| 名稱 溝通蟲三葉蟲化石 | Name Ductina trilobite fossil |
| 地質年代 泥盘纪 | Geological Age Devonian Period |
| 描述 廣西南丹溝通蟲 (Ductina) 三葉蟲(Trilobite) 化石 Ductina的身體很小，平均長達5厘米。身體沒有任何裝飾。 頭部擋板的寬度是軸線方向的2至3倍。 頭部軸線向前強烈地向前擴展，有淺溝，前部向下彎曲，與軸的平面形成近似直角。另一個淺溝，左右兩個深坑，穿過眉間後部，形成一條窄帶，左前方和右前方有一個小葉，由淺溝和深坑組成。頭部的背部經常被破壞，遮蓋了枕骨環的特徵。眼睛和眼脊不存在。頭腦的天然骨折線與其邊緣重合，因此沒有自由的臉頰。性別角度是圓形的，不是截短的，沒有精靈脊柱。胸部有10個節段，軸的寬度約為胸廓的1/3。 尾部是身體長度的20％至35％。pygidial軸是尖的，在邊界處結束。 | Descriptions The body of Ductina is small to average up to 5 cm. Body without any adornment. The headshield is 2 to 3 times as wide as it is long in the direction of the axis. The cephalic axis is strongly widening forward with shallow furrows, the front curving downward to end at an approximate straight angle to the plain of the axis. Another shallow furrow, with left and right a deep pit, crosses to the back of the glabella to define a narrow band, and just in front left and right a small lobe is defined by shallow furrows and a deep pits. The back of the cephalon is often broken, obscuring the features of the occipital ring. Eyes and eye ridges are absent. The natural fracture lines of the cephalon coincide with its margin, so there are no free cheeks. The genal angles are rounded, not truncated, no genal spine. The thorax has 10 segments, and the width of the axis is about ⅓ of the thorax. Tailpiece is 20 to 35% of the length of the body. The pygidial axis is pointed, ending at the border. |
| 地點 廣西 | Location Guangxi |
| 參考 Reference https://en.wikipedia.org/wiki/Ductina | |
| 編者 由 3B (5) 陳宇晴 於 30/5/2019 編寫 _________ 於17/1/18最後編改 | Editor Created by 3B (5) Chan Yu Ching on 30/5/2019 Last modified by ________ as on 17/1/2018 |
