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Bucaniidae is an extinct family of paleozoic molluscs of uncertain position possibly being either Gastropods or Monoplacophorans in the superfamily Bellerophontoidea. The family lived from the Lower Ordovician to the Devonian and have shells in which the apertural margins tend to flare. Most genera have a slit and selenizone, others some modification of this feature. == Taxonomy == The taxonomy of the Gastropoda by Bouchet & Rocroi, 2005〔Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. 2005. ''Classification and nomenclator of gastropod families''. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. ISBN 3-925919-72-4. ISSN 0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278〕 categorizes Bucaniidae in the superfamily Bellerophontoidea, within the Paleozoic molluscs of uncertain systematic position with isostrophically coiled shells (Gastropoda or Monoplacophora). J.B. Knight ''et al'', in 1960〔 included the bucaniids in the Bellerophontidae as the subfamily Bucaniinae, and considered them true gastropods belonging to the prosobranch order, Archaeogastropoda, giving evidence that embyonic torson is not the cause of asymmetric coiling of typical gastropod shells. Physiologic restriction points to the viscera being turned 180 degrees with the gills and anus to the front and the aperture positioned to best facilitate retreat inward by the head and foot. The Trestise Part I divided the Bucaniinae into two tribes, the Bucaniides, in which the exhalent emargination is a short slit, and the Salpingostoma in which the exhalent orifice consists of one or more holes in series, known as trema. Bouchet & Rocroi, (2005) have elevated the tribes Bucaniides and Salpingostoma to the subfamilies Bucaniinae and Salpingostomatinae. They added the subfamilies, Undulabucaniinae and Plectonotinae which includes the tribes Plectonotini and Boucotonotini. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bucaniidae」の詳細全文を読む スポンサード リンク
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