saasp22 - Systematic & Applied Acarology Special...

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(2006) 22, 1–14 1 © 2006 ISSN 1461-0183 Hericia sanukiensis , a new species of Algophagidae (Astigmata) inhabiting sap flux in Japan NORMAN J. FASHING 1 2 1 Department of Biology, College of William and Mary, Williamsburg, VA 23187-8795, USA. 2 Abstract A new species, Hericia sanukiensis , is described and illustrated from adults, phoretic deutonymphs and non- phoretic deutonymphs collected from sap flux on oak trees ( Quercus acutissima Carruth.) in Takamatsu City, Kagawa Prefecture, Japan. Deutonymphs are phoretic on the sap flux inhabiting beetle Librodor japonicus (Motschulsky) (Coleoptera, Nitidulidae). Key words: Acari, Algophagidae, Hericia , sap flux, Librodor japonicus , Japan Introduction Robin (1868) described Glycyphagus hericious , an inhabitant of sap flux on English elm ( Ulmus minor Mill., formerly U. campestris L.) in France. Canestrini (1888) recognized the species was not in the genus Glycyphagus and established the genus Hericia to accommodate it. However Canestrini (1888) also changed the specific name from hericius to robinii , a mistake that has since been corrected and the species is now known as H. hericia . To date, three additional species of Hericia have been described: H. georgei Michael 1903 from the sap of an English black poplar ( Populus nigra L.), H. fermentationis Vitzthum 1931 from strongly fermenting, sour, milk-white liquid in a cut-off bamboo stump in Sumatra, and H. paradoxa Türk and Türk 1957 from a deutonymph found in birch rot in Germany. The present paper describes a fifth species collected from sap flux on sawtooth oak ( Quercus acutissima Carruth) (Fagaceae), in Kagawa Prefecture, Japan. Materials and methods Bark and wood were collected from sap flux on sawtooth oak trees ( Quercus acutissima ), brought back to the laboratory, and examined for mites under a dissecting microscope. Specimens were cleared in a mixture of Lactophenol and Nesbitt’s solution and mounted in Hoyer’s medium on microscope slides (Krantz 1978; Evans 1992). Measurements were taken on ten individuals of each stage and are given in micrometers ( μ m) in the following order: holotype, mean and range (in parentheses). Relative position of setae and other structures are as in figures. Nomenclature for idosomal setae follows Griffiths et al . (1990) and for leg setae Grandjean (1939). For observation of characters under the scanning electron microscope (SEM), specimens were dehydrated in ethyl alcohol, dried using the critical point procedure, individually affixed to stubs using double-sided sticky tape, and coated with gold-palladium in a sputter coater. Microscopy was performed on an AMR 1200.
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FIGURES 1–4. Hericia sanukiensis , sp. n., female—1. chelicera, lateral view, 2. gnathosoma, ventral view, 3. dorsum, 4. venter.
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saasp22 - Systematic & Applied Acarology Special...

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