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Acila divaricata (Hinds, 1843) and A. mirabilis (Adams and Reeve, 1850) are common benthic bivalves in China. A number of researchers have proposed that the latter species is a junior synonym of the former species. Because of morphological similarities, it is difficult to distinguish these two species based on visual examination only. For better understanding of their taxonomy, the mitochondrial COI gene fragments of five individuals of A. divaricata from the East China Sea and six individuals of A. mirabilis from the Yellow Sea were sequenced in this study. The phylogenetic relationships of the obtained COI sequences, together with nineteen sequences of three species of the genus Nucula, were analyzed. The pairwise intra- and inter-specific distances for the COI sequences ranged from 0.002 to 0.017 and from 0.128 to 0.134, respectively, and no overlap was found. Phylogenetically, A. divaricata and A. mirabilis form distinct clades and cluster into a sister to all other Nucula species. The results indicated that A. divaricata and A. mirabilis are two distinct species. The differences in the morphology and distribution between the two species were briefly discussed. 相似文献
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《青岛海洋大学学报(英文版)》2014,(2):283-289
Acila divaricata （Hinds, 1843） and A. mirabilis （Adams and Reeve, 1850） are common benthic bivalves in China. A number of researchers have proposed that the latter species is a junior synonym of the former species. Because of morphological similarities, it is difficult to distinguish these two species based on visual examination only. For better understanding of their taxon-omy, the mitochondrial CO1 gene fragments of five individuals of A. divaricata from the East China Sea and six individuals of A. mirabilis from the Yellow Sea were sequenced in this study. The phylogenetic relationships of the obtained COI sequences, together with nineteen sequences of three species of the genus Nucula, were analyzed. The pairwise intra- and inter-specific distances for the CO1 sequences ranged from 0.002 to 0.017 and from 0.128 to 0.134, respectively, and no overlap was found. Phylogenetically, A. divaricata and A. mirabilis form distinct clades and cluster into a sister to all other Nucula species. The results indicated that A. di-varicata and A. mirabilis are two distinct species. The differences in the morphology and distribution between the two species were briefly discussed. 相似文献
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于１９５９年１２月１４日在南海进行的全国海洋综合调查时,采到了一个罕见的双壳类标本。最近经过鉴定,认为是一个新种,属于双带蛤科、糙双带蛤属,定名为中华糙双带蛤。模式标本保存于中国科学院海洋研究所。 相似文献
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An assemblage of geoduck clam shells from the marine environment of coastal British Columbia was studied. Shells were cut
and the widths of internal shell growth increments, annuli, were measured from the hinge plate. The largest shells showed
more than one hundred annual increments. Shell growth exhibited juvenile maxima at ontogenetic ages 3–6 years. The growth
maximum was followed by a distinct decline that continued until the death of each individual. Further, this ontogenetic growth
trend was mathematically removed from the data in order to examine growth variations other than ageing. The longest growth
records from the oldest shells were compared to monthly indices of the Pacific Decadal Oscillation (PDO). It was found that
the PDO exerts the strongest influence on the shell growth during the very start of the growing season, in February and March.
We also detected increased magnitude of growth variations towards the end of the 20th century. Similar trends were apparent
in the PDO record. Moreover, the shell specimen displaying the strongest trend of increasing variance had the strongest PDO-linked
regional growth signal. Our results support the view that PDO exerts a governing influence on the biological and ecological
system along Northeast Pacific coastal areas. Incorporation of geoduck shell growth increment analyses into multi-disciplinary
studies dealing with palaeoceanography and archaeology is suggested as a promising future approach. 相似文献
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报道了中国南沙群岛的双壳纲贝类141种,分隶于5亚纲8目36科77属.从种类的组成中,帘蛤科有18种,蚶科15种,扇贝科11种,鸟蛤科10种,锉蛤科8种,贻贝科、海菊蛤科和樱蛤科各7种,砗磲科6种,其他各科的种类均在5种以内.按种的性质而论,大多数属于和珊瑚礁有密切联系的热带种或亚热带种,区系性质为印度-西太平洋区的印尼-马来亚区. 相似文献
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非海相双壳类江西蛤（Jiangxiella）首次发现于日本 总被引：2，自引：0，他引：2
首次报道日本西南部发现的晚三叠世非海相双壳类江西蛤（Jiangxiella)，并讨论这一发现的意义。认为原产于湘、赣、粤地区的江西蛤是地理分布极有限的土著属，它在日本西南部的发现表明当时该区与华南东部的古地理关系极为密切，可能原属同一地块。 相似文献
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近百年来,中国化石双壳类的研究经历了从无到有,从基础资料的积累到向基础理论方向发展和关门自守到走向世界的过程,逐渐摆脱了“标准化石”和从属地位,走上古生物学发展的道路。新中国成立后,经过我国几代双壳类古生物学工作者们的努力,中国各地质时期的双壳类组成总貌和双壳类化石的层序地层学已经得到揭示和确定,双壳类的起源、演化、埋葬、古生态和古生物地理学也受到不同程度的研究或探讨。双壳类古生物学已经并正在积极而有效地指导或支持地质生产。顾知微院士是我国化石双壳类学科最重要的承传和奠基人。 相似文献
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我国重要帘蛤科(Veneridae)贝类的16S rRNA序列系统学分析 总被引：5，自引：0，他引：5
本文对我国隶属于帘蛤科(Veneridae)10个亚科、17个属、20种贝类的16S rRNA基因片段进行了系统学分析, 上述动物的16S rRNA片段长度在438—648bp之间, 利用PAUP软件包在对序列比对基础上构建了邻接系统树(NJ)和最大拟然系统树(ML)。16S rRNA数据显示, 我国帘蛤科贝类由三个主要分支组成, 美女蛤亚科中的加夫蛤属(Gafrarium)可能是一个单型属, 该属与美女蛤属合并为加夫蛤属比较恰当。帘蛤亚科与雪蛤亚科应属于不连续的分类单元。另外, 青蛤亚科与仙女蛤亚科均应作为独立的亚科存在。本文的研究结论与修订后的帘蛤科形态分类观点一致。 相似文献