Acorn barnacles are important model species in researches on intertidal ecology, larval development and biofouling. At present, with the development of mitochondrial genomics, it is helpful to understand the phylogene...Acorn barnacles are important model species in researches on intertidal ecology, larval development and biofouling. At present, with the development of mitochondrial genomics, it is helpful to understand the phylogenetic relationship from the mitogenomic level. The complete mitochondrial genome of Chthamalus challengeri was presented. The genome is a circular molecule of 15 358 bp. Compared with other species in Balanomorpha, the non-coding region is longer, while the length of the genes is similar to the other species. The overall A+T content of the mitochondrial genome of C. challengeri is 70.5%. There are variations of initiation and stop codons in the known Balanomorpha mitochondrial genomes. The C. challengeri and C. antennatus within the same genus share the identical gene arrangement. However, the gene arrangement of different genera in Chthamalidae is different, as there is a translocation between two tRNA genes and an inversion involving a large gene block. In particular, both srRNA and lrRNA of the two species in Chthamalus are encoded in the heavy strand, differing from the former Balanomorpha species. The topology and gene arrangement in Chthamalidae support each other. Phylogenetic analysis indicates that the Chthamalidae is monophyletic, while the Balanidae and Archaeobalanidae are polyphyletic.展开更多
Extensive barnacle coquinas(barnamols)formed around New Zealand’s North and Chatham Islands during the late Pliocene to early Pleistocene.The inner-shelf megabalanine Fosterella is the primary constituent of these li...Extensive barnacle coquinas(barnamols)formed around New Zealand’s North and Chatham Islands during the late Pliocene to early Pleistocene.The inner-shelf megabalanine Fosterella is the primary constituent of these lithofacies,which also include epifaunal bivalves,bryozoans and less modified balanids like Notobalanus and Notomegabalanus.The status of genus Fosterella is reviewed,3 species are retained and a new genus,Porobalanus,is proposed for Fosterella hennigi,a species restricted to the Early Pliocene of Cockburn Island,Antarctica.Significantly,Fosterella did not survive the New Zealand Pleistocene,although Notobalanus and Notomegabalanus,which have fossil records extending back to the Early Miocene,remain important components of present day cool-temperate Southern Hemisphere faunas.Extinction of Fosterella,in shelf waters off Argentina,is explained through a combination of changing circulatory and sedimentary regimes,competition for food and space,predation and physiological constraints.The driver of these factors was rapid regional cooling.展开更多
基金The National Natural Science Foundation of China(NSFC)under contract No.41876147the Jiangsu Priority Academic Program Development(PAPD)+3 种基金the Graduate Research and Innovation Projects under contract Nos KYCX18_2570 and KYCX18_2566Jiangsu QinglanJiangsu 333Jiangsu Six Talent Peaks and Lianyungang 521 Talent Projects
文摘Acorn barnacles are important model species in researches on intertidal ecology, larval development and biofouling. At present, with the development of mitochondrial genomics, it is helpful to understand the phylogenetic relationship from the mitogenomic level. The complete mitochondrial genome of Chthamalus challengeri was presented. The genome is a circular molecule of 15 358 bp. Compared with other species in Balanomorpha, the non-coding region is longer, while the length of the genes is similar to the other species. The overall A+T content of the mitochondrial genome of C. challengeri is 70.5%. There are variations of initiation and stop codons in the known Balanomorpha mitochondrial genomes. The C. challengeri and C. antennatus within the same genus share the identical gene arrangement. However, the gene arrangement of different genera in Chthamalidae is different, as there is a translocation between two tRNA genes and an inversion involving a large gene block. In particular, both srRNA and lrRNA of the two species in Chthamalus are encoded in the heavy strand, differing from the former Balanomorpha species. The topology and gene arrangement in Chthamalidae support each other. Phylogenetic analysis indicates that the Chthamalidae is monophyletic, while the Balanidae and Archaeobalanidae are polyphyletic.
基金The author thanks Alan Beu and Hamish Campbell(GNS Science,Lower Hutt,New Zealand)for helpful comments about the Te Aute limestones and the Chatham Islands stratigraphyCam Nelson(University of Waikato,Hamilton,New Zealand)provided information on the sedimentology of the Te Aute limestones+1 种基金Jim Carlton(Williams College,CT,USA)sparked my interest in bio-invasionsBob Carter(Townsville,Queensland,Australia)and Lionel Carter(Antarctic Research Centre,Victoria University of Wellington,New Zealand)provided data on late Cainozoic paleooceanography and Bill Newman(Scripps Institute of Oceanography,La Jolla,CA,USA)gave thoughtful comments and provided the thin section of Fosterella tubulatoides.
文摘Extensive barnacle coquinas(barnamols)formed around New Zealand’s North and Chatham Islands during the late Pliocene to early Pleistocene.The inner-shelf megabalanine Fosterella is the primary constituent of these lithofacies,which also include epifaunal bivalves,bryozoans and less modified balanids like Notobalanus and Notomegabalanus.The status of genus Fosterella is reviewed,3 species are retained and a new genus,Porobalanus,is proposed for Fosterella hennigi,a species restricted to the Early Pliocene of Cockburn Island,Antarctica.Significantly,Fosterella did not survive the New Zealand Pleistocene,although Notobalanus and Notomegabalanus,which have fossil records extending back to the Early Miocene,remain important components of present day cool-temperate Southern Hemisphere faunas.Extinction of Fosterella,in shelf waters off Argentina,is explained through a combination of changing circulatory and sedimentary regimes,competition for food and space,predation and physiological constraints.The driver of these factors was rapid regional cooling.
