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The Thoracic Morphology of Archostemata and the Relationships of the Extant Suborders of Coleoptera (Hexapoda)

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The Thoracic Morphology of Archostemata and the Relationships of the Extant Suborders of Coleoptera (Hexapoda) The Thoracic Morphology of Archostemata and the Relationships of the Extant Suborders of Coleoptera (Hexapoda) The Harvard community has made this article openly available. Please share how this access benefits you. Your story matters Citation Friederich, Frank, Brian D. Farrell, and Rolf G Beutel. 2009. The thoracic morphology of Archostemata and the relationships of the extant suborders of Coleoptera (Hexapoda). Cladistics 25, no. 1: 1-37. Published Version http://dx.doi.org/10.1111/j.1096-0031.2008.00233.x Citable link http://nrs.harvard.edu/urn-3:HUL.InstRepos:3114645 Terms of Use This article was downloaded from Harvard University’s DASH repository, and is made available under the terms and conditions applicable to Other Posted Material, as set forth at http:// nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of- use#LAA Cladistics Cladistics 25 (2009) 1–37 10.1111/j.1096-0031.2008.00233.x The thoracic morphology of Archostemata and the relationships of the extant suborders of Coleoptera (Hexapoda) Frank Friedricha,*, Brian D. Farrellb and Rolf G. Beutela aInstitut fu¨r Spezielle Zoologie und Evolutionsbiologie, Friedrich-Schiller-University Jena, D–07743 Jena, Germany; bMuseum of Comparative Zoology, Harvard University, Cambridge, MA 02138, USA Accepted 28 May 2008 Abstract Thoracic structures of Tetraphalerus bruchi are described in detail. The results were compared with features found in other representatives of Archostemata and other coleopteran suborders. Differences between thoracic structures of Tetraphalerus and members of other archostematan subgroups are discussed. External and internal characters of larval and adult representatives of 37 genera of the coleopteran suborders are outlined, coded and analysed cladistically, with four groups of Neuropterida as outgroup taxa. The results strongly suggest the branching pattern Archostemata + [Adephaga + (Myxophaga + Polyphaga)]. Coleoptera excluding Archostemata are supported with a high Bremer support. Important evolutionary changes linked with this branching event are simplifications of the thoracic skeleton resulting in reduced degrees of freedom (i.e. a restricted movability, especially at the leg bases), and a distinct simplification of the muscle system. This development culminates in Polyphaga, which are also strongly supported as a clade. Internalization of the partly reduced propleura, further muscle losses, and the fusion of the mesoventrites and metaventrites—with reversal in Scirtoidea and Derodontidae—are autapomorphies of Polyphaga. Archostemata is a small relict group in contrast to highly successful xylobiontic groups of Polyphaga. The less efficient thoracic locomotor apparatus, the lack of cryptonephric Malpighian tubules, and the rise of angiosperms with beetle groups primarily adjusted to them may have contributed to the decline of Archostemata. Ó The Willi Hennig Society 2008. Introduction (1975), with 14 characters mapped on it. A different hypothesis with Archostemata as sister group of The key role of the small relict group Archostemata Adephaga was proposed by Baehr (1979) based on a in the phylogenetic reconstruction of the extremely non-numerical analysis of prothoracic features, similar species-rich Coleoptera is reflected by the widely to a scheme earlier suggested by Vulcano and Pereira recognized preservation of many plesiomorphic fea- (1975), with ‘‘Cupediformia’’ as a subordinate group of tures in the adult stage (Beutel and Haas, 2000; Adephaga. A branching pattern Polyphaga + [Arch- Kukalova´ -Peck and Lawrence, 2004), the strong rep- ostemata + (Myxophaga + Adephaga)] was sug- resentation in the early Mesozoic fossil record (Pon- gested by Kukalova´ -Peck and Lawrence (1993) based omarenko, 1969), and the controversy about its on an informal evaluation of characters of the hind placement in older and recent phylogenetic studies. A wing. The first cladistic evaluation of a comprehensive scenario with Archostemata as the most ancestral morphological data set was presented by Beutel and branch and the small suborder Myxophaga closely Haas (2000). The results confirmed CrowsonÕs idea, related with the extremely species-rich Polyphaga was with the branching pattern Archostemata + [Adeph- suggested by Crowson (1960). This scheme was pre- aga + (Myxophaga + Polyphaga)]. This was again sented as a Hennigian phylogenetic tree by Klausnitzer challenged by Kukalova´ -Peck and Lawrence (2004), who obtained the same pattern as in their earlier study *Corresponding author: with a numerical analysis of a similar set of wing E-mail address: [email protected] characters. In a molecular study based on 18S rDNA Ó The Willi Hennig Society 2008 2 F. Friedrich et al. / Cladistics 25 (2009) 1–37 Adephaga and Polyphaga were placed as sister groups, based on the results of the cladistic analyses, with the with Archostemata and Myxophaga basal to them focus on the question of why Archostemata, which (Shull et al., 2001; see also Vogler, 2005). In another were a rather successful lineage in the early Mesozoic, analysis of 18S rDNA data (Caterino et al., 2002), became nearly extinct, whereas other wood associated Archostemata was placed as sister group of the other groups such as Buprestidae and Cerambycidae were suborders after constraining Coleoptera and the sub- extremely successful. orders as monophyletic, and Adephaga as sister taxon of Polyphaga, as in Shull et al. (2001). A sister-group relationship between Cupedidae (as the only archoste- Materials and methods matan terminal) and the myxophagan family Sphaeri- usidae was obtained in a recent molecular study with a List of species studied (terminal taxa used in cladistic very comprehensive sampling of adephagan and analysis in bold face). For additional taxa examined see polyphagan taxa (Hunt et al., 2007). Beutel and Haas (2000). Despite the widely recognized phylogenetic impor- Owing to lack of material or unknown immature tance of the group, the morphology of archostematan stages several terminal taxa included in the analyses (e.g. species, which are generally rare or extremely rare Raphidiidae, Corydalinae, Ommatidae, Cupedidae) are (Beutel et al., 2008), is still insufficiently studied. chimeras with different larval and adult representatives. Whereas a considerable amount of information on This approach was used when both stages belong to larval features (Beutel and Ho¨ rnschemeyer, 2002a,b) different supraspecific taxa, which are however more and adult head structures (Ho¨ rnschemeyer et al., 2002, closely related to each other than with any other taxon 2006; Beutel et al., 2008) has accumulated recently, to used in the analysis. date, Priacma serrata was the only species of Archo- Archostemata: Cupedidae (chimera): Priacma serrata stemata with well-studied and documented thoracic LeConte, 1861 (A = adult: FAE = formaldehyde– features (Baehr, 1975). Therefore, an improved knowl- ethanol–acetic acid; diss. = dissected, SEM = scan- edge of archostematan thoracic structures appeared to ning electron microscopy; Montana, USA, collected by be highly desirable. In 2006, a series of Tetraphalerus PD Dr Th. Ho¨ rnschemeyer [University of Go¨ ttingen]), bruchi, a very rare species of Ommatidae, was collected Rhipisideigma raffrayi (Fairmaire, 1884) (L = larva: by Adriana Marvaldi in the framework of the Beetle ethanol; diss., micr. = microtome sections; northern Tree of Life (BToL) project. Some specimens were used Madagascar, Ambohitantely Nat. Res., collected by for extraction of DNA and others for morphological P. Sˇ va´ cha) investigations. One purpose of the present study was Ommatidae (chimera): Tetraphalerus bruchi Heller, the detailed documentation of thoracic features using 1913 (A: FAE; diss., micr., l-CT, SEM; Argentina, innovative morphological techniques such as micro- Provincia de Mendoza, collected by Dra. A. Marvaldi), computer tomography (l-CT) imaging and computer- Omma stanleyi Newman, 1839 [L: ethanol; external aided three-dimensional reconstructions. The second features examined (Australian National Insect Colle- aim is the re-evaluation of the interrelationships of the tion, CSIRO Canberra)] four coleopteran suborders. The available morpholog- Micromalthidae: Micromalthus debilis Heller, 1913 ical data, not only concerning Archostemata, but also (A: FAE; diss., micr., l-CT; collected from colonies in other groups of beetles has greatly increased during the the labs of Prof. Dr. D. R. Maddison and T. Ho¨ rn- last few years (Beutel and Ho¨ rnschemeyer, 2002a,b; schemeyer, respectively) Ho¨ rnschemeyer et al., 2002, 2006; Anton and Beutel, Myxophaga: Torridincolidae: Ytu zeus Reichardt, 2004, 2006; Beutel and Komarek, 2004; Ho¨ rnschemeyer, 1973 (L: micr., SEM; A: micr.; Brazil, provided by 2004, 2005; Lawrence, 2005; Leschen, 2005; Friedrich Prof. Dr. Cl. Costa), Satonius kurosawai (Satoˆ , 1982) (L, and Beutel, 2006; Ge et al., 2007; Beutel et al., 2008). A: ethanol; Japan, Aichi Prefecture, collected by the late Therefore, it appeared appropriate to readdress the Masataka Satoˆ ) issue of the subordinal interrelationships based on an Microsporidae: Microsporus spp. (undetermined spe- extensive morphological data set involving characters cies from Arizona and Europe) (L, A: FAE; micr., SEM; of different life stages and external and internal Arizona, USA, collected by R. G. Beutel and D. R. structures of all body regions. The starting point was Maddison) a data matrix presented in Beutel and Haas (2000). Hydroscaphidae: Hydroscapha natans LeConte, 1874 However, many data unavailable
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