A NEW SPECIES OF RANINOIDES （CRUSTACEA ： DECAPODA ： RANINIDAE） FROM OFF THE SOUTHEASTERN COAST OF HAINAN ISLAND AND NANSHA ISLANDS

Ranlnoides longifions new species, off SE coast of Hainan Island, dorsal surface of carapace with an arched granular edge across carapace between the anterolateral teeth, median frontal tooth longest, second frontal teeth subquadrate.     

北部湾野生长毛明对虾(Fenneropenaeus penicillatus)体重和形态性状的关系

测量北部湾86尾野生长毛明对虾体长、头胸甲长、胸高、胸宽、第一腹节宽、第一腹节高、第三腹节高、额剑上刺数、额剑下刺数和体重等10个性状,采用逐步回归法分析9个性状和体重的关系。结果表明:体长、头胸甲长、胸高、第一腹节宽、第三腹节高和额剑下刺数6个性状与体重的相关系数达到了极显著水平(P<0.01),在单独的决定系数中:头胸甲长对体重的决定系数(14.44%)最大,共同决定系数中,体长与头胸甲长最大为21.13%。通过分析,建立长毛明对虾的体长、头胸甲长、胸高、第一腹节宽、第三腹节高、额剑下刺数对体重的最优理想回归方程,为长毛明对虾选育种和保种提供理想的测度指标。     

A new genus and species of shrimp(Crustacea:Axiidea:Axiidae) from the Caroline Ridge,Northwest Pacific

A new genus and species of axiid shrimp,Carolinaxius kexuae gen.et sp.nov.is described and illustrated based on a single specimen collected from an unnamed seamount in the Caroline Ridge,Northwest Pacific.Although both chelipeds are mis sing,the specimen can be distinguished from other axiid genera by a combination of characteristics:narrowly triangular ro strum;median carina and lateral gastric carina each with one prominent tooth;submedian gastric carinae converging po steriorly,with teeth;cornea weakly pigmented,eyestalk with acute distome sial tooth on dorsal surface;male pleopod 1 two-articled;pleopod 2 with appendix interna and appendix masculina;pleopods 3-5 with appendix interna.The molecular phylogeny suggests the new genus is most closely related to another recently described genus living inside hexactinellid sponges on seamounts in the Indian Ocean,Montanaxius Dworschak,2016.However,it differs from Montanaxius in the shape of the rostrum,the arrangement of teeth on the carapace,and the shape of the eyestalk.Besides,the significant molecular differences support the two belonging to different genera.     

Two new species of the genus Munidopsis Whiteaves,1874(Crustacea:Anomura:Munidopsidae) from the Caroline Ridge,South of the Mariana Trench

The genus Munidopsis has high biodiversity in seamount habitats.In this study,two new Munidopsis species,Munidopsis ahyongi sp.nov.and Munidopsis carolinensis sp.nov.from the Caroline Ridge in the tropical western Pacific Ocean were described.M.ahyongi sp.nov.is very similar to a group of species in the M.serricornis complex,but can be readily distinguished from the related species in having the oblique posterior orbital margins,2 spines on the lateral carapace margin,and a relatively longer rostral median spine.M.carolinensis sp.nov.is different from two related species primarily in having oblique frontal margins,blunt outer orbital angles,straight lateral margins of the rostrum,scale-like rugae on sternites 5-7,and less spinose pereopod 1(chelipeds,P1) merus and carpus.Aside from the morphological comparisons,DNA barcode analysis and phylogenetic analysis based on the cytochrome c oxidase subunit I gene(COI) were employed for the identification of these new species.     

军曹鱼骨骼系统的研究

对军曹鱼骨骼系统进行了系统研究。结果表明军曹鱼有发达的额骨、鼻骨和上耳骨,犁 骨、腭骨具齿,左右顶骨被上枕骨分开,具背肋和腹肋,无眶蝶骨,头部有些骨骼左右不对称。     

MORPHOLOGICAL CHANGES IN DEVELOPMENT OF PHARYNGEAL TEETH IN MYLOPHARYNGODON PICEUS

Adult pharyngeal teeth in Mylopharyngodon piceus are molariform. Based on SEM observations ofthe developing teeth, this paper describes the morphological diversification of pharyngeal teeth in M.piceus. The larval and juvenile teeth are changed from conical to adult molariform teeth through sevenstages. Comparisons are made between each stage and corresponding types in some species of differentsubfamilies in Cyprinidae. It is considered that the ontogenetic resemblances of the pharyngeal teehbear relationship to the phylogeny of cyprinids.     

A new species ofPraebebalia (Crustacea: Brachyura: Leucosiidae) from East China Sea

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｇｅｎｕｓＰｒａｅｂｅｂａｌｉａｗａｓｅｓｔａｂｌｉｓｈｅｄｂｙＲａｔｈｂｕｎ ,1 91 1 .Ｉｔｓｃａｒａｐａｃｅｉｓｂｒｏａｄｅｒｔｈａｎｌｏｎｇａｓｌｏｎｇａｓｂｒｏａｄ ,ｏｒｓｌｉｇｈｔｌｙｌｏｎｇｅｒｔｈａｎｂｒｏａｄ ;ｔｈｅｐｏｓｔｅｒｉｏｒｂｏｒｄｅｒｉｓｕｓｕａｌｌｙａｒｍｅｄｗｉｔｈａｓｐｉｎｅｏｒｔｕ ｂｅｒｃｌｅｏｎｅａｃｈｓｉｄｅ ,ｔｈｅｈｅｐａｔｉｃａｎｄｉｎｔｅｓｔｉｎａｌｒｅｇｉｏｎｓａｒｅｄｉｓｔｉｎｃｔｌｙｅｌｅｖａｔｅｄ ;ｔｈｅｃｈｅｌ…     

First record of marine crab, Eucrate alcocki Ser6ne, in Ser6ne and Lohavanijaya, 1973 （Crustacea, Decapoda, Brachyura, Euryplacidae） from India

This paper reports the occurrence of a marine brachyuran crab species Eucrate alcocki Serène, in Serène et al., 1973, of the family Euryplacidae Stimpson, 1871, for first time from India, based on a male specimen from Parangipettai fish landing centre in Bay of Bengal, Southeast Coast of India. Although morphologically corresponding with what is currently defined as E. alcocki, the color pattern of the carapace of the present specimen is rather different from that of the Chinese material-only the anterior fifth of the carapace is marked with scattered red spots, the rest of the surface is yellowish, with four unusually shaped red blotches which almost look like Sanskrit characters.     

Genetic improvement on Chinese shrimp （Fenneropenaeus chinensis）： growth and viability performance in F1 hybrids of different populations

Fenneropenaeus chinensis distributed in the Yellow Sea and Bohai Sea of China and the west coast of the Korean Peninsula. Different geographical populations represent potentially different genetic resources. To learn further the characteristics of different geographical population, crosses among two wild and three farmed populations were produced. The two wild populations were from the Yellow Sea and Bohai Sea (WYP), and the west coast of the Korean Peninsula and coast (WKN). The three farmed populations included the offspring of first generation of wild shrimp from coast in Korea (FKN), the Huang Hai (the Yellow Sea in Chinese) No. 1 (HH 1), and JK98. The phenotypes growth and survival rates of these populations were compared to confirm the feasibility for crossbreeding. The body length (BL), carapace length (CL), carapace width (CW), height of the second and third abdominal segment (HST), width of the second and third abdominal segment (WST), length of the first abdominal segment (LF), length of the last abdominal segment (LL), live body weight (BW), and survival rate were measured. Different combinations were statistically performed with ANOVA and Duncan's Multiple significant difference (P<0.05) in BL, CL, HST, LL, and BW; and insignificant difference (P0.05) in other growth traits and survival rate. The results of Duncan's Multiple Range Test are that BL and CL of was the best combination in all growth traits. Therefore, hybridization can introduce the variation to base populations. The systematic selection program based on additive genetic performance may be more effective than crossbreeding.     

秦岭俯冲板块前缘石炭纪构造-沉积环境

石炭纪处于秦岭南、北板块由俯冲到全面碰撞的重要阶段。在俯冲板块前缘,石炭系发育在两种不同类型的沉积盆地之中。前缘南带盆地的形成与俯冲板块边缘弯曲而导致的浅层水平伸展有关,前缘北带主要为一些小型残余盆地,并明显遭受定向滑移构造的改造。两种不同沉积作用演化是在不同的构造过程中形成的。     

用矩阵求解球与圆柱的相贯线

本文利用矩阵求解球和圆柱的轴线处于各种相对位置时,相贯线的矩阵表示。并讨论相贯线在水平(H)面,侧立(W)面,正立(V)面上的投影线。     

ORBIT OF THE BOWHEAD WHALE, BAIAENA MYSTICETUS

INTRODUCTIONThehoweadwhales(Bahaamyticeus)areveryiInPOrtantsPeciesinthetraditionandctiltmeoftheEskimoPeoPle,whohuntthemeveryyear,andhaveagredtoallowsomesPecimenstobecollectedfromharVested(forsubsistence)boweadwhalesforscien-tificresearehpUrpOses.StudiesontheothitofthebOweadwhalearefewandfarbetWeen.unanisANDMrmODTheorbitsofttheboweadwhaleskulls(87B6,9oB11,94B12)keptinNorthSlopeBorough,Barrow,Alaska,U.S.A.lwereobservedinsitu.asSULrsTheorbitisacavitywhichenclosestheeyeball,witht…     

广西金牙金矿床原生地球化学异常特征及其找矿意义

广西金牙金矿床是一种浊积岩容矿、滑塌挤压复合断裂控矿的微细粒浸染型金矿床。本文通过大量岩石样品分析数据处理,对矿床原生地球化学异常特征探讨。认为:该矿床以发育Au、As、Sb、W、Hg等元素异常为特征,其原生晕的形态和空间展布较明显地受赋矿断裂构造所控制,基本上与矿体形态相吻合,故Au—As—Sb—W—Hg组合异常为典型的矿体晕;Hg异常也表现为一定程度的前缘晕特征。据此,建立了本区的找矿模式和找矿标志。     

Morphological changes in development of pharyngeal teeth inMylopharyngodon piceus

Adult pharyngeal teeth inMylopharyngodon piceus are molariform. Based on SEM observations of the developing teeth, this paper describes the morphological diversification of pharyngeal teeth inM. piceus. The larval and juvenile teeth are changed from conical to adult molariform teeth through seven stages. Comparisons are made between each stage and corresponding types in some species of different subfamilies in Cyprinidae. It is considered that the ontogenetic resemblances of the pharyngeal teeth bear relationship to the phylogeny of cyprinids. This project was funded by the International Cooperation of Japan—China and the National Natural Science Foundation of China     

APPEARANCE PATTERN OF TOOTH GERMS WITH DEVELOPMENTAL PROCESS IN MYLOPHARYNGODON PICEUS

The pharyngeal dental formula of Mylopharyngodon piceus is 4-5 as a rule, and the dentition isasymmetrical. It is difficult to identify each tooth in the larval dentition. In this paper the appearancepattem of tooth germ with developmental process in this fish is described in detail. The formationpattern of the left dentition is contrasted with that of the right one. In the developmental process,the left pharyngeal dentition lacks teeth at position An3. Thus the left dentition is D-type as designatedby Nakajima(1984), while the right one is A-type.     

Nemerteans of Zhoushan Islands,East China Sea coast,China II. Enopla: Distromatorhynchocoela: Monostilifera: Tetrastemmidae

A new monostiliferous hoplonemertean,Psammamphiporus microocelli sp. nov., is described. It differs from the single species of genusPsammamphiporus, P. elongatus, in being without a frontal organ and cephalic furrows, the stylet basis being conical rather than cylindrical. The project supported by National Natural Science Foundation of China.     

Effects of fishes on the growth and survival of Chinese mitten crab,Eriocheir sinensis

This experiment on the effects of fishes (Pelteobagrus fulvidraco, Channa argus, Cyprinus carpio) on growth and survival of juvenile Chinese mitten crab,Eriocheir sinensis was conducted in cages placed in Bao'an Lake. T-tests showed that effects of fishes on the carapace width growth were not significant as compared with the control (no fish). But the effects of these fishes on crab survival were negative. The causes of negative effects of fishes on crab survival were simply discussed on the basis of food habits. This research was financially supported by the Department of Agriculture (96-008-02-03), P. R. China, and Chinese Academy of Sciences (Key Project: KZ951-A1-102).     

川西北前陆双鱼石地区砂箱物理模拟及其油气地质意义

基于川西北前陆双鱼石地区地震构造解释和砂箱物理模拟实验等，揭示川西北前陆盆地构造变形特征、过程与形成演化机制。标准模型、标准地层模型和断坪-断坡结构模型物理模拟实验揭示出川西北双鱼石地区具有双重构造扩展变形特征，受底部滑脱层系和断坡结构带联合控制，其深部物质变形形成典型冲起构造。断坡结构带对上覆下古生界构造变形及其断裂发育具有重要控制作用，部分断裂体系易于形成高效的下寒武统筇竹寺组源岩-古生界储层“源-储”输导体系。前陆扩展变形带逆断层与相关冲起构造易于形成深部隐伏的双重构造，前陆盆地隐伏构造由新生代晚期构造扩展变形形成，但其构造变形相对较弱，因而具有较佳的晚期油气保存富集条件。“自然界原型到实验模型”的砂箱物理模拟为解译前陆盆地演化过程及其油气富集等提供了独立有效的手段。      

Design principle for parameters and interferences of tungsten carbide insert interface on roller bits

The lifetime of roll-bits with inserted tooth will be obviously decreased while drilling in strata and the tungsten carbide can be integrally separated from the roll-cone,which will need more trip out time to replace the roller bit.This study provides an entire analysis on stress as well as strength for teeth and tooth holes in loaded conditions.Qualities of tooth drop from matrix within roller bit.The optimized interferences of teeth inserted into the bit can be reasonably obtained by the critical interference derived from some relevant influence factors on the tooth-fixing quality of roller bits.     

浙江羚羊头骨化石的发现与研究

本文论述了1992年采自浙江开化的一件羚羊头骨化石。标本经记述对比研究后，认为它代表了GazelleBlaimville的一个新种，命名为开化羚羊（新种）Gazellekaihuaensissp．nov，时代也属于晚更新世。尚系浙江首次发现，这对羚羊的分布范围及其古地理、古环境等方面的研究具有一定的意义。