Phylogenetic relationships of the orders of Hexapoda:contributions from the circulatory organs for a morphological matrix

Translated title of the contribution: Phylogenetic relationships of the orders of Hexapoda:contributions from the circulatory organs for a morphological matrix

Günther Pass, Barbara-Amina Gereben-Krenn, Monika Eberhard, Nikolaus Szucsich, Markus Tögel

    Publications: Contribution to journalArticlePeer Reviewed

    Abstract

    Discussions of phylogenetic studies based on morphological data focus mainly on results of the cladistic analysis while selection and evaluation of characters themselves are often underrepresented. Our paper seeks to address this with a survey of characters of the circulatory organs to contribute to the analysis of phylogenetic relationships of hexapod orders. The survey is based on examination of literature and includes, in addition, numerous unpublished data. Of 38 variable traits of the dorsal vessel and the various accessory circulatory organs, we selected 11 which are potentially informative at supraordinal level. They are critically discussed and coded as characters for use in comprehensive future cladistic analyses employing greater sets of morphological data. It must be stated that many features of circulatory organs for higher systematic categories are still based on one or few species for most orders of hexapods; this defi ciency is due to the great methodological effort required to investigate internal organs. In general, circulatory organs of hexapods are simply organized making it diffi cult to discriminate homology from convergence. In addition to phylogeny, general aspects of the evolution of the circulatory system are outlined. In an appendix we provide comprehensive information on the traits, characters and the species in which they occur.
    Translated title of the contributionPhylogenetic relationships of the orders of Hexapoda:contributions from the circulatory organs for a morphological matrix
    Original languageGerman
    Pages (from-to)165-203
    Number of pages39
    JournalArthropod Systematics & Phylogeny
    Volume64
    Issue number2
    Publication statusPublished - 2006

    Austrian Fields of Science 2012

    • 106012 Evolutionary research
    • 106046 Animal anatomy

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