| Dettner, K; Böhner, M: Die Pygidialdrüse der Wassertreter (Coleoptera: Haliplidae): Morphologie, Chemie, Funktion und phylogenetische Bedeutung, Contributions to Natural History, 12, 437-460 (2009) | |
| Abstract: The pygidial gland of Crawling Water Beetles (Coleoptera: Haliplidae): Morphology, Chemistry, Function and Phylogenetic Significance. – The minute paired abdominal pygidial glands of crawling water beetles (Coleoptera: Haliplidae) were analyzed morphologically and chemically by prechromatographic derivatizations. Apart from the already known phenylacetic acid (3) in Peltodytes caesus, P. rotundatus, Brychius elevatus, Haliplus (Neohaliplus) lineatocollis, Haliplus (Haliplus) ruficollis, H. (Haliplus) heydeni, Haliplus (Liaphlus) fulvus, H. (Liaphlus) flavicollis, and H. (Liaphlus) laminatus the following antimicrobic and the body surface wetting compounds were analyzed for the first time: 3-hydroxyoctan- (1) and 3-hydroxydecanoic acids (2), 4-hydroxy- (4) and 3-hydroxyphenylacetic acids (6), phenyllactic acid (5) and benzoic acid (7). Especially by regarding the glandular tissue, the collecting channel, and the gland reservoir a phylogenetic arrangement of the taxa Brychius, the subgenus Neohaliplus and the remaining representatives of the genus Haliplus indicates that they represent a monophylum with Peltodytes and Neohaliplus as primitive representatives. In contrast the gland morphology of both Peltodytes representatives resembles the Geadephaga whereas the subgenera Liaphlus and Haliplus are mostly derived. |
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