Knowledge of complete mitochondrial genomes(mitogenomes)can help understand the molecular evolution and phylogenetic relationships of various species.To date,the phylogenetic status of Leucosiidae within Brachyura rem...Knowledge of complete mitochondrial genomes(mitogenomes)can help understand the molecular evolution and phylogenetic relationships of various species.To date,the phylogenetic status of Leucosiidae within Brachyura remains unresolved because of the limited number of mitogenomes available.In the present study,the complete mitogenome of Myra affinis was sequenced using next-generation sequencing to supplement the limited mitogenome information of Leucosiidae.The 15349 bp-long mitogenome includes 13 protein-coding genes(PCGs),22 transfer RNAs(tRNAs),2 ribosomal RNAs(rRNAs),and a putative control region.The overall base composition is 34.5%A,36.1%T,11.5%G,and 17.9%C,with a high AT bias(70.6%).All 13 PCGs start with the standard ATN codon and stop with the TAN codon or incomplete T.Except for tRNA-Ser,all other tRNAs have a typical cloverleaf-like secondary structure.Phylogenetic analyses based on the maximum likelihood and Bayesian inference methods are employed to generate identical phylogenetic topologies,thereby supporting the sister relationship between Leucosiidae and Matutidae for the first time.The monophyly of Eubrachyura is well established,and its sister relationship with Raninoida is strongly supported.The results of this work will not only help achieve a better understanding of the characteristics of the M.affinis mitogenome and the phylogenetic position of Leucosiidae,but also provide relevant information for further studies on the phylogeny of Brachyura.展开更多
This paper reports the occurrence of a marine brachyuran crab species Eucrate alcocki Serene, in Serene et al., 1973, of the family Euryplacidae Stimpson, 1871, for first time from India, based on a male specimen from...This paper reports the occurrence of a marine brachyuran crab species Eucrate alcocki Serene, in Serene 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.展开更多
A new species of goneplacid crab, Paragoneplax chenae, is described, based on collections from the Nansha Islands, South China Sea. P. chenae closely resembles its only congener P. serenei (Zarenkov, 1972) in general ...A new species of goneplacid crab, Paragoneplax chenae, is described, based on collections from the Nansha Islands, South China Sea. P. chenae closely resembles its only congener P. serenei (Zarenkov, 1972) in general appearance. They are distinguishable from each other by the male abdominal and gonopodal characters.展开更多
Raninoides longifrons 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 t...Raninoides longifrons 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.展开更多
基金supported by the Natural Science Foundation of Zhejiang Province (No. LY21C190007)the Zhoushan Science and Technology Bureau (No. 2021C21 007)
文摘Knowledge of complete mitochondrial genomes(mitogenomes)can help understand the molecular evolution and phylogenetic relationships of various species.To date,the phylogenetic status of Leucosiidae within Brachyura remains unresolved because of the limited number of mitogenomes available.In the present study,the complete mitogenome of Myra affinis was sequenced using next-generation sequencing to supplement the limited mitogenome information of Leucosiidae.The 15349 bp-long mitogenome includes 13 protein-coding genes(PCGs),22 transfer RNAs(tRNAs),2 ribosomal RNAs(rRNAs),and a putative control region.The overall base composition is 34.5%A,36.1%T,11.5%G,and 17.9%C,with a high AT bias(70.6%).All 13 PCGs start with the standard ATN codon and stop with the TAN codon or incomplete T.Except for tRNA-Ser,all other tRNAs have a typical cloverleaf-like secondary structure.Phylogenetic analyses based on the maximum likelihood and Bayesian inference methods are employed to generate identical phylogenetic topologies,thereby supporting the sister relationship between Leucosiidae and Matutidae for the first time.The monophyly of Eubrachyura is well established,and its sister relationship with Raninoida is strongly supported.The results of this work will not only help achieve a better understanding of the characteristics of the M.affinis mitogenome and the phylogenetic position of Leucosiidae,but also provide relevant information for further studies on the phylogeny of Brachyura.
基金Supported by the Knowledge Innovation Program of Chinese Academy of Sciences (Nos.KZCX2-YW-213,and O72715)
文摘This paper reports the occurrence of a marine brachyuran crab species Eucrate alcocki Serene, in Serene 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.
基金Supported by the Ministry of Science and Technology of China (No.2006FY110500)
文摘A new species of goneplacid crab, Paragoneplax chenae, is described, based on collections from the Nansha Islands, South China Sea. P. chenae closely resembles its only congener P. serenei (Zarenkov, 1972) in general appearance. They are distinguishable from each other by the male abdominal and gonopodal characters.
文摘Raninoides longifrons 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.
