摘要
本文报道澄江生物群似斜纹海绵属Paradiagoniella的两个新种:橄榄形似斜纹海绵P.oliviformis sp. nov.和锥形似斜纹海绵P.conica sp. nov.。两个新种具有似斜纹海绵属的基本特征:体壁薄;由排列不规则、分级的十字骨针为基底构成骨骼;除十字骨针外,还穿插排列有五射针、六射针、弯弓形和针形双尖单轴针等。然而与模式种不同,两个新种十字骨针分级不明显;同时,两个新种在外形、骨针组成、最大十字骨针射长比等方面,与本属的其他种都存在明显差异。新材料的发现增加了寒武纪早期原始海绵物种多样性,为研究海绵动物早期起源演化提供了新信息。
Two new species of Paradiagoniella collected from the Chengjiang biota,Paradiagoniella oliviformis sp.nov.and P.conica sp.nov.,are reported here.Similar to P.magna(type species)and P.xiaolantianensis they are thin-walled sponge with dense mesh of stauractines and a minor amount of oxeas(straight or curveddiactines)to form the main skeleton;Rare hexactine or pentactine may also be present;Stauractines ranked in size.But they can be distinguished from the type species by the rank-less stauractines.The two new species differ in many features,such as the overall form of body and the composition of spicules.These new materials suppose that protospongiid sponges have a high diversity in the early Cambrianperiod and provide new information for understanding the evolutionary significance of protospongiids and the early evolution of hexactinellids and siliceans.
作者
马海丹
杨继媛
陈爱林
侯先光
唐烽
MA Haidan;YANG Jiyuan;CHEN Ailin;HOU Xianguan;TANG Feng(Yuxi Normal University,Yuxi,Yunnan,653100;MEC International Joint Laboratory for Palaeobiology and Palaeoenvironment,Kunming-,650091;State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing,210008;Yunna Key Laboratory for Palaeobiology,Yunnan University,Kunming,Yunnan,650091;Institute of Geology,Chinese Academy of Geological Sciences,Beijing,100037)
出处
《地质学报》
EI
CAS
CSCD
北大核心
2019年第11期2715-2728,共14页
Acta Geologica Sinica
基金
国家自然科学基金项目（编号41662003
41572024）
云南省创新团队项目（编号2015HC029）
现代古生物学和地层学国家重点实验室（中国科学院南京地质古生物研究所）项目（编号193104）
地质调查工作项目（DD20190008）联合资助
