(34)管刺属

SiphonognathusBransonandMehl,1934;BransonandMehl,1944Siphonodella(Eosiphonodella)Ji,1985Siphonodella(Siphonodella)BransonandMehl,Ji,1985模式种:SiphonodelladuplicataBransonandMehl,1934特征:齿台矛状,不对称,高高拱起,拱起的顶点就在基腔的上方或近于基腔的上方。除早期种 ......（本文共 6256 字 ）     [阅读本文] >>