藏北中侏罗世窗孔类的发现和唇口类的起源(英文)

本文建立了新科 Fenestraporidae及其一个新属 Aviculofenestella和它的两个新种 A.triapertalis,A.que-napertalis被建立和描述了。它们发现于藏北羌塘盆地中侏罗世巴柔期的地层内。新属和限于北美和中亚高加索地区早泥盆世晚期和中泥盆世的已知的窗孔苔虫 (Fenestrapora) ,都显示了似鸟头体的构造。然而 ,新属中所有的这种似鸟头体构造 ,只分布于横枝上。本文也讨论了窗孔苔藓动物和其它各类苔藓动物之间可能的亲缘关系。作者推测 ,窗孔苔藓动物是由隐口苔藓动物的叶孔苔虫 (Parachasmatopora)经中奥陶世的原始的窗孔苔藓动物 Moore-phylloporina发展来的。新属的发现更进一步提供了支持这样一种假设 ,即 :“唇口苔藓动物是由窗孔苔虫经新属鸟头窗格苔虫 (Aviculofenestella)发展来的”假设的重要证据。

中国海的缨鳃虫科(多毛纲、缨鳃虫目) Ⅱ.麦缨虫属

The present study reports three species of Megalomma within Sabellidae (Polychaeta, Sabellida) from China Seas. Except for Megalomma vesiculosum (Montagu, 1815), M. heterops Perkins, 1984 and M. bioculatum (Ehlers, 1887) are the first records from China Seas.

中国沿岸水域养殖贝类及其养殖笼网污损苔虫7新种

This present paper introduces 7 new species,among which 5 are referred to genus Microporella Jullien ,1888,i.e.,Microporella vacuatus sp.nov.,Microporella cribellata sp.nov.,Microporella inermis sp. nov., Microporella antiborealis sp. nov.,and Microporella monilifera sp.nov.;2 are referred to genus Fenestrulina Jullien,1888,i.e.,Fenestrulina sinica sp.nov. and Fenestrulina orientalis sp. nov.. Diagnoses of new family,new genus and new species Microporella vacuatus sp.nov.(Pl.Ⅰ,Figs.1～2) Colony encrusting,yellowish or grey-white,forming an irregularly shaped encrustation.Zooids oval,subhexangular or rectangular,arranged quincuncially,separated by fine sutures.Primary orifice D-shaped,slightly straight proximally,nearly rounded at either proximal corner;with a conspicuous,small condyle at either proximal corner;peristome slightly raised.4～5 oral spines present in ordinary zooid;1 oral spine not concealed at either proximal side of the ovicells or all the oral spines entirely concealed in fertilized zooids.Frontal wall gently convex,coarsely granulated,perforated by small,various-sized,subcircular pores whose inner borders are smooth or has 1～2 denticles.Operculum yellowish,equal to the orifice in shape and size,with a robust,brown sclerite along the arched margin,marked with many granules on the frontal surface. Ascopore circular,cribrate,situated median-proximally to the orifice,separated from proximal edge of orifice by a very short span,with raised outer peripheral margin forming a lowered umbo.Avicularium single,located at one side of the frontal wall,with an entire crossbar;Avicularian chamber expanded and marked with granules;Rostrum triangular,directed laterally,rostral groove slightly curved towards the basal side.Mandible with a setiform distal extension and without a hook at either side.Hyperstomial ovicell globose,longer than wide,embedded basally,marked with a row of marginal pores and a row of radial ribs disto-laterally;frontal surface convex,nodular,with a few small pores scattered over its surface.With basal porechambers,2 distally and 3 disto-laterally.Ancestrulae absent. This new species resembles Microporella elegans Suwa & Mawatari,1998 in the shape of zooid,the presence of the cribrate ascopore,the direction and chamber character of the single avicularium and the appearance of the mandible.But differs from that species in that the frontal pores of the new species not having a cribrate bottom,and that the setiform mandible not having a hook at each side of the base. Microporella cribellata sp. nov. (Pl,Ⅰ,Figs.5;Pl.Ⅲ,Figs.4～5) Colony encrusting,unilaminar,forming a subcircular patch or irregularly-shaped encrustation.Zooids rectangular or subhexangular,arranged quincuncially,separated by distinct sutures.Orifice Dshaped,wider than long,with a nearly straight or slightly concave proximal border and a small,triangular condyle at either proximal corner.Operculum corresponding to the orifice in shape and size,with a small constriction at either proximal corner and with a brown chitinous semicircular sclerite along its arched margin.Oral spines 4～5.Frontal wall convex,finely granulated,perforated by evenly distributed pores whose bottoms have circular cribrate plates.Ascopore circular,cribrate,situated proximally to the orifice,raised and thickened proximally much more than distally to form a suboral umbo.Adventitious avicularium usually single,sometimes double,and located beside the ascopore.Rostrum rounded triangular or semielliptical,directed obliquely to the distal end and without a rostral groove.Mandible rounded triangular or semielliptical.Ovicell hyperstomial,embedded basally,globose,longer than wide,marked with radial ribs and 2～3 rows of small pores along the distal and lateral margin,frontal surface with many minute granules and several dispersed pores. 4～5 oral spines in ordinary zooids,and with one oral spine not concealed at either proximal side of the fertilized zooid.Ancestrula tatiform,elongate oval,with an oval frontal membrane surrounded by an undulate mural rim,with 9