page_title: List of woodlice of the British Isles
section_title: Armadillidiidae
hierarchical_section_title: List of woodlice of the British Isles / Armadillidiidae
context_page_description: Woodlice are the most species-rich group of terrestrial crustaceans. Of the 3,637 species found worldwide, some 35 species in 10 families are native to the British Isles. One of these species, Acaeroplastes melanurus, had been considered extinct in the British Isles but was rediscovered in 2002 at its only site, and a further ten species have become naturalised in greenhouses, presumably transported with exotic plants. Five species are especially common throughout the British Isles, and are known as the "famous five species". They are Oniscus asellus, Porcellio scaber, Philoscia muscorum, Trichoniscus pusillus and Armadillidium vulgare. One species, Metatrichoniscoides celticus, is endemic to Glamorgan, and is listed as a vulnerable species in the IUCN Red List.
context_section_description: "Pill bugs" of the family Armadillidiidae are often confused with pill millipedes such as Glomeris marginata, which is also widespread and common in Britain and Ireland, but pill millipedes have two pairs of legs per body segment, while woodlice have only seven pairs of legs. Six certainly native species occur in the British Isles; some doubt exists as to the status of Eluma caelatum.
caption: Armadillidium vulgare in the rolled-up defensive posture characteristic of pill bugs
exif: {"Image Make": "Panasonic", "Image Model": "DMC-FZ30", "Image Orientation": "Horizontal (normal)", "Image XResolution": "2173/4", "Image YResolution": "2173/4", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CS2 Windows", "Image DateTime": "2007:04:12 14:56:36", "Image YCbCrPositioning": "Co-sited", "Image PrintIM": "[80, 114, 105, 110, 116, 73, 77, 0, 48, 50, 53, 48, 0, 0, 14, 0, 1, 0, 22, 0, ... ]", "Image ExifOffset": "440", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "1066", "Thumbnail JPEGInterchangeFormatLength": "8386", "EXIF ExposureTime": "1/500", "EXIF FNumber": "63/10", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "100", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2007:04:12 13:15:23", "EXIF DateTimeDigitized": "2007:04:12 13:15:23", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "4", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "3", "EXIF MeteringMode": "Pattern", "EXIF LightSource": "Unknown", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "99/10", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "1650", "EXIF ExifImageLength": "1250", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "EXIF InteroperabilityOffset": "940", "EXIF SensingMethod": "One-chip color area", "EXIF FileSource": "Digital Camera", "EXIF SceneType": "Directly Photographed", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF DigitalZoomRatio": "0", "EXIF FocalLengthIn35mmFilm": "47", "EXIF SceneCaptureType": "Standard", "EXIF GainControl": "None", "EXIF Contrast": "Normal", "EXIF Saturation": "Normal", "EXIF Sharpness": "Normal"}