F - furcula 中文 - EN166

furcula n.(pl. -lae ) 【解剖學；動物學】叉突；Y腺...

furculum
The feathers attached to the arms and the tail evidently possess the structures of “ modern feathers “ , which consisting of the central shafts ( rachis ) and parallel barbs . dromaeosaurids are unusual group of maniraptoran theropods . they share many similar or the same features with archaeopteryx or other primitive birds , such as : u - shaped furcula , uncinate process , laterally facing glenoid of shoulder girdle , comparatively long forelimb , large semilunate carple , retroverted pubis , ascending process of astragalus , and “ modern feathers “ with rachis and barbs etc . these facts indicate not only that dromaeosaurids had developed many bird - like characters in course of the advanced maniraptorans toward birds , but also that there seemed to be the co - evolutionary trend between the feathers and the skeletal bones 奔龍類是一類較為特殊的手盜龍類( maniraptora ) ，它具有許多與始祖鳥archaeopteryx甚至其它早期鳥類相似或接近的特征，主要表現在：叉骨u形與始祖鳥和孔子鳥類的相同，背肋鉤狀突在孔子鳥類和個別反鳥類中也存在，肩臼窩絕大部分指向側方類似于始祖鳥，肩胛骨與烏喙骨間的夾角非常接近90也和始祖鳥的相似，前肢從比例上講顯得較長，大的半月形腕骨使肘部能向側方折過來，恥骨伸向后下方，距骨上升突與原始鳥類中的為同源結構，羽毛已有顯著的分化且具備了現代羽毛的基本結構等等。
It shows many typical characters seen in the type species of the genus of sinornithosaurus , which discovered also from western liaoning . ngmc 00 - 12 - a can further be included in sinornithosaurus by the dentary bifurcated posteriorly , unserrated premaxillary teeth , u - shaped furcula , extremel y short manual phalanx iii - 2 in comparison with the length of phalanx iii - l , very large and developed obturator process of the ischium , partially arctometatarsalian metatarsal iii and so on 它具有許多中國鳥龍屬sinornithosaurus所特有的特征，如：齒骨后部分叉、前頜骨齒齒冠前后緣均無小鋸齒、叉骨u形、第指第2指節很短、坐骨封閉突極大且具有坐骨后背突、第?骨部分窄足型等，因而無疑應歸入該屬中。