First discovery of the siliceous sponge spicules from the Middle Triassic Luoping Biota, Yunnan Province
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摘要:
在云南罗平生物群中新发现的硅质海绵骨针化石, 包括单轴骨针和四轴骨针两大类, 其中四轴骨针包含后三叉骨针、前三叉骨针和棘状骨针3种类型。海绵骨针形态保存完整, 并发育微细的轴管构造。扫描电镜能谱(EDS)分析表明, 骨针的构成成分为Si和O元素。骨针的形态类型和组成元素表明, 它们属于普通海绵纲。海绵骨针在罗平生物群化石库中的发现, 显示海绵动物也曾是该生物群中的一员, 丰富了此生物群门类的多样性。
Abstract:Two types of siliceous sponge spicules have been discovered from Luoping Biota from Yunnan Province, southwest China, including the monaxons and tetractines which contains anatriaene, protriaene and calthrops three forms.The spicules are well-preserved with the micro-structure of axial canal.The spicules are composed of the elements of silicon and oxygen by testing with Energy Dispersive Spectrometer (EDS).The element compositions and the types of the spicules indicate that they belong to the Demospongea.These fossil spicules are the first reported in Luoping Biota, they indicate that the sponges used to live together with other fossils in Luoping Biota, and increasing the diversity of this biota.
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Key words:
- Middle Triassic /
- sponge spicules /
- Luoping Biota /
- Yunnan Province
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