Discrimination of <Emphasis Type="Italic">Oribotritia</Emphasis> species by oil gland chemistry (Acari,Oribatida) |
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Authors: | Günther Raspotnig Verena Leutgeb Günther Krisper Hans-Jörg Leis |
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Institution: | 1.Institute of Zoology,Karl-Franzens-University,Graz,Austria;2.Childrens Hospital, Research Unit of Osteology and Analytical Mass Spectrometry,Medical University,Graz,Austria |
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Abstract: | The chemical composition of secretions from opisthonotal (oil) glands in four species of the oribatid mite genus Oribotritia (Mixonomata, Euphthiracaroidea, Oribotritiidae) was compared by means of gas chromatography—mass spectrometry. The secretions
of all, O. banksi (from North America) and three Austrian oribotritiids (O. berlesei, O. hermanni, O. storkani), are shown to be based on certain unusual compounds, the iridoid monoterpenes chrysomelidial and epi-chrysomelidial and
the diterpene β-springene. These components probably represent general chemical characteristics of oribotriid oil glands.
Their relative abundance in the secretions along with further components (mainly saturated and unsaturated C13-, C15-, C17-hydrocarbons, and the tentatively identified octadecadienal) led to well-distinguishable, species-specific oil gland secretions
profiles. In addition a reduced set of “Astigmata compounds” (sensu Sakata and Norton in Int J Acarol 27:281–291, 2001)—namely the two monoterpenes neral and geranial—could be detected in extracts of O. banksi nevertheless indicating the classification of euphthiracaroids within the (monophyletic) group of “Astigmata compounds-bearing”-Oribatida.
These compounds are considered to be apomorphically reduced in all Austrian species. Our findings emphasize the potential
of chemosystematics using oil gland secretion profiles in the discrimination of morphologically very similar, syntopically
living or even cryptic oribatid species. |
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