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地质科学  1985, Vol. Issue (4): 364-374    DOI:
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鄂西利川晚二叠世生物礁中串管海绵(Sphinctozoa)化石的新发现
张维
中国科学院地质研究所
NEW FINDING OF SPHINCTOZOA FROM LATE PERMIAN REEFS IN LICHUAN, W. HUBEI, CHINA
Zhang Wei
Institute of Geology, Academia Sinica, Beijing
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摘要 湖北省西部利川县境内的上二叠统发育有我国最典型的生物礁。礁体产于长兴组二段(含古纺锤(竹蜓) Palaeofusulina 带),以见天坝一带出露最佳。1977—1978年,江汉石油学院刘怀波、高振中等报道了黄泥塘生物礁的发现,并对该区生物礁的组成、形成环境提出了看法。1980—1982年,中国科学院地质研究所、四川石油管理局地质勘探开发研究院、江汉石油学院及江汉石油管理局等曾先后赴见天坝考察,并分别进行深入详细的研究,一致确认该区生物礁是以钙质海绵为主要造架生物的、晚二叠世碳酸盐台地边缘生物礁。
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张维
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Abstract: Abundant Late Permian Sphinctozoa fossils have been collected from several localities in Lichuan, West Hubei, China. These fossils and various binding organisms comprise the frame-builders of the typical reef of this district. Here, the Sphinctozoans consists of 14 genera and 33 species belonging to 6 families.The new family Stromatocoeliidae and the new genera Stromatocnelia, Sinocoelia, Lichuanospongia are briefly diagnosed as following:Stromatocoeliidae n. fam.Diagnosis: Sponge body is columnar or irregularly columnar, composed of very low, stratiform chambers. Branching stems are common. Walls of chambers are pierced by pores but no ostia are visible in it. A central tube traverses the axial position of stems. Filling tissue does not occur.Remarks: The new family possesses chambers and a central tube, which are most important features of sphinctozoans. All of the chambers are stratiform, and one su- perposed above the other. Chamber interiors lack filling structures.Stromatocoelia gen. nov.Type-species: Stromatocoelia asiatica gen. et sp. nov.Diagnosis: Regularly or irregularly columnar compound stems, consisting of very low. stratiform chambers with one superposed above the other. The central tube can be seen in the axial position of stems. No filling tissue occur in chambers or in central tube.Discussion: The new genus Stromatocoelia is similar to Sinocoelia that belongs to the family Verticillitidae. Though both sponges are composed of stratiform chambers, they are. placed in different groups because of differences in their filling tissue.Sinocoe Ua gen. uov.Type-species: Sinoc.oclia-lepida gen. et sp. nov.Diagnosis: This genus includes pocket-like or elongate sponges with an elliptical flattened cross section, with a flat but laterally very expanded central spongocoel. The spongocoel is of pseudosiphonal type. Chambers are stratiform. The interior of the sponge is occupied by reticular structures. Pores are well developed and often form pore-openings.Discussion: The new genus is placed in the family Verticillitidae, because of the character of filling structures a,nd the nature of central spongoeoel. They are much like specimens of Vcrticillites Steinmann, 1882 but differ from the latter in their pock-ket-like shape and very expanded central spongocoel. Dictyococlia (Minister, 1841) and other related forms have spherical or subspheroidal chambers and typical pseudosiphonal type spongocoel.Species assigned: Sinocoelia variabilis sp. nov. in addition to the type-species.Lichuanospongia Zhang, 1983 Type-species: Lichuanospongia typica Zhang, 1983 Diagnosis: This genus has cylindrical or subcylindrical, cone-like, occasionally bending bodies. A central tube traverses the entire axial portion and is of retro-type with a rather thick tube-wall. The chambers are flat, like a crescent form and their arrang-ment shows an overlap of scales in tangential section. The chamber walls consist of two layers and have pores. Vesiculae rarely occur in the chambers. Vermiform openings can be seen in the tube-wall.Discussion : Lichuanospongia differs from Amblysiphonella in having a more distinct arrangement of chambers, which are flat, like some crescent form and show an overlap of scales. The interior of Amblysiphonella is more or less vesiculate or lamellar te, which is not the case with Lichuanospongia in which filling structure are always few and scattered. Furthermore, Lichuanospongia appears to have a double wall structure and its pores are limited, whereas Amblysiphonella has a large number of pores.Cystaulctes is also related but differs from Lichuanospongia in the shape of chambers and their arrangement.Species assigned: Lichuanospongia cf. typica and L. orientalis sp. nov. in addition to the type-species.
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收稿日期: 1984-02-08;
引用本文:   
张维. 1985, 鄂西利川晚二叠世生物礁中串管海绵(Sphinctozoa)化石的新发现. 地质科学, (4): 364-374.
Zhang Wei. NEW FINDING OF SPHINCTOZOA FROM LATE PERMIAN REEFS IN LICHUAN, W. HUBEI, CHINA[J]. Chinese Journal of Geology, 1985, (4): 364-374.
 
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