(34)管刺屬

SiphonognathusBransonandMehl,1934;BransonandMehl,1944Siphonodella(Eosiphonodella)Ji,1985Siphonodella(Siphonodella)BransonandMehl,Ji,1985模式種:SiphonodelladuplicataBransonandMehl,1934特征:齒臺(tái)矛狀,不對(duì)稱,高高拱起,拱起的頂點(diǎn)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] >>