SiphonognathusBransonandMehl,1934;BransonandMehl,1944Siphonodella(Eosiphonodella)Ji,1985Siphonodella(Siphonodella)BransonandMehl,Ji,1985模式種:SiphonodelladuplicataBransonandMehl,1934特征:齒臺矛狀,不對稱,高高拱起,拱起的頂點就在基腔的上方或近于基腔的上方。除早期種 (本文共 6256 字 ) [閱讀本文] >>