利亞、中國等23個國家(表1)。
表1 世界已發(fā)現(xiàn)的沫蟬總科昆蟲化石名錄Table 1 A checked list of Cercopoidea fossil found in the world.
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我國沫蟬總科昆蟲化石研究始于20世紀70年代后期。1977年,林啟彬首次對產(chǎn)于我國云南勐臘縣早第三紀的沫蟬總科昆蟲化石進行研究,建立1屬1種Nisocercopis validis Lin,1977。目前為止,中國學者共發(fā)表沫蟬總科化石23屬29種(表2)。已知中國沫蟬總科化石產(chǎn)地分布于13個省市:江蘇(林啟彬,1982)、福建(林啟彬,1982,1986)、陜西(林啟彬,1982)、遼寧(洪友崇,1982,1983;任東等,1998)、河北(洪友崇,1983;任東等,1995)、北京(洪友崇,1983;任東等,1995)、湖南(林啟彬,1986)、新疆(林啟彬,1992;張海春,2003)、黑龍江(洪友崇,常建平,1993)、云南(林啟彬,1997)、香港(林啟彬,1997)和內(nèi)蒙古(王博和張海春,2009),同一產(chǎn)地化石種類相對單一,以遼寧省化石種類最多,共5屬6種。化石產(chǎn)出的時代從晚二疊世到第三紀均有發(fā)現(xiàn)(表2),但絕大部分集中在三疊紀和侏羅紀。我國最早的沫蟬總科化石是采自江蘇武進晚二疊世,龍?zhí)督M的Rhipiscytina brimis Lin,1982和Rhipiscytina radia Lin,1982。
二疊紀 最早的半翅目昆蟲出現(xiàn)在摩拉維亞地區(qū)(捷克)早二疊世阿丁斯克期(Artinskian)古蟬總科的Archescytinidae,出現(xiàn)的類群較為單一。從阿丁斯克期(Artinskian)時期到空谷期(Kungurian),Archescytinid 非常繁盛并達到頂峰,成為當時蟬類中的優(yōu)勢類群(Carpenter,1992;Shcherbakov and Popov,2002)。晚二疊世烏菲姆期(Ufimian)到早卡贊期(Kazanian)(西伯利亞的Kaltan 地區(qū)和俄羅斯的Soyana 地區(qū))出現(xiàn)了Scytinopteridae。在韃靼期(Tatarian),Dysmorphoptilidae和Scytinopteridae 在南非的納塔爾(Middle Beaufort Series)和澳大利亞的新南威爾士州(Belmont)出現(xiàn)(Shcherbakov and Popov,2002)。在晚二疊世,Scytinopteridae和Prosbolidae的分異度達到最大,成為當時優(yōu)勢類群,而且他們的地理分布區(qū)充分顯示了二疊紀氣候帶情況(Shcherbakov,2000)。
三疊紀 一些中、晚三疊世的昆蟲類群不同于二疊紀。早卡贊期出現(xiàn)的蟬亞目的類群中,只有Scytinopteridae 存活下來(Becker-Migdisova,1949)。此外,這個時期還存在直至早白堊世一直都有記錄的Ipsviciidae科。在中、晚三疊世的地層(吉爾吉斯斯坦的Madygen 組,南非東部開普的Moteno 組和昆士蘭的 Mount Crosby 組)中,Scytinopteridae 是主要的優(yōu)勢類群之一,其次Dysmorphoptilids 也占有一定優(yōu)勢(Shcherbakov and Popov,2002)。
侏羅紀 早侏羅世,大量的現(xiàn)生總科甚至許多科均出現(xiàn),例如:沫蟬總科Cercopoidea 的原沫蟬科Procercopidae。在三疊紀出現(xiàn)的的類群中,桿葉蟬科Hylicellidae 延續(xù)到侏羅紀并開始繁盛,與此同時,出現(xiàn)了一些新的類群,如中亞的原沫蟬Procercopidae,在體型較大的蟬中占領了主要位置;至于體型較小的蟬,scytinopteroids 已經(jīng)被Progonocimicidae 取代(Shcherbakov and Popov,2002)。
白堊紀 在侏羅紀/白堊紀之交,動物區(qū)系發(fā)生了明顯的改變。與侏羅紀明顯不同,原沫蟬Procercopidae 成為早白堊世的優(yōu)勢類群。一些早中生代的典型代表種類,如畸形沫蟬科Dysmorphoptilidae在進入白堊紀后滅絕(Shcherbakov and Popov,2002)。在大量類群絕滅的同時,一些現(xiàn)生的類群于侏羅紀/白堊紀之交開始出現(xiàn)。在中白堊世,一些中生代類群滅絕,包括原沫蟬科Procercopidae?,F(xiàn)生的尖胸沫蟬科Aphrophoridae和沫蟬科Cercopidae 此時已經(jīng)出現(xiàn)(Shcherbakov and Popov,2002)。
表2 我國已發(fā)現(xiàn)的沫蟬總科化石昆蟲名錄Table 2 A checked list of Cercopoidea fossils found in China
第三紀 進入新生代,現(xiàn)生類群開始大量爆發(fā),種類和數(shù)量急劇增加。漸新世出現(xiàn)沫蟬總科的長盾沫蟬科Clastopteridae(Scudder 1890),至此,現(xiàn)生蟬亞目類群格局初步形成。從第三紀的化石記錄可以看出,喜暖的蠟蟬和喜冷的沫蟬為優(yōu)勢類群(Shcherbakov and Popov,2002)。
世界沫蟬總科昆蟲化石分布于澳大利亞(Tillyard,1918,1919,1922,1926;Evans,1943,1956,1958,1961,1963)、德 國(Heer,1853,1865;Weyenbergh,1874;Geinitz,1884;Handlirsch,1906,1939;Bode,1953;Brauckmann and Schluter,1993;Ansorge,1994,1996;Van Dijk and Geertsema,1999)、美國(Scudder,1878,1890)、俄羅斯(Handlirsch,1904;Cockerell,1925,1927;Martynov,1928;Zalessky,1929;Martynov,1935;Davis,1942;Becker-Migdisova,1952,1960,1961)、中國(Lin,1977,1982,1986,1992,1997;Hong,1982,1983,1993;Zhang et al.,2003;Ren et al.,1995,1998;Wang and Zhang,2009)等23個國家。其中澳大利亞有53種,占總數(shù)的21%(圖1)。
圖1 世界沫蟬總科化石地區(qū)分布Fig.1 The distribution of described Cercopoidea fossils in the world(area)
世界沫蟬總科化石從二疊紀到新生代均有發(fā)現(xiàn),大多數(shù)集中在第三紀、二疊紀以及三疊紀。其中包括二疊紀67種,三疊紀58種,侏羅紀40種,白堊紀10種,第三紀82種(圖2)。
圖2 各地質年代世界已發(fā)現(xiàn)的沫蟬總科昆蟲化石數(shù)目Fig.2 The fossil number of Cercopoidea found in differert geological age
已記載的沫蟬總科昆蟲化石共涉及6科117屬252種。其中沫蟬科Cercopidae種類最多,共有32屬97種,占全部已描述定名標本總數(shù)的38.6%;其次是Scytinopteridae科有41屬77種,占全部已描述定名標本的30.7%;Procercopidae科有13屬30種,占11.9%;Ipsviciidae科有20屬25種,占9.9%;Dysmorphoptilidae科 有 6屬 16種,占6.4%;Eoscarterellidae科有4屬6種,占2.4%(表1)。
沫蟬總科昆蟲化石研究已達一百多年之久,國內(nèi)外學者做了大量工作,但隨著研究工作的不斷深入,一些問題也逐漸凸顯出來,主要有以下6方面。
現(xiàn)生類群多用前胸背板、足、肩片、生殖器等特征作為分類鑒定的依據(jù),而絕大多數(shù)化石標本保存不完整,蟲體結構通常受擠壓變形,只是較為堅韌的翅保存清晰,已發(fā)現(xiàn)的化石屬種很多僅依據(jù)翅脈特征進行分類,因而導致部分種類的分類位置存疑,例如,Becker-Migdisova(1960)僅根據(jù)單個翅標本建立Prosbolopsites tillyardi(圖3),但Carpenter(1992)和Evans(1956)將該標本歸入Eoscarterella。
圖3 Eoscarterella tillyardi Becker-Migdisova,1960(仿Becker-Migdisova,1960)Fig.3 Eoscarterella tillyardi Becker-Migdisova,1960(after Becker-Migdisova,1960)
由于化石保存的不完善,在已發(fā)現(xiàn)的昆蟲化石中存在科未定和種未定的類群。如Allocercopis Lin,1997,因化石僅保存部分前翅而無法定種(林啟彬1997)。又如Tychticoloides belmontensis Evans,1963(圖4),因模式標本僅保存部分前翅,特征缺少,科未定。
圖4 Tychticoloides belmontensis Evans,1963 ?(科未定)(仿Evans,1963)Fig.4 Tychticoloides belmontensis Evans,1963 ?(incertae sedis)(after Evans,1963)
由于化石標本的保存不全,化石分類常帶有較大的主觀性,造成化石種分類的準確性降低。如Anthoscytina Hong,1983(圖5),當時因臀區(qū)缺少,被歸為革翅蟬科 Scytinopteridae,1988年Schcherbakov 修訂了該屬的科級地位,將其轉移到原沫蟬科Procercopidae(任東,1995)。
圖5 Anthoscytina longa Hong,1983,前翅(仿Hong,1983)Fig.5 Anthoscytina longa Hong,1983,forewing(after Hong,1983)
如不同的學者分別將兩個絕滅科Procercopidae Handlirsch,1906和Ipsviciidae Tillyard,1919 都命名為“原沫蟬科”(Lin,1982;Hong,1983)。Procercopidae Handlirsch,1906 根據(jù)拉丁文名的詞源構成,可以譯為“原沫蟬科”,而Ipsviciidae Tillyard,1919 譯為相同的中文名則不可取。
Tillyard(1919) 最初將其放在同翅目Homoptera,認為與已滅絕的Syntonopteridae科關系較近,但Tillyard(1926)將其轉移到同翅目蠟蟬總科Fulgoroidea,隨后,Evans(1956)將其放在異翅目Heteroprera;Becker-Migdisova(1962)將其轉移到同翅目頭喙亞目Auchenorrhyncha;China(1962)將其轉移到同翅目Peloridioidea;Evans(1963)將其轉移到同翅目沫蟬總科Cercopoidea。Evans(1956)將8個屬Apheloscyta,Permocentrus,Permagra,Permovicia,Palaeovicia,Permoscarta,Stanleyana,Stenovicia 轉移到一個新科Stenoviciidae,盡管大多數(shù)原來屬于Ipsviciidae Evans(1943b)。Becker-Migdisova(1962)認為沒有必要建立新科,本文按照此觀點將這八個屬放在Ipsviciidae科(Carpenter,1992)。
目前沫蟬總科的研究工作集中在傳統(tǒng)的分類學研究,即對化石標本的描述及分類鑒定,而生物學、系統(tǒng)發(fā)育學、重要特征功能形態(tài)學以及不同地質時期生存環(huán)境的研究等很少。儀器設備仍然是傳統(tǒng)的光學顯微鏡和光學成像系統(tǒng),掃描電鏡、能譜儀、CT 等儀器應用較少。
在前人的研究基礎上,沫蟬總科昆蟲化石的研究在以下幾個方面有待進一步展開。
我國蟬類昆蟲化石數(shù)量豐富,已描述定名的同翅目昆蟲化石標本僅占少數(shù),仍需進行大量系統(tǒng)的基礎分類研究。
對比化石與現(xiàn)代昆蟲形態(tài)差異,研究其形態(tài)特征演化;綜合化石與現(xiàn)生類群的形態(tài)學數(shù)據(jù)構建系統(tǒng)發(fā)育樹;利用化石本身所具有的時間特性,校正已有的系統(tǒng)發(fā)育樹這三個方面將是未來很長一段時間的研究重點。
根據(jù)化石記錄,結合地質學、埋藏學、古地理和古氣候等學科的相關知識,研究沫蟬昆蟲應對環(huán)境變化的各種演化策略,如形態(tài)結構(口器、觸角、翅、足),行為方式(取食、生殖),棲息環(huán)境等的改變,進一步探討沫蟬與環(huán)境協(xié)同演化的關系,并對研究生物對環(huán)境的適應機制及生物的絕滅機制有重要的推動作用。
以經(jīng)典分類學和系統(tǒng)學為基礎,利用形態(tài)、分子和化石的證據(jù),從宏觀和微觀、古生和現(xiàn)生多角度,綜合分析古生物學、現(xiàn)代分子生物學、功能形態(tài)學以及分支生物地理學等學科特點,采用CT、掃描電鏡、能譜分析、3D 成像等多種技術手段對沫蟬起源演化進行研究,重建沫蟬的自然演化歷史。
綜上所述,目前沫蟬總科化石的研究已經(jīng)取得了較大進展,描述鑒定了大量新屬種,豐富了這一類群,但由于研究條件所限,研究工作還不夠深入,同時也存在不少問題。隨著各國學者的研究,國際間交流合作的增強,古昆蟲學分類方法的不斷完善,學科間的交叉結合,新的研究方法手段的應用,這些問題將得到不同程度的解決。
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