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1.
记述了辽宁阜新县大五家子镇三吉窝铺的鱼化石。该鱼具有颞孔 ,前上颌骨小 ,上颌骨大 ,辅上颌骨 1块 ,口缘有一行锥形齿 ,背鳍小于臀鳍 ,1 6根分叉尾鳍条 ,尾下骨 7块 ,尾上骨 1块 ,尾神经骨 3~ 4块。这些特征基本上是狼鳍鱼的定义特征 ,因此 ,应该属于狼鳍鱼属。阜新标本的第三眶下骨呈半圆形 ,不同于狼鳍鱼属各已知种。阜新标本的下颌长而低 ,在狼鳍鱼属中 ,只有三棵榆树狼鳍鱼和德永氏狼鳍鱼的下颌与之相似。但阜新的标本在具有 1 0根胸鳍主要鳍条、1 6根尾鳍分叉鳍条以及 1块尾上骨方面不同于三棵榆树狼鳍鱼。与德永氏狼鳍鱼相比 ,阜新标本的第三眶下骨小、半圆形、后端不伸达前鳃盖骨的前缘 ,辅上颌骨较大 ,身体较宽。根据上述阜新标本的特征 ,建立狼鳍鱼属一新种———阜新狼鳍鱼。  相似文献   

2.
关于董氏狼鳍鱼(Lycoptera tungi)的种上归类   总被引:2,自引:6,他引:2  
本文重新研究了董氏狼鳍鱼 (Lycoptera tungi Liu et al 1963).将产自宁夏隆德石窑寺的董氏狼鳍鱼 V2323 号标本从狼鳍鱼属 (Lycoptera) 中分出来,归入华夏鱼属 (Huashia), 修定为董氏华夏鱼 (Huashia tungi (Liu et al.)).同时对华夏鱼科 (Huashiidae) 的系统位置作了初步讨论.  相似文献   

3.
本文对辽宁西部的长头狼鳍鱼的形态特征进行了补充和订正,记述了其形态变异,将长头狼鳍鱼(LycopteralongicephalusLiuetal.1963)厘订为长头吉南鱼(Jinanichthyslongicephalus(Linetal.1963)),并认为辽西鱼属(Liaoxiichthys)是吉南鱼属的同物异名,讨论了吉南鱼的分类位置和演化趋势。  相似文献   

4.
5.
本文对辽宁西部的长头狼鳍鱼的形成特征进行了补充和订正,记述了其形态变异,将长头狼鳍鱼(Lycoptera longicephalus Liu et al.1963)厘订长头吉南鱼(Jinanichthys longicephalus(Liu et al.1963)),并认为辽西鱼属(Liaoxiichthys)是吉南鱼属的同物异名,讨论了吉南鱼的分类位和演化趋势。  相似文献   

6.
本文记述了辽东聂尔库组所产的骨舌鱼超目二新属——聂尔库鱼(Nieerkunia gen. nov.)、苏子鱼(Suziichthys gen. nov.)和狼鳍鱼科(Lycopteridae)属种未定的材料.文中将长头狼鳍鱼(Lycoptera longicephalus)订正为狼鳍鱼科—新属——辽西鱼(Liaoxiichthys gen. nov.),并认为聂尔库组的鱼群不同于九佛堂组的鱼群,时代属早白垩世.  相似文献   

7.
黄颡鱼、大鳍鳠消化道粘膜的扫描电镜观察   总被引:2,自引:0,他引:2  
林仕梅  罗莉  叶元土 《四川动物》2003,22(2):63-65,F002
利用扫措电镜对黄颡鱼、大鳍鳠的消化道粘膜的形态结构进行了观察和比较。  相似文献   

8.
软鳍新光唇鱼(Neolissochilus benasi)的人工繁殖与胚胎发育   总被引:1,自引:0,他引:1  
2009—2011年,使用促黄体素释放激素类似物(LHRH-A2)及马来酸地欧酮(DOM)混合催产剂共催产软鳍新光唇鱼(Neolissochilus benasi)雌鱼60尾及雄鱼100尾,其中,雌鱼成功47尾(78.3%),雄鱼成功92尾(92.0%)。雌鱼产卵量为1 986~5 854粒/尾,卵径为2.2~2.8 mm,平均核偏位率为73.2%。精子密度为(16.32±2.89)×109个/ml,鲜精平均活力为(60.6±3.2)%,平均寿命为(70.2±5.3)s。胚胎发育过程需120 h,分为受精卵期、分裂期、囊胚期、原肠胚期、体节期和孵化期等6个阶段,平均孵化率为32.4%,45日龄仔鱼存活率为86.5%。胚胎发育过程中,畸形部位主要为口部、胸腔、脊索和眼部,且以脊索畸形较为常见,卵黄蘘吸收异常及双头亦为畸形表现形式。在上述数据的基础上,分析了软鳍新光唇鱼畸形的原因,并提出在亲鱼培育过程中应尽量提供适合的养殖条件,最大限度降低捕获诱发的压力,以提高繁殖效率。  相似文献   

9.
记述了采自内蒙古锡林郭勒盟的水狼蛛属Pirata一新纪录种,盗水狼蛛Pirata praedo Kulczyński,1885。提供了该种外生殖器手绘图和显微照片,同时也给出了其近似种——真水狼蛛Pirata piraticus(Clerck,1757)的显微照片。标本现保存于西南大学生命科学学院。  相似文献   

10.
记述了辽宁西部九佛堂组和义县组中华弓鳍鱼一新种:辽宁中华弓鳍鱼Sinamia liaoningensis,并与该属的其他种进行了比较.新材料具有中华弓鳍鱼科的3个定义特征:单一的顶骨,三对额外肩胛骨和膜质翼耳骨短并与顶骨等长,无疑应归入该科.新种的后眶下骨较小,背鳍长大,鳞片菱形,因此,归入中华弓鳍鱼属.辽宁中华弓鳍鱼在以下几个方面不同于中华弓鳍鱼的5个已知种:体型短粗,吻骨较短,鼻骨近四方形,围眶骨较多(6),前鳃盖骨强烈弯曲,背鳍条较少(18),尾鳍条较多(16),臀鳍鳍基起点到鱼体背缘的鳞列较多(32),鳞片后缘不具锯齿,尾鳍具有纤维状的角质鳍条.  相似文献   

11.
icephalusLiuetal.l963isemendedt0Jinanichthyslongiccphalus(Liuetal.)-Li-aoxiichthysSul992isconsideredasasyn0nymofJinanichthys-Theev01utionarytrendandsystematicpositionofJinanichthysarediscussed.l.Revi8ionofthecharactersofJinarrichthysBodyfusiform;ratioofbodyheighttobodylengthvariable;nasalsslenderandsmall;frontals10flg;parietalsrelativelylarge;supra0ccipita1relativelyroundandnotseparateparieta1s;supraorbitalsens0rycanalceasinginthemiddlepartoftheparie-talandnotlinkingwithsub0rbitalsens0rycan…  相似文献   

12.
薄鳞鱼类化石的新发现及其地层意义   总被引:1,自引:1,他引:1  
本文记述了薄鳞鱼类(leptolepids)一新属新种——罗家峡隆德鱼(Longdeichthys luojiaxiaensis gen.et sp.nov.)。它和广泛分布于我国北方的另一原始真骨鱼类狼鳍鱼(Lycoptera)共生。因而,为研究真骨鱼类的演化和确定我国北方中生代含鱼岩系的时代及地层对比上,提供了新的资料。  相似文献   

13.
Abstract A new genus and two new species of short-horned flies are described: Alleremonomus xingi gen. etsp. nov., Allwemononus liaoningensis gen. etsp. nov. They are assigned to the extinct family Ere-mochaetidae within the suborder Brachycera of Diptera. They were extracted from the Late Jurassic sediments of Beipiao City, Liaoning Province.  相似文献   

14.
本文记述短角亚目1新属Alleremonomus,2新种:Alleremonomus xingi sp.nov,Alleremonomusliaoningensis sp.nov,其分类位置归于双翅目、短角亚目、独须虻科(Eremochaetidae).化石采自辽宁北票晚侏罗世沉积物中.对独须虻科的化石记录作了简要的回顾.  相似文献   

15.
晚侏罗世摇蚊科新属、种   总被引:3,自引:0,他引:3  
张俊峰 《古生物学报》1991,30(5):556-569
本文描述了我国冀北和鲁东上侏罗统摇蚊科化石3属、3种,其中,1新属和3新种。冀北大北沟组中不存在Chironomaptera gregaria种化石,以前被鉴定为幽蚊科的这个种实际上应为摇蚊科的1个新种。并对如何区分上侏罗统这两个科成虫化石作了简述。  相似文献   

16.
Abstract:  A new genus and species of diplodocid sauropod (Sauropoda, Diplodocoidea), Australodocus bohetii , is described. The type material from the Upper Jurassic (Tithonian) Tendaguru Beds of Tanzania, East Africa, consists of two successive mid-cervical vertebrae. These vertebrae do not show the extreme elongation of the cervical vertebrae that is diagnostic for Tornieria , and, apart from proportional differences, exhibit four autapomorphic characters not seen in other diplodocids: (1) pleurocoel weakly developed; (2) ridge posterolateral to the anterior condyle strongly posteroventrally orientated; (3) triangular pneumatic cavity ventral to the prezygapophysis, enclosed by the lateral ramus of the centroprezygapophyseal lamina and an anteriorly extended prezygodiapophyseal lamina; and (4) prominent prezygapophyseal process pointed, laterally keeled and surpassing the prezygapophysis anteriorly. Australodocus bohetii is the second diplodocid known from Tendaguru, and thereby the second diplodocid known from Gondwana. This impedes the customary reference of isolated East African diplodocid material to Tornieria , which can now only be assigned to Diplodocidae indet. The find supports previously proposed vicariance models of diplodocid palaeobiogeography.  相似文献   

17.
《Palaeoworld》2016,25(1):84-94
A dinosaur tracksite at Hemenkou (Shuangbai County, Yunnan Province) in the ?Middle–Upper Jurassic Shedian Formation that consists mainly of gray-purple feldspathic quartz sandstones was previously reported incorrectly as being in the Lower Cretaceous Puchanghe Formation. The previous assignment is also inconsistent with two regional geological maps. Although mostly yielding poorly preserved tracks, the site nevertheless indicates a diversity of theropod and sauropod trackmakers partly consistent with the Late Jurassic body fossils from the region. Purported ornithopod are re-evaluated here as those of theropods. The theropod tracks and trackways show distinct similarities to those of the GrallatorEubrontes plexus and can be subdivided into three morphotypes that may reflect different pes anatomy and/or substrate conditions. Two sizes of tracks (small, large) indicate the presence of different size classes or species in this area in the Late Jurassic. Similarly, the sauropod trackways document three differently sized trackmakers (small–medium–large) showing a typical wide-gauge (Brontopodus) pattern. The track record is the first evidence of theropods in the ?Middle–Late Jurassic of central Yunnan, whereas the sauropod tracks suggest a relation to the coeval basal eusauropods known from this region by skeletal remains.  相似文献   

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