Xylopagurus A. Milne Edwards 1880

Xylopagurus A. Milne Edwards, 1880 Diagnosis. Gills biserial or distally quadriserial, 13 pairs. Rostrum obtusely triangular. Ocular acicles multispinose. Crista dentata with 1 accessory tooth. Chelipeds grossly unequal; palm of right with prominent spine or protuberance at mesial dorsodistal angle. Sternite of somite XII (thoracomere 6, pereopods 3) with narrow or subtriangular anterior lobe. Pereopod 4 semichelate; propodal rasp with numerous rows of small, corneous scales; no preungual process. Pereopod 5 subchelate, sometimes sexual dimorphic. Male with pleopods 1 and 2 paired, modified; no unpaired pleopods. Female with pleopods 2-4. Tergites of abdominal somites 2–5 as narrow calcified plates, tergite 6 heavily calcified and operculate; uropods symmetrical. Telson without lateral indentations, broader than long, terminal margin entire. Type species: Xylopagurus rectus A. Milne-Edwards, 1880.木寄居蟹属（Xylopagurus）A. Milne Edwards, 1880 鉴别特征：鳃为双列型或远端四列型，共13对。额角呈钝三角形。眼柄棘片（ocular acicles）具多枚棘刺。齿脊（crista dentata）具1枚副齿。螯足极不对称；右螯掌节的背末内侧角处具显著棘刺或突起。第XII体节（胸节6，对应第3步足）的腹板具窄三角形或近三角形的前叶。第4步足为半螯状；其掌节锉突具多列小型角质鳞片，无爪前突。第5步足为亚螯状，部分类群存在雌雄二型性。雄性具第1、2对特化腹肢，无单生腹肢；雌性具第2至4对腹肢。第2至5腹节的背板为狭窄钙化板，第6腹节背板高度钙化且呈盖状；尾肢对称。尾节无侧凹，宽大于长，末端边缘完整。模式种：直形木寄居蟹（Xylopagurus rectus）A. Milne-Edwards, 1880。